/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/loop-acceleration/array_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:20:07,191 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:20:07,194 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:20:07,210 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:20:07,210 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:20:07,211 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:20:07,213 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:20:07,214 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:20:07,216 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:20:07,217 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:20:07,218 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:20:07,219 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:20:07,219 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:20:07,220 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:20:07,221 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:20:07,222 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:20:07,223 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:20:07,224 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:20:07,226 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:20:07,229 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:20:07,230 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:20:07,233 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:20:07,234 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:20:07,235 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:20:07,237 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:20:07,245 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 21:20:07,246 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 21:20:07,247 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 21:20:07,247 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 21:20:07,249 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 21:20:07,252 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 21:20:07,253 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 21:20:07,253 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 21:20:07,253 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:20:07,254 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:20:07,255 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:20:07,256 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 21:20:07,269 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:20:07,269 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:20:07,271 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:20:07,271 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:20:07,271 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:20:07,271 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:20:07,272 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:20:07,272 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:20:07,272 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:20:07,272 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:20:07,272 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:20:07,273 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:20:07,273 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:20:07,275 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:20:07,275 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:20:07,275 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:20:07,275 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:20:07,275 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:20:07,276 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:20:07,276 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:20:07,276 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:20:07,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:20:07,276 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:20:07,277 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:20:07,277 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:20:07,277 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:20:07,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:20:07,277 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:20:07,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:20:07,541 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:20:07,562 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:20:07,565 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:20:07,567 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:20:07,567 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:20:07,568 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-1.c [2019-11-06 21:20:07,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/797f3bfdf/f857c2dbf33447338e48d382b7a8b794/FLAG97c90c259 [2019-11-06 21:20:08,095 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:20:08,096 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-1.c [2019-11-06 21:20:08,102 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/797f3bfdf/f857c2dbf33447338e48d382b7a8b794/FLAG97c90c259 [2019-11-06 21:20:08,491 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/797f3bfdf/f857c2dbf33447338e48d382b7a8b794 [2019-11-06 21:20:08,500 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:20:08,501 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:20:08,502 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:08,502 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:20:08,506 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:20:08,507 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,510 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fd4c054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08, skipping insertion in model container [2019-11-06 21:20:08,510 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,517 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:20:08,533 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:20:08,715 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:08,727 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:20:08,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:08,764 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:20:08,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08 WrapperNode [2019-11-06 21:20:08,765 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:08,765 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:20:08,766 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:20:08,766 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:20:08,851 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,852 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,857 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,858 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,863 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,867 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (1/1) ... [2019-11-06 21:20:08,869 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:20:08,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:20:08,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:20:08,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:20:08,871 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (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 21:20:08,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:20:08,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:20:08,922 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:20:08,922 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:20:08,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:20:08,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:20:08,922 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:20:08,922 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 21:20:08,923 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 21:20:08,923 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 21:20:08,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 21:20:08,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:20:08,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:20:09,101 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:20:09,102 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:20:09,103 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:09 BoogieIcfgContainer [2019-11-06 21:20:09,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:20:09,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:20:09,105 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:20:09,108 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:20:09,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:20:08" (1/3) ... [2019-11-06 21:20:09,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f46e2ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:09, skipping insertion in model container [2019-11-06 21:20:09,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:08" (2/3) ... [2019-11-06 21:20:09,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f46e2ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:09, skipping insertion in model container [2019-11-06 21:20:09,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:09" (3/3) ... [2019-11-06 21:20:09,115 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-1.c [2019-11-06 21:20:09,138 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:20:09,164 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:20:09,192 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:20:09,233 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:20:09,233 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:20:09,233 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:20:09,234 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:20:09,234 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:20:09,234 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:20:09,234 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:20:09,234 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:20:09,253 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-06 21:20:09,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:09,257 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:09,258 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:09,260 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:09,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:09,266 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2019-11-06 21:20:09,273 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:09,273 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299724870] [2019-11-06 21:20:09,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:09,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,426 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 21:20:09,427 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299724870] [2019-11-06 21:20:09,428 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:09,428 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:09,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709840236] [2019-11-06 21:20:09,433 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:09,434 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:09,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:09,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:09,451 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-11-06 21:20:09,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:09,533 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-11-06 21:20:09,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:09,535 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-06 21:20:09,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:09,543 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:09,543 