/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:45:41,132 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:45:41,135 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:45:41,154 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:45:41,155 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:45:41,157 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:45:41,159 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:45:41,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:45:41,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:45:41,170 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:45:41,171 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:45:41,173 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:45:41,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:45:41,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:45:41,176 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:45:41,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:45:41,178 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:45:41,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:45:41,180 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:45:41,182 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:45:41,183 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:45:41,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:45:41,187 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:45:41,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:45:41,191 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:45:41,196 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:45:41,196 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:45:41,200 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:45:41,201 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:45:41,204 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:45:41,205 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:45:41,206 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:45:41,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:45:41,206 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:45:41,207 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:45:41,207 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:45:41,208 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:45:41,230 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:45:41,230 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:45:41,232 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:45:41,232 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:45:41,232 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:45:41,232 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:45:41,232 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:45:41,233 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:45:41,233 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:45:41,233 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:45:41,233 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:45:41,233 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:45:41,234 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:45:41,234 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:45:41,234 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:45:41,234 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:45:41,234 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:45:41,235 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:45:41,235 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:45:41,235 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:45:41,235 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:45:41,235 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:45:41,236 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:45:41,236 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:45:41,236 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:45:41,236 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:45:41,236 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:45:41,237 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:45:41,237 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:45:41,504 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:45:41,522 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:45:41,525 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:45:41,527 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:45:41,527 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:45:41,528 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-06 18:45:41,613 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/957c5753b/7625c46f587446d0be533875e7240617/FLAG40199a1fa [2019-11-06 18:45:42,088 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:45:42,089 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2019-11-06 18:45:42,096 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/957c5753b/7625c46f587446d0be533875e7240617/FLAG40199a1fa [2019-11-06 18:45:42,449 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/957c5753b/7625c46f587446d0be533875e7240617 [2019-11-06 18:45:42,458 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:45:42,460 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:45:42,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:45:42,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:45:42,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:45:42,466 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,468 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b7e0c26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42, skipping insertion in model container [2019-11-06 18:45:42,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,476 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:45:42,492 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:45:42,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:45:42,660 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:45:42,682 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:45:42,697 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:45:42,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42 WrapperNode [2019-11-06 18:45:42,698 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:45:42,698 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:45:42,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:45:42,698 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:45:42,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,809 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,811 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,826 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,827 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... [2019-11-06 18:45:42,829 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:45:42,830 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:45:42,830 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:45:42,830 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:45:42,831 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:45:42,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:45:42,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:45:42,892 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:45:42,892 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:45:42,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:45:42,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:45:42,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:45:42,893 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:45:42,893 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:45:42,894 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:45:42,894 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:45:42,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:45:42,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:45:42,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:45:43,141 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:45:43,141 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:45:43,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:45:43 BoogieIcfgContainer [2019-11-06 18:45:43,143 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:45:43,152 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:45:43,152 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:45:43,155 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:45:43,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:45:42" (1/3) ... [2019-11-06 18:45:43,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d59acda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:45:43, skipping insertion in model container [2019-11-06 18:45:43,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:45:42" (2/3) ... [2019-11-06 18:45:43,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d59acda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:45:43, skipping insertion in model container [2019-11-06 18:45:43,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:45:43" (3/3) ... [2019-11-06 18:45:43,159 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2019-11-06 18:45:43,169 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:45:43,190 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:45:43,199 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:45:43,225 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:45:43,226 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:45:43,226 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:45:43,226 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:45:43,226 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:45:43,226 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:45:43,226 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:45:43,227 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:45:43,247 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:45:43,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:45:43,253 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:43,253 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:43,255 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:43,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:43,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-11-06 18:45:43,266 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:43,267 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196603469] [2019-11-06 18:45:43,267 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:43,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:45:43,429 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196603469] [2019-11-06 18:45:43,430 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:45:43,430 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:45:43,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781970274] [2019-11-06 18:45:43,435 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:45:43,436 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:43,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:45:43,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:45:43,449 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:45:43,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:43,549 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-11-06 