/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_two_index_05.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:47:45,159 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:47:45,162 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:47:45,181 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:47:45,182 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:47:45,184 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:47:45,186 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:47:45,192 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:47:45,194 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:47:45,197 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:47:45,199 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:47:45,201 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:47:45,202 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:47:45,205 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:47:45,207 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:47:45,209 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:47:45,211 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:47:45,213 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:47:45,215 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:47:45,220 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:47:45,224 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:47:45,227 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:47:45,230 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:47:45,231 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:47:45,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:47:45,238 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:47:45,240 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:47:45,241 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:47:45,242 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:47:45,244 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:47:45,244 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:47:45,245 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:47:45,245 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:47:45,245 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:47:45,246 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:47:45,246 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:47:45,247 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 18:47:45,266 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:47:45,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:47:45,268 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:47:45,268 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:47:45,268 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:47:45,269 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:47:45,269 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:47:45,269 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:47:45,269 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:47:45,269 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:47:45,270 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:47:45,271 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:47:45,271 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:47:45,271 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:47:45,272 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:47:45,272 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:47:45,272 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:47:45,272 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:47:45,272 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:47:45,273 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:47:45,273 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:47:45,273 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:47:45,273 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:47:45,273 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:47:45,274 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:47:45,274 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:47:45,274 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:47:45,274 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:47:45,274 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:47:45,554 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:47:45,573 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:47:45,577 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:47:45,578 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:47:45,579 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:47:45,579 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_05.i [2019-11-06 18:47:45,657 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/815a2e943/b52b4ee8290544339f98279341646438/FLAGd98bb7d25 [2019-11-06 18:47:46,154 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:47:46,154 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_05.i [2019-11-06 18:47:46,161 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/815a2e943/b52b4ee8290544339f98279341646438/FLAGd98bb7d25 [2019-11-06 18:47:46,507 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/815a2e943/b52b4ee8290544339f98279341646438 [2019-11-06 18:47:46,515 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:47:46,517 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:47:46,520 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:46,520 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:47:46,525 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:47:46,526 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,529 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69ab021a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46, skipping insertion in model container [2019-11-06 18:47:46,529 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,538 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:47:46,561 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:47:46,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:46,747 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:47:46,768 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:46,787 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:47:46,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46 WrapperNode [2019-11-06 18:47:46,788 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:46,789 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:47:46,789 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:47:46,789 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:47:46,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,883 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,883 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,897 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (1/1) ... [2019-11-06 18:47:46,899 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:47:46,900 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:47:46,900 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:47:46,900 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:47:46,901 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (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 18:47:46,963 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:47:46,963 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:47:46,963 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:47:46,963 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:47:46,964 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:47:46,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:47:46,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:47:46,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:47:47,237 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:47:47,237 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:47:47,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:47 BoogieIcfgContainer [2019-11-06 18:47:47,239 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:47:47,246 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:47:47,246 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:47:47,250 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:47:47,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:47:46" (1/3) ... [2019-11-06 18:47:47,251 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@312fd49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:47, skipping insertion in model container [2019-11-06 18:47:47,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:46" (2/3) ... [2019-11-06 18:47:47,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@312fd49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:47, skipping insertion in model container [2019-11-06 18:47:47,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:47" (3/3) ... [2019-11-06 18:47:47,259 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_05.i [2019-11-06 18:47:47,269 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:47:47,276 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:47:47,287 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:47:47,313 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:47:47,313 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:47:47,313 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:47:47,313 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:47:47,314 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:47:47,314 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:47:47,314 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:47:47,314 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:47:47,330 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-11-06 18:47:47,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:47:47,335 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:47,336 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:47,338 