INFO L226 Difference]: Without dead ends: 14 [2019-11-06 21:20:09,547 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 21:20:09,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-06 21:20:09,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-06 21:20:09,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-06 21:20:09,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-11-06 21:20:09,586 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-11-06 21:20:09,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:09,587 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-11-06 21:20:09,587 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:09,587 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-11-06 21:20:09,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:09,588 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:09,588 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:09,589 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:09,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:09,590 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2019-11-06 21:20:09,590 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:09,590 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242068518] [2019-11-06 21:20:09,591 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:09,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,685 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 21:20:09,686 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242068518] [2019-11-06 21:20:09,686 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:09,686 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:20:09,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243475634] [2019-11-06 21:20:09,688 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:20:09,689 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:09,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:20:09,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:20:09,690 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2019-11-06 21:20:09,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:09,732 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-11-06 21:20:09,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:20:09,733 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-06 21:20:09,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:09,734 INFO L225 Difference]: With dead ends: 22 [2019-11-06 21:20:09,734 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:20:09,735 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 21:20:09,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:20:09,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-06 21:20:09,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-06 21:20:09,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-06 21:20:09,741 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2019-11-06 21:20:09,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:09,742 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-06 21:20:09,742 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:20:09,742 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-06 21:20:09,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:20:09,743 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:09,743 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:09,743 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:09,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:09,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2019-11-06 21:20:09,744 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:09,744 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010479957] [2019-11-06 21:20:09,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:09,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:09,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010479957] [2019-11-06 21:20:09,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078845657] [2019-11-06 21:20:09,818 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 21:20:09,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:09,864 INFO L256 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:20:09,870 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:09,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:09,907 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:09,907 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 21:20:09,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593994159] [2019-11-06 21:20:09,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:20:09,909 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:09,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:20:09,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:09,909 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2019-11-06 21:20:09,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:09,961 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-11-06 21:20:09,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:20:09,962 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-06 21:20:09,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:09,963 INFO L225 Difference]: With dead ends: 24 [2019-11-06 21:20:09,963 INFO L226 Difference]: Without dead ends: 18 [2019-11-06 21:20:09,964 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 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 21:20:09,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-06 21:20:09,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-11-06 21:20:09,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:20:09,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-06 21:20:09,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-11-06 21:20:09,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:09,969 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-06 21:20:09,969 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:20:09,969 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-06 21:20:09,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 21:20:09,970 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:09,970 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:10,173 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:10,174 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:10,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:10,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2019-11-06 21:20:10,176 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:10,176 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169394591] [2019-11-06 21:20:10,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:10,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:10,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:10,280 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169394591] [2019-11-06 21:20:10,280 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387579820] [2019-11-06 21:20:10,280 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 21:20:10,332 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:10,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:10,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:20:10,337 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:10,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:10,360 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:10,360 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 21:20:10,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843402190] [2019-11-06 21:20:10,361 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:20:10,361 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:10,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:20:10,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:10,362 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-11-06 21:20:10,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:10,417 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2019-11-06 21:20:10,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:20:10,417 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-11-06 21:20:10,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:10,418 INFO L225 Difference]: With dead ends: 26 [2019-11-06 21:20:10,418 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 21:20:10,419 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 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 21:20:10,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 21:20:10,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-06 21:20:10,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 21:20:10,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-11-06 21:20:10,425 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-11-06 21:20:10,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:10,425 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-11-06 21:20:10,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:20:10,425 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-11-06 21:20:10,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 21:20:10,426 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:10,426 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:10,636 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:10,637 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:10,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:10,638 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2019-11-06 21:20:10,638 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:10,638 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119852990] [2019-11-06 21:20:10,639 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:10,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:10,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:10,727 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:10,727 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119852990] [2019-11-06 21:20:10,728 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110461902] [2019-11-06 21:20:10,728 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 21:20:10,781 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:20:10,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:10,782 INFO L256 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:20:10,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:10,798 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:10,798 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:10,799 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 21:20:10,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508338894] [2019-11-06 21:20:10,799 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:20:10,800 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:10,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:20:10,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:10,800 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2019-11-06 21:20:10,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:10,858 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-11-06 21:20:10,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:20:10,860 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-11-06 21:20:10,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:10,861 INFO L225 Difference]: With dead ends: 28 [2019-11-06 21:20:10,861 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 21:20:10,862 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 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 21:20:10,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 21:20:10,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-11-06 21:20:10,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:20:10,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-11-06 21:20:10,867 