18:45:43,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:45:43,551 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:45:43,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:43,560 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:45:43,560 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:45:43,564 INFO L630 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 [2019-11-06 18:45:43,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:45:43,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:45:43,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:45:43,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-11-06 18:45:43,605 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-11-06 18:45:43,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:43,605 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-11-06 18:45:43,606 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:45:43,606 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-11-06 18:45:43,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:45:43,607 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:43,607 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:43,608 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:43,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:43,609 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-11-06 18:45:43,609 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:43,609 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77121288] [2019-11-06 18:45:43,609 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:43,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:45:43,700 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77121288] [2019-11-06 18:45:43,700 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:45:43,700 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:45:43,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753622148] [2019-11-06 18:45:43,703 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:45:43,703 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:43,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:45:43,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:45:43,708 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-11-06 18:45:43,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:43,793 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2019-11-06 18:45:43,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:45:43,794 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:45:43,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:43,795 INFO L225 Difference]: With dead ends: 40 [2019-11-06 18:45:43,795 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:45:43,796 INFO L630 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 [2019-11-06 18:45:43,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:45:43,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2019-11-06 18:45:43,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:45:43,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-06 18:45:43,804 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2019-11-06 18:45:43,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:43,804 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-06 18:45:43,804 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:45:43,805 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-06 18:45:43,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:45:43,805 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:43,806 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:43,806 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:43,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:43,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-11-06 18:45:43,807 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:43,807 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699291062] [2019-11-06 18:45:43,808 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:43,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:45:43,904 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699291062] [2019-11-06 18:45:43,904 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353945174] [2019-11-06 18:45:43,904 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:43,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:43,955 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:45:43,961 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:44,002 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:45:44,003 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:44,003 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:45:44,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131535018] [2019-11-06 18:45:44,005 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:45:44,006 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:44,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:45:44,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:45:44,009 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2019-11-06 18:45:44,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:44,134 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-11-06 18:45:44,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:45:44,136 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-11-06 18:45:44,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:44,137 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:45:44,137 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:45:44,138 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:45:44,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:45:44,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-11-06 18:45:44,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:45:44,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-06 18:45:44,150 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2019-11-06 18:45:44,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:44,151 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-06 18:45:44,151 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:45:44,151 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-06 18:45:44,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:45:44,154 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:44,155 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:44,364 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:44,364 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:44,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:44,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 2 times [2019-11-06 18:45:44,365 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:44,366 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362801872] [2019-11-06 18:45:44,366 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:44,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,472 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:45:44,473 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362801872] [2019-11-06 18:45:44,473 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138206260] [2019-11-06 18:45:44,473 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:44,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:44,533 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:44,534 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:45:44,547 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:44,571 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:45:44,571 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:44,572 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:45:44,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703495019] [2019-11-06 18:45:44,572 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:45:44,573 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:44,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:45:44,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:45:44,573 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 7 states. [2019-11-06 18:45:44,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:44,665 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2019-11-06 18:45:44,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:45:44,665 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 18:45:44,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:44,666 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:45:44,666 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:45:44,667 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:45:44,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:45:44,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-11-06 18:45:44,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:45:44,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-06 18:45:44,673 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2019-11-06 18:45:44,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:44,674 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-06 18:45:44,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:45:44,674 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-06 18:45:44,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:45:44,675 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:44,675 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:44,878 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:44,878 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:44,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:44,879 INFO L82 PathProgramCache]: Analyzing trace with hash -657216102, now seen corresponding path program 3 times [2019-11-06 18:45:44,880 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:44,880 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576919213] [2019-11-06 18:45:44,881 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:44,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:44,955 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:45:44,956 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576919213] [2019-11-06 18:45:44,956 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144114041] [2019-11-06 18:45:44,956 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:45,015 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 18:45:45,016 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:45,017 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:45:45,021 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:45,043 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:45:45,044 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:45,045 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:45:45,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247071695] [2019-11-06 18:45:45,046 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:45:45,046 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:45,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:45:45,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:45:45,047 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2019-11-06 18:45:45,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:45,135 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-11-06 18:45:45,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:45:45,136 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2019-11-06 