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:47,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:47,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2019-11-06 18:47:47,350 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:47,350 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714154540] [2019-11-06 18:47:47,350 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:47,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,518 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 18:47:47,519 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714154540] [2019-11-06 18:47:47,519 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:47,520 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:47:47,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685009335] [2019-11-06 18:47:47,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:47:47,525 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:47,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:47:47,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:47:47,543 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2019-11-06 18:47:47,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:47,636 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-11-06 18:47:47,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:47:47,638 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:47:47,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:47,648 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:47:47,648 INFO L226 Difference]: Without dead ends: 19 [2019-11-06 18:47:47,652 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 18:47:47,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-06 18:47:47,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-06 18:47:47,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 18:47:47,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-06 18:47:47,689 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-11-06 18:47:47,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:47,690 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-06 18:47:47,690 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:47:47,690 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-06 18:47:47,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:47:47,691 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:47,691 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:47,692 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:47,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:47,692 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2019-11-06 18:47:47,693 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:47,693 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995289829] [2019-11-06 18:47:47,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:47,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,788 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 18:47:47,789 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995289829] [2019-11-06 18:47:47,789 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:47,790 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:47,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021075618] [2019-11-06 18:47:47,791 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:47,792 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:47,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:47,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:47,793 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-11-06 18:47:47,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:47,886 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-11-06 18:47:47,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:47,887 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:47:47,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:47,888 INFO L225 Difference]: With dead ends: 32 [2019-11-06 18:47:47,888 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 18:47:47,889 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 18:47:47,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 18:47:47,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-06 18:47:47,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 18:47:47,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-06 18:47:47,896 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-11-06 18:47:47,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:47,897 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-06 18:47:47,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:47,897 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-06 18:47:47,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:47:47,898 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:47,898 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:47,898 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:47,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:47,899 INFO L82 PathProgramCache]: Analyzing trace with hash -764882998, now seen corresponding path program 1 times [2019-11-06 18:47:47,899 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:47,899 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573142199] [2019-11-06 18:47:47,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:47,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:47,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:47:47,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573142199] [2019-11-06 18:47:47,980 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:47,983 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:47,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453812819] [2019-11-06 18:47:47,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:47,984 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:47,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:47,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:47,988 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2019-11-06 18:47:48,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:48,080 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2019-11-06 18:47:48,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:48,081 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-11-06 18:47:48,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:48,085 INFO L225 Difference]: With dead ends: 34 [2019-11-06 18:47:48,086 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:47:48,086 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 18:47:48,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:47:48,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-11-06 18:47:48,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 18:47:48,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-06 18:47:48,097 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2019-11-06 18:47:48,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:48,098 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-06 18:47:48,098 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:48,098 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-06 18:47:48,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:47:48,099 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:48,099 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:48,100 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:48,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:48,100 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2019-11-06 18:47:48,100 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:48,100 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636006163] [2019-11-06 18:47:48,101 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:48,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:48,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:48,224 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 18:47:48,224 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636006163] [2019-11-06 18:47:48,224 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981040146] [2019-11-06 18:47:48,224 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 18:47:48,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:48,296 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:47:48,305 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:48,358 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 18:47:48,358 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:48,359 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-11-06 18:47:48,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988040280] [2019-11-06 18:47:48,359 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:47:48,360 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:48,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:47:48,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:48,361 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2019-11-06 18:47:48,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:48,499 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2019-11-06 18:47:48,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:47:48,500 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2019-11-06 18:47:48,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:48,501 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:47:48,501 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:47:48,502 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:48,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:47:48,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2019-11-06 18:47:48,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:47:48,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-06 18:47:48,509 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-06 18:47:48,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:48,509 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-06 18:47:48,510 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:47:48,510 