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2019-11-06 21:20:10,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:10,868 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-11-06 21:20:10,868 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:20:10,868 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-11-06 21:20:10,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:20:10,869 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:10,869 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:11,071 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:11,073 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:11,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:11,073 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2019-11-06 21:20:11,074 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:11,075 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488839795] [2019-11-06 21:20:11,075 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:11,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:11,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:11,171 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:11,171 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488839795] [2019-11-06 21:20:11,171 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428541051] [2019-11-06 21:20:11,171 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 21:20:11,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:11,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:11,210 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:20:11,211 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:11,231 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:11,232 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:11,233 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 21:20:11,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432221335] [2019-11-06 21:20:11,234 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:20:11,240 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:11,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:20:11,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:11,241 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 9 states. [2019-11-06 21:20:11,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:11,305 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-11-06 21:20:11,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:20:11,305 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2019-11-06 21:20:11,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:11,306 INFO L225 Difference]: With dead ends: 30 [2019-11-06 21:20:11,306 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 21:20:11,308 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 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 21:20:11,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 21:20:11,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-06 21:20:11,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 21:20:11,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2019-11-06 21:20:11,316 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2019-11-06 21:20:11,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:11,316 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2019-11-06 21:20:11,316 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:20:11,317 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2019-11-06 21:20:11,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 21:20:11,318 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:11,318 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:11,520 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:11,521 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:11,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:11,522 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2019-11-06 21:20:11,522 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:11,522 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018161852] [2019-11-06 21:20:11,523 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:11,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:11,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:11,643 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:11,643 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018161852] [2019-11-06 21:20:11,643 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065532296] [2019-11-06 21:20:11,644 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 21:20:11,701 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 21:20:11,701 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:11,702 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:20:11,705 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:11,738 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:11,738 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:11,738 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 21:20:11,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746097259] [2019-11-06 21:20:11,740 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:20:11,740 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:11,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:20:11,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:11,742 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 10 states. [2019-11-06 21:20:11,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:11,868 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2019-11-06 21:20:11,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:20:11,869 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2019-11-06 21:20:11,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:11,870 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:20:11,870 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 21:20:11,871 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 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 21:20:11,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 21:20:11,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-11-06 21:20:11,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 21:20:11,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-11-06 21:20:11,881 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2019-11-06 21:20:11,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:11,881 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-11-06 21:20:11,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:20:11,881 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-11-06 21:20:11,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 21:20:11,882 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:11,882 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:12,095 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:12,096 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:12,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:12,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2019-11-06 21:20:12,096 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:12,097 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728656944] [2019-11-06 21:20:12,097 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,206 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,206 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728656944] [2019-11-06 21:20:12,207 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717530980] [2019-11-06 21:20:12,207 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 21:20:12,249 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 21:20:12,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:12,250 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:20:12,252 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:12,268 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,269 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:12,269 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 21:20:12,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52391604] [2019-11-06 21:20:12,270 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:20:12,271 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:12,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:20:12,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:12,274 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 11 states. [2019-11-06 21:20:12,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:12,359 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2019-11-06 21:20:12,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:20:12,360 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2019-11-06 21:20:12,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:12,361 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:12,361 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 21:20:12,361 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 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 21:20:12,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 21:20:12,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 21:20:12,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 21:20:12,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2019-11-06 21:20:12,367 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2019-11-06 21:20:12,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:12,367 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2019-11-06 21:20:12,367 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:20:12,367 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2019-11-06 21:20:12,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:20:12,368 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:12,368 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:12,572 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:12,573 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:12,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:12,574 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2019-11-06 21:20:12,574 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:12,575 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365612340] [2019-11-06 21:20:12,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:12,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,721 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,722 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365612340] [2019-11-06 21:20:12,724 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384116426] [2019-11-06 21:20:12,724 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 21:20:12,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:12,769 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:12,771 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:12,785 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:12,785 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:12,786 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 21:20:12,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730086136] [2019-11-06 21:20:12,786 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 21:20:12,787 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:12,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 21:20:12,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:12,787 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 12 states. [2019-11-06 21:20:12,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:12,849 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-11-06 21:20:12,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:20:12,850 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2019-11-06 21:20:12,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:12,850 INFO L225 Difference]: With dead ends: 36 [2019-11-06 21:20:12,850 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 21:20:12,851 