18:45:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:45,138 INFO L225 Difference]: With dead ends: 57 [2019-11-06 18:45:45,138 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 18:45:45,139 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:45:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 18:45:45,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-11-06 18:45:45,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:45:45,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-06 18:45:45,153 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2019-11-06 18:45:45,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:45,153 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-06 18:45:45,154 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:45:45,155 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-06 18:45:45,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:45:45,156 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:45,156 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:45,359 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:45,360 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:45,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:45,360 INFO L82 PathProgramCache]: Analyzing trace with hash 702132246, now seen corresponding path program 4 times [2019-11-06 18:45:45,360 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:45,361 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404562590] [2019-11-06 18:45:45,361 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:45,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,483 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:45:45,483 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404562590] [2019-11-06 18:45:45,484 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185727893] [2019-11-06 18:45:45,484 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:45,529 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:45:45,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:45,530 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:45:45,532 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:45,547 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:45:45,547 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:45,548 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:45:45,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696400656] [2019-11-06 18:45:45,548 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:45:45,549 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:45,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:45:45,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:45:45,549 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 9 states. [2019-11-06 18:45:45,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:45,657 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-11-06 18:45:45,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:45:45,657 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2019-11-06 18:45:45,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:45,658 INFO L225 Difference]: With dead ends: 63 [2019-11-06 18:45:45,659 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 18:45:45,659 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:45:45,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 18:45:45,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-06 18:45:45,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:45:45,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-11-06 18:45:45,665 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2019-11-06 18:45:45,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:45,665 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-11-06 18:45:45,665 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:45:45,666 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-11-06 18:45:45,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:45:45,667 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:45,667 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:45,869 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:45,870 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:45,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:45,870 INFO L82 PathProgramCache]: Analyzing trace with hash -294189934, now seen corresponding path program 5 times [2019-11-06 18:45:45,870 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:45,870 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602502540] [2019-11-06 18:45:45,871 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:45,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:45,987 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:45:45,987 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602502540] [2019-11-06 18:45:45,988 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375052139] [2019-11-06 18:45:45,988 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:46,112 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 18:45:46,112 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:46,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:45:46,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:46,136 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:45:46,136 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:46,136 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:45:46,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871702586] [2019-11-06 18:45:46,137 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:45:46,138 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:46,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:45:46,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:45:46,138 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 10 states. [2019-11-06 18:45:46,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:46,256 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2019-11-06 18:45:46,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:45:46,256 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2019-11-06 18:45:46,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:46,257 INFO L225 Difference]: With dead ends: 69 [2019-11-06 18:45:46,258 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:45:46,258 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:45:46,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:45:46,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-11-06 18:45:46,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:45:46,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-11-06 18:45:46,265 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2019-11-06 18:45:46,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:46,265 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-11-06 18:45:46,265 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:45:46,265 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-11-06 18:45:46,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:45:46,268 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:46,268 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:46,469 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:46,470 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:46,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:46,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1966517006, now seen corresponding path program 6 times [2019-11-06 18:45:46,471 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:46,471 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175293457] [2019-11-06 18:45:46,471 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:46,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:46,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:46,611 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:45:46,612 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175293457] [2019-11-06 18:45:46,612 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456340701] [2019-11-06 18:45:46,612 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:46,708 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:45:46,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:46,710 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:45:46,713 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:46,727 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:45:46,727 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:46,727 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:45:46,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705578074] [2019-11-06 18:45:46,728 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:45:46,728 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:46,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:45:46,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:45:46,729 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2019-11-06 18:45:46,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:46,869 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2019-11-06 18:45:46,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:45:46,869 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-11-06 18:45:46,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:46,870 INFO L225 Difference]: With dead ends: 75 [2019-11-06 18:45:46,870 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 18:45:46,871 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:45:46,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 18:45:46,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2019-11-06 18:45:46,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:45:46,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-11-06 18:45:46,877 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 39 [2019-11-06 18:45:46,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:46,877 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-11-06 18:45:46,878 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:45:46,878 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-11-06 18:45:46,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:45:46,879 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:46,879 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:47,082 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:47,083 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:47,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:47,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1042523018, now seen corresponding path program 7 times [2019-11-06 18:45:47,084 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:47,084 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830863372] [2019-11-06 18:45:47,085 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:47,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:47,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:47,190 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-06 18:45:47,190 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830863372] [2019-11-06 18:45:47,191 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241223977] [2019-11-06 18:45:47,191 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:47,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:47,239 