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-06 18:47:48,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:47:48,511 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:48,511 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:48,716 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:48,716 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:48,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:48,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1897825622, now seen corresponding path program 2 times [2019-11-06 18:47:48,717 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:48,717 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218000000] [2019-11-06 18:47:48,718 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:48,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:48,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:48,831 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:47:48,832 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218000000] [2019-11-06 18:47:48,832 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641675643] [2019-11-06 18:47:48,832 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 18:47:48,881 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:48,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:48,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:48,884 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:48,930 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:48,931 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:48,931 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2019-11-06 18:47:48,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724784973] [2019-11-06 18:47:48,932 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:47:48,932 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:48,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:47:48,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:48,933 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2019-11-06 18:47:49,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:49,100 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-11-06 18:47:49,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:47:49,101 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-11-06 18:47:49,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:49,103 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:47:49,103 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:47:49,104 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:49,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:47:49,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2019-11-06 18:47:49,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:47:49,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-06 18:47:49,110 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2019-11-06 18:47:49,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:49,111 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-06 18:47:49,111 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:47:49,111 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-06 18:47:49,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:47:49,112 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:49,112 INFO L410 BasicCegarLoop]: trace histogram [6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:49,317 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:49,318 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:49,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:49,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1456795255, now seen corresponding path program 3 times [2019-11-06 18:47:49,319 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:49,319 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539346460] [2019-11-06 18:47:49,320 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:49,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:49,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:47:49,438 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539346460] [2019-11-06 18:47:49,439 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474782936] [2019-11-06 18:47:49,439 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 18:47:49,493 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:47:49,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:49,495 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:49,498 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:49,518 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:47:49,519 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:49,519 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:47:49,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887864690] [2019-11-06 18:47:49,520 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:47:49,521 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:49,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:47:49,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:49,522 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2019-11-06 18:47:49,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:49,673 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2019-11-06 18:47:49,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:47:49,674 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-11-06 18:47:49,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:49,675 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:47:49,675 INFO L226 Difference]: Without dead ends: 41 [2019-11-06 18:47:49,676 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 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 18:47:49,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-06 18:47:49,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2019-11-06 18:47:49,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:47:49,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-06 18:47:49,689 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-11-06 18:47:49,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:49,690 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-06 18:47:49,690 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:47:49,691 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-06 18:47:49,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:47:49,692 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:49,692 INFO L410 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:49,904 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:49,904 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:49,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:49,905 INFO L82 PathProgramCache]: Analyzing trace with hash -33873434, now seen corresponding path program 4 times [2019-11-06 18:47:49,905 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:49,905 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439534240] [2019-11-06 18:47:49,906 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:49,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:50,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:50,028 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:47:50,028 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439534240] [2019-11-06 18:47:50,028 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270234271] [2019-11-06 18:47:50,028 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 18:47:50,088 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:50,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:50,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:47:50,091 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:50,164 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:47:50,165 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:50,165 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2019-11-06 18:47:50,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229841554] [2019-11-06 18:47:50,166 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:47:50,166 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:50,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:47:50,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=103, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:50,173 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 14 states. [2019-11-06 18:47:50,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:50,333 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2019-11-06 18:47:50,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:47:50,333 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2019-11-06 18:47:50,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:50,334 INFO L225 Difference]: With dead ends: 65 [2019-11-06 18:47:50,334 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:47:50,335 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=79, Invalid=103, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:50,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:47:50,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2019-11-06 18:47:50,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:47:50,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-11-06 18:47:50,344 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 25 [2019-11-06 18:47:50,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:50,345 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-11-06 18:47:50,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:47:50,345 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-11-06 18:47:50,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 18:47:50,346 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:50,346 INFO L410 BasicCegarLoop]: trace histogram [10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:50,549 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:50,550 