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:45:47,242 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:47,264 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-06 18:45:47,265 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:47,265 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:45:47,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919148327] [2019-11-06 18:45:47,266 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:45:47,268 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:47,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:45:47,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:45:47,268 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 12 states. [2019-11-06 18:45:47,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:47,395 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2019-11-06 18:45:47,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:45:47,395 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2019-11-06 18:45:47,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:47,396 INFO L225 Difference]: With dead ends: 81 [2019-11-06 18:45:47,396 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:45:47,397 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:45:47,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:45:47,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-11-06 18:45:47,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:45:47,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-06 18:45:47,407 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43 [2019-11-06 18:45:47,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:47,409 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-06 18:45:47,409 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:45:47,409 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-06 18:45:47,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:45:47,412 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:47,412 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:47,612 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:47,613 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:47,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:47,614 INFO L82 PathProgramCache]: Analyzing trace with hash 2059988486, now seen corresponding path program 8 times [2019-11-06 18:45:47,614 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:47,614 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646559681] [2019-11-06 18:45:47,616 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:47,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:47,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:45:47,732 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646559681] [2019-11-06 18:45:47,732 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299066101] [2019-11-06 18:45:47,732 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:47,792 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:47,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:47,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:45:47,800 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:47,825 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:45:47,825 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:47,825 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:45:47,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450851242] [2019-11-06 18:45:47,826 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:45:47,838 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:47,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:45:47,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:45:47,840 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 13 states. [2019-11-06 18:45:47,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:47,972 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2019-11-06 18:45:47,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:45:47,973 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 47 [2019-11-06 18:45:47,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:47,974 INFO L225 Difference]: With dead ends: 87 [2019-11-06 18:45:47,974 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 18:45:47,974 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:45:47,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 18:45:47,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-11-06 18:45:47,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-06 18:45:47,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-11-06 18:45:47,980 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 47 [2019-11-06 18:45:47,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:47,981 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-11-06 18:45:47,981 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:45:47,981 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-11-06 18:45:47,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 18:45:47,982 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:47,982 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:48,191 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:48,191 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:48,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:48,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1909355902, now seen corresponding path program 9 times [2019-11-06 18:45:48,193 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:48,193 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766387116] [2019-11-06 18:45:48,194 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:48,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:48,318 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:45:48,318 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766387116] [2019-11-06 18:45:48,318 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868300967] [2019-11-06 18:45:48,319 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:48,987 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 18:45:48,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:48,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:45:48,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:49,015 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:45:49,016 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:49,016 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:45:49,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369463740] [2019-11-06 18:45:49,016 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:45:49,017 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:49,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:45:49,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:45:49,017 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2019-11-06 18:45:49,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:49,140 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2019-11-06 18:45:49,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:45:49,140 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 51 [2019-11-06 18:45:49,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:49,141 INFO L225 Difference]: With dead ends: 93 [2019-11-06 18:45:49,141 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 18:45:49,142 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:45:49,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 18:45:49,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-11-06 18:45:49,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:45:49,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-11-06 18:45:49,148 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 51 [2019-11-06 18:45:49,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:49,148 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-11-06 18:45:49,148 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:45:49,149 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-11-06 18:45:49,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:45:49,149 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:49,150 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:49,358 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:49,358 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:49,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:49,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1930921730, now seen corresponding path program 10 times [2019-11-06 18:45:49,359 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:49,359 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287690520] [2019-11-06 18:45:49,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:49,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:49,507 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-06 18:45:49,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287690520] [2019-11-06 18:45:49,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994337930] [2019-11-06 18:45:49,507 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:49,566 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:45:49,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:49,567 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:45:49,582 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-06 18:45:49,612 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:49,612 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:45:49,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916301786] [2019-11-06 18:45:49,613 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:45:49,614 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:49,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:45:49,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:45:49,615 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 15 states. [2019-11-06 18:45:49,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:49,792 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2019-11-06 18:45:49,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:45:49,792 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 55 [2019-11-06 18:45:49,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:49,793 INFO L225 Difference]: With dead ends: 99 [2019-11-06 18:45:49,793 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:45:49,794 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:45:49,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:45:49,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-11-06 18:45:49,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-06 18:45:49,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-11-06 18:45:49,800 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55 [2019-11-06 18:45:49,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:49,800 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-11-06 18:45:49,801 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:45:49,801 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-11-06 18:45:49,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:45:49,802 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:49,802 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:50,006 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:50,006 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:50,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:50,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1124550278, now seen corresponding path program 11 times [2019-11-06 18:45:50,007 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:50,008 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334188251] [2019-11-06 18:45:50,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:50,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:50,161 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 18:45:50,161 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334188251] [2019-11-06 18:45:50,161 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924436258] [2019-11-06 18:45:50,162 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:50,816 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 18:45:50,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:50,820 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:45:50,822 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:50,853 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 18:45:50,853 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:50,854 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:45:50,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414577699] [2019-11-06 18:45:50,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:45:50,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:50,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:45:50,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:45:50,855 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 16 states. [2019-11-06 18:45:50,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:50,973 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2019-11-06 18:45:50,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:45:50,974 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 59 [2019-11-06 18:45:50,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:50,975 INFO L225 Difference]: With dead ends: 105 [2019-11-06 18:45:50,975 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 18:45:50,975 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:45:50,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 18:45:50,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-11-06 18:45:50,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-06 18:45:50,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-11-06 18:45:50,987 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 59 [2019-11-06 18:45:50,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:50,987 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-11-06 18:45:50,987 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:45:50,987 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-11-06 18:45:50,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 18:45:50,992 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:50,992 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:51,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:51,193 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:51,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:51,194 INFO L82 PathProgramCache]: Analyzing trace with hash 367873014, now seen corresponding path program 12 times [2019-11-06 18:45:51,194 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:51,195 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128639575] [2019-11-06 18:45:51,195 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:51,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 18:45:51,361 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128639575] [2019-11-06 18:45:51,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325054670] [2019-11-06 18:45:51,362 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:55,005 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:45:55,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:55,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:45:55,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:55,040 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 18:45:55,040 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:55,040 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 18:45:55,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357125041] [2019-11-06 18:45:55,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:45:55,041 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:55,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:45:55,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:45:55,042 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 17 states. [2019-11-06 18:45:55,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:55,191 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2019-11-06 18:45:55,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 18:45:55,191 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 63 [2019-11-06 18:45:55,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:55,192 INFO L225 Difference]: With dead ends: 111 [2019-11-06 18:45:55,192 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 18:45:55,193 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:45:55,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 18:45:55,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-11-06 18:45:55,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-06 18:45:55,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-11-06 18:45:55,199 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 63 [2019-11-06 18:45:55,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:55,200 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-11-06 18:45:55,200 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:45:55,200 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-11-06 18:45:55,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-06 18:45:55,201 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:55,201 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:55,412 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:55,412 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:55,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:55,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1060032398, now seen corresponding path program 13 times [2019-11-06 18:45:55,413 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:55,413 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439446476] [2019-11-06 18:45:55,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:55,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:55,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:55,588 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-06 18:45:55,588 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439446476] [2019-11-06 18:45:55,589 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001310241] [2019-11-06 18:45:55,589 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:55,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:55,644 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:45:55,648 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:55,679 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-11-06 18:45:55,680 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:55,680 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:45:55,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231333974] [2019-11-06 18:45:55,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:45:55,681 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:55,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:45:55,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:45:55,683 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 18 states. [2019-11-06 18:45:55,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:55,856 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-11-06 18:45:55,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:45:55,856 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-11-06 18:45:55,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:55,857 INFO L225 Difference]: With dead ends: 117 [2019-11-06 18:45:55,857 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 18:45:55,858 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:45:55,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 18:45:55,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-11-06 18:45:55,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-06 18:45:55,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-11-06 18:45:55,863 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 67 [2019-11-06 18:45:55,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:55,863 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-11-06 18:45:55,863 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:45:55,864 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-11-06 18:45:55,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-06 18:45:55,864 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:55,865 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:56,068 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:56,068 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:56,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:56,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1741723922, now seen corresponding path program 14 times [2019-11-06 18:45:56,069 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:56,069 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585279476] [2019-11-06 18:45:56,069 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:56,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,252 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-06 18:45:56,252 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585279476] [2019-11-06 18:45:56,252 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233515783] [2019-11-06 18:45:56,252 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:56,315 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:45:56,315 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:45:56,316 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:45:56,317 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:45:56,346 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-11-06 18:45:56,347 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:45:56,347 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:45:56,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941907641] [2019-11-06 18:45:56,348 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:45:56,348 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:45:56,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:45:56,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:45:56,349 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 19 states. [2019-11-06 18:45:56,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:45:56,556 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-11-06 18:45:56,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:45:56,557 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 71 [2019-11-06 18:45:56,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:45:56,558 INFO L225 Difference]: With dead ends: 123 [2019-11-06 18:45:56,558 INFO L226 Difference]: Without dead ends: 82 [2019-11-06 18:45:56,559 