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:50,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:50,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1963168809, now seen corresponding path program 5 times [2019-11-06 18:47:50,551 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:50,552 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354038540] [2019-11-06 18:47:50,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:50,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:50,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:50,722 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:50,723 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354038540] [2019-11-06 18:47:50,723 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404209338] [2019-11-06 18:47:50,723 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 18:47:50,904 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 18:47:50,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:50,906 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:47:50,908 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:50,928 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:50,929 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:50,930 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:47:50,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903680559] [2019-11-06 18:47:50,931 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:47:50,931 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:50,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:47:50,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:50,933 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 10 states. [2019-11-06 18:47:51,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:51,097 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2019-11-06 18:47:51,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:47:51,098 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2019-11-06 18:47:51,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:51,100 INFO L225 Difference]: With dead ends: 63 [2019-11-06 18:47:51,100 INFO L226 Difference]: Without dead ends: 53 [2019-11-06 18:47:51,100 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 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 18:47:51,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-06 18:47:51,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 35. [2019-11-06 18:47:51,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:47:51,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-06 18:47:51,107 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2019-11-06 18:47:51,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:51,108 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-06 18:47:51,108 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:47:51,108 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-06 18:47:51,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:47:51,109 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:51,109 INFO L410 BasicCegarLoop]: trace histogram [10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:51,309 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:51,310 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:51,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:51,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1389169850, now seen corresponding path program 6 times [2019-11-06 18:47:51,310 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:51,311 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945650554] [2019-11-06 18:47:51,311 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:51,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,419 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:51,419 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945650554] [2019-11-06 18:47:51,419 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501089447] [2019-11-06 18:47:51,420 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 18:47:51,579 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2019-11-06 18:47:51,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:51,581 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:47:51,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:51,599 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:51,599 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:51,600 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:47:51,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262630386] [2019-11-06 18:47:51,600 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:47:51,601 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:51,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:47:51,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:51,601 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 11 states. [2019-11-06 18:47:51,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:51,774 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2019-11-06 18:47:51,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:47:51,774 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2019-11-06 18:47:51,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:51,776 INFO L225 Difference]: With dead ends: 67 [2019-11-06 18:47:51,776 INFO L226 Difference]: Without dead ends: 57 [2019-11-06 18:47:51,777 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 32 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 18:47:51,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-06 18:47:51,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 36. [2019-11-06 18:47:51,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:47:51,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-06 18:47:51,784 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2019-11-06 18:47:51,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:51,784 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-06 18:47:51,784 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:47:51,784 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-06 18:47:51,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:47:51,785 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:51,785 INFO L410 BasicCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:51,989 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:51,989 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:51,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:51,990 INFO L82 PathProgramCache]: Analyzing trace with hash 2062514121, now seen corresponding path program 7 times [2019-11-06 18:47:51,990 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:51,991 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138417808] [2019-11-06 18:47:51,991 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:52,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,108 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:52,109 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138417808] [2019-11-06 18:47:52,109 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813050065] [2019-11-06 18:47:52,109 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 18:47:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,175 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:47:52,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:52,310 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:47:52,311 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:52,311 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13] total 21 [2019-11-06 18:47:52,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570172714] [2019-11-06 18:47:52,312 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:47:52,312 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:52,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:47:52,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=229, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:47:52,313 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 21 states. [2019-11-06 18:47:52,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:52,575 INFO L93 Difference]: Finished difference Result 87 states and 106 transitions. [2019-11-06 18:47:52,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:47:52,575 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 32 [2019-11-06 18:47:52,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:52,576 INFO L225 Difference]: With dead ends: 87 [2019-11-06 18:47:52,576 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 18:47:52,576 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=191, Invalid=229, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:47:52,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 18:47:52,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 44. [2019-11-06 18:47:52,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:47:52,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-11-06 18:47:52,588 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 32 [2019-11-06 18:47:52,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:52,588 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-11-06 18:47:52,588 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:47:52,588 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-11-06 18:47:52,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:47:52,589 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:52,589 INFO L410 BasicCegarLoop]: trace histogram [17, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:52,792 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:52,793 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:52,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:52,794 INFO L82 PathProgramCache]: Analyzing trace with hash -133392054, now seen corresponding path program 8 times [2019-11-06 18:47:52,794 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:52,794 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859393838] [2019-11-06 18:47:52,795 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:52,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,933 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:47:52,934 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859393838] [2019-11-06 18:47:52,934 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132741764] [2019-11-06 18:47:52,934 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 18:47:52,988 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:52,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:52,989 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:47:52,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:53,129 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:47:53,129 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:53,129 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 20] total 27 [2019-11-06 18:47:53,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665568447] [2019-11-06 18:47:53,130 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:47:53,130 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:53,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:47:53,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:47:53,131 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 27 states. [2019-11-06 18:47:53,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:53,434 INFO L93 Difference]: Finished difference Result 98 states and 117 transitions. [2019-11-06 18:47:53,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:47:53,435 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 40 [2019-11-06 18:47:53,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:53,435 INFO L225 Difference]: With dead ends: 98 [2019-11-06 18:47:53,435 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 18:47:53,436 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:47:53,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 18:47:53,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2019-11-06 18:47:53,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 18:47:53,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-11-06 18:47:53,450 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 40 [2019-11-06 18:47:53,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:53,451 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-11-06 18:47:53,451 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:47:53,451 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-11-06 18:47:53,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:47:53,452 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:53,452 INFO L410 BasicCegarLoop]: trace histogram [23, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:53,656 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:53,656 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:53,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:53,657 INFO L82 PathProgramCache]: Analyzing trace with hash 512417733, now seen corresponding path program 9 times [2019-11-06 18:47:53,657 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:53,657 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745920587] [2019-11-06 18:47:53,657 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:53,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:53,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 18:47:53,808 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745920587] [2019-11-06 18:47:53,808 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290834684] [2019-11-06 18:47:53,809 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 18:47:54,338 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:47:54,338 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:54,340 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:47:54,343 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:54,372 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 18:47:54,373 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:54,373 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:47:54,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19285238] [2019-11-06 18:47:54,374 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:47:54,374 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:54,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:47:54,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:54,375 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 14 states. [2019-11-06 18:47:54,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:54,598 INFO L93 Difference]: Finished difference Result 92 states and 105 transitions. [2019-11-06 18:47:54,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:47:54,599 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2019-11-06 18:47:54,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:54,601 INFO L225 Difference]: With dead ends: 92 [2019-11-06 18:47:54,601 INFO L226 Difference]: Without dead ends: 82 [2019-11-06 18:47:54,603 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:54,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-06 18:47:54,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 52. [2019-11-06 18:47:54,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:47:54,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-06 18:47:54,615 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2019-11-06 18:47:54,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:54,616 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-06 18:47:54,620 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:47:54,620 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-06 18:47:54,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:47:54,621 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:54,621 INFO L410 BasicCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:54,822 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:54,822 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:54,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:54,823 INFO L82 PathProgramCache]: Analyzing trace with hash 882187050, now seen corresponding path program 10 times [2019-11-06 18:47:54,823 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:54,824 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296836918] [2019-11-06 18:47:54,824 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:54,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,978 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 18:47:54,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296836918] [2019-11-06 18:47:54,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778165242] [2019-11-06 18:47:54,979 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 18:47:55,064 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:55,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:55,066 INFO L256 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 18:47:55,069 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:55,301 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:47:55,301 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:55,301 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 26] total 34 [2019-11-06 18:47:55,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139424017] [2019-11-06 18:47:55,302 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 18:47:55,302 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:55,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 18:47:55,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:47:55,303 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 34 states. [2019-11-06 18:47:55,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:55,624 INFO L93 Difference]: Finished difference Result 115 states and 137 transitions. [2019-11-06 18:47:55,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 18:47:55,625 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 48 [2019-11-06 18:47:55,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:55,626 INFO L225 Difference]: With dead ends: 115 [2019-11-06 18:47:55,626 INFO L226 Difference]: Without dead ends: 93 [2019-11-06 18:47:55,627 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:47:55,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-11-06 18:47:55,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 60. [2019-11-06 18:47:55,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:47:55,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-11-06 18:47:55,635 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 48 [2019-11-06 18:47:55,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:55,636 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-11-06 18:47:55,636 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 18:47:55,636 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-11-06 18:47:55,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 18:47:55,637 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:55,637 INFO L410 BasicCegarLoop]: trace histogram [30, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:55,845 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:55,845 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:55,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:55,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1562614281, now seen corresponding path program 11 times [2019-11-06 18:47:55,846 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:55,846 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654346474] [2019-11-06 18:47:55,846 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:55,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,005 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-11-06 18:47:56,005 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654346474] [2019-11-06 18:47:56,005 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800385674] [2019-11-06 18:47:56,006 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