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:45:56,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-06 18:45:56,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2019-11-06 18:45:56,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-11-06 18:45:56,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-11-06 18:45:56,564 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 71 [2019-11-06 18:45:56,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:45:56,565 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-11-06 18:45:56,565 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:45:56,565 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-11-06 18:45:56,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-06 18:45:56,566 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:45:56,566 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:45:56,769 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:45:56,769 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:45:56,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:45:56,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1475154070, now seen corresponding path program 15 times [2019-11-06 18:45:56,770 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:45:56,771 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479925802] [2019-11-06 18:45:56,771 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:45:56,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:45:56,972 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 18:45:56,972 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479925802] [2019-11-06 18:45:56,972 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048832233] [2019-11-06 18:45:56,972 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:02,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 18:46:02,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:02,484 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:46:02,486 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:02,509 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 18:46:02,509 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:02,510 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:46:02,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272776462] [2019-11-06 18:46:02,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:46:02,510 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:02,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:46:02,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:46:02,511 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 20 states. [2019-11-06 18:46:02,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:02,680 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-11-06 18:46:02,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:46:02,680 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 75 [2019-11-06 18:46:02,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:02,681 INFO L225 Difference]: With dead ends: 129 [2019-11-06 18:46:02,681 INFO L226 Difference]: Without dead ends: 86 [2019-11-06 18:46:02,682 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:46:02,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-11-06 18:46:02,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2019-11-06 18:46:02,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-06 18:46:02,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2019-11-06 18:46:02,687 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 75 [2019-11-06 18:46:02,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:02,687 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2019-11-06 18:46:02,687 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:46:02,687 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2019-11-06 18:46:02,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 18:46:02,688 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:02,688 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:02,894 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:02,895 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:02,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:02,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1375286810, now seen corresponding path program 16 times [2019-11-06 18:46:02,895 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:02,895 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585337855] [2019-11-06 18:46:02,895 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:02,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:03,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:03,139 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-06 18:46:03,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585337855] [2019-11-06 18:46:03,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580429959] [2019-11-06 18:46:03,140 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:03,204 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:46:03,204 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:03,205 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:46:03,206 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:03,243 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-11-06 18:46:03,243 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:03,243 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:46:03,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171110930] [2019-11-06 18:46:03,244 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:46:03,244 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:03,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:46:03,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:46:03,245 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 21 states. [2019-11-06 18:46:03,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:03,427 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2019-11-06 18:46:03,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:46:03,428 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 79 [2019-11-06 18:46:03,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:03,429 INFO L225 Difference]: With dead ends: 135 [2019-11-06 18:46:03,429 INFO L226 Difference]: Without dead ends: 90 [2019-11-06 18:46:03,430 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:46:03,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-11-06 18:46:03,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-11-06 18:46:03,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-06 18:46:03,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-11-06 18:46:03,435 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 79 [2019-11-06 18:46:03,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:03,435 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-11-06 18:46:03,435 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:46:03,435 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-11-06 18:46:03,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-06 18:46:03,436 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:03,436 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:03,639 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:03,640 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:03,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:03,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1726613918, now seen corresponding path program 17 times [2019-11-06 18:46:03,641 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:03,641 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505964639] [2019-11-06 18:46:03,642 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:03,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:03,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:03,871 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-06 18:46:03,871 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505964639] [2019-11-06 18:46:03,871 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062191656] [2019-11-06 18:46:03,871 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:17,985 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 18:46:17,985 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:46:17,999 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:46:18,001 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:46:18,019 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-11-06 18:46:18,019 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:46:18,019 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:46:18,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886459802] [2019-11-06 18:46:18,020 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:46:18,020 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:46:18,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:46:18,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:46:18,021 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 22 states. [2019-11-06 18:46:18,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:46:18,199 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2019-11-06 18:46:18,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:46:18,200 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 83 [2019-11-06 18:46:18,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:46:18,200 INFO L225 Difference]: With dead ends: 141 [2019-11-06 18:46:18,201 INFO L226 Difference]: Without dead ends: 94 [2019-11-06 18:46:18,201 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:46:18,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-06 18:46:18,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-11-06 18:46:18,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-11-06 18:46:18,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2019-11-06 18:46:18,206 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 83 [2019-11-06 18:46:18,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:46:18,206 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2019-11-06 18:46:18,206 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:46:18,206 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2019-11-06 18:46:18,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-06 18:46:18,207 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:46:18,207 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:46:18,417 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:46:18,417 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:46:18,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:46:18,418 INFO L82 PathProgramCache]: Analyzing trace with hash 164328670, now seen corresponding path program 18 times [2019-11-06 18:46:18,418 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:46:18,419 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270322620] [2019-11-06 18:46:18,419 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:46:18,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:18,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:46:18,630 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-11-06 18:46:18,630 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270322620] [2019-11-06 18:46:18,630 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147621764] [2019-11-06 18:46:18,630 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true