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 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 21:20:12,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 21:20:12,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-11-06 21:20:12,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 21:20:12,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-11-06 21:20:12,857 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2019-11-06 21:20:12,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:12,857 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-11-06 21:20:12,857 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 21:20:12,857 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-11-06 21:20:12,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 21:20:12,858 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:12,858 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:13,067 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:13,068 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:13,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:13,068 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2019-11-06 21:20:13,068 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:13,068 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125193321] [2019-11-06 21:20:13,069 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:13,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,169 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,169 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125193321] [2019-11-06 21:20:13,169 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319805730] [2019-11-06 21:20:13,170 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 21:20:13,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:13,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:13,212 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:20:13,214 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:13,229 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,230 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:13,230 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 21:20:13,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956983925] [2019-11-06 21:20:13,231 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:20:13,231 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:13,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:20:13,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:13,231 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 13 states. [2019-11-06 21:20:13,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:13,307 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2019-11-06 21:20:13,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:20:13,308 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2019-11-06 21:20:13,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:13,309 INFO L225 Difference]: With dead ends: 38 [2019-11-06 21:20:13,309 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 21:20:13,310 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 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 21:20:13,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 21:20:13,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-11-06 21:20:13,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 21:20:13,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-11-06 21:20:13,316 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2019-11-06 21:20:13,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:13,316 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-11-06 21:20:13,316 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:20:13,316 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-11-06 21:20:13,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 21:20:13,317 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:13,317 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:13,520 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:13,521 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:13,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:13,522 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2019-11-06 21:20:13,522 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:13,523 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516583985] [2019-11-06 21:20:13,523 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:13,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:13,628 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,628 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516583985] [2019-11-06 21:20:13,628 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049421190] [2019-11-06 21:20:13,628 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 21:20:13,688 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 21:20:13,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:13,689 INFO L256 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:20:13,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:13,704 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:13,705 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:13,705 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 21:20:13,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258278796] [2019-11-06 21:20:13,706 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 21:20:13,706 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:13,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 21:20:13,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:13,707 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 14 states. [2019-11-06 21:20:13,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:13,816 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2019-11-06 21:20:13,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 21:20:13,816 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-11-06 21:20:13,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:13,817 INFO L225 Difference]: With dead ends: 40 [2019-11-06 21:20:13,817 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 21:20:13,817 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 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 21:20:13,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 21:20:13,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-11-06 21:20:13,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 21:20:13,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-11-06 21:20:13,822 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2019-11-06 21:20:13,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:13,823 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-11-06 21:20:13,823 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 21:20:13,823 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-11-06 21:20:13,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 21:20:13,824 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:13,824 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:14,028 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:14,029 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:14,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:14,029 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2019-11-06 21:20:14,029 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:14,030 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659607124] [2019-11-06 21:20:14,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:14,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659607124] [2019-11-06 21:20:14,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275038865] [2019-11-06 21:20:14,182 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 21:20:14,218 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:14,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:14,219 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 21:20:14,222 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:14,244 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,244 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:14,244 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 21:20:14,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965228500] [2019-11-06 21:20:14,253 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:14,253 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:14,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:14,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:14,255 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 15 states. [2019-11-06 21:20:14,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:14,361 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-11-06 21:20:14,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:20:14,361 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 32 [2019-11-06 21:20:14,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:14,362 INFO L225 Difference]: With dead ends: 42 [2019-11-06 21:20:14,362 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 21:20:14,362 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 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 21:20:14,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 21:20:14,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-11-06 21:20:14,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 21:20:14,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2019-11-06 21:20:14,366 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2019-11-06 21:20:14,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:14,366 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2019-11-06 21:20:14,366 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:14,366 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2019-11-06 21:20:14,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 21:20:14,367 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:14,368 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:14,574 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:14,575 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:14,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:14,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2019-11-06 21:20:14,576 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:14,576 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103462767] [2019-11-06 21:20:14,576 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:14,706 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103462767] [2019-11-06 21:20:14,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154779146] [2019-11-06 21:20:14,707 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 21:20:14,780 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:20:14,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:14,781 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:14,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:14,806 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:14,807 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:14,807 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 21:20:14,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924713744] [2019-11-06 21:20:14,808 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 21:20:14,808 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:14,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 21:20:14,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:14,808 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 16 states. [2019-11-06 21:20:14,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:14,894 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-11-06 21:20:14,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 21:20:14,895 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 34 [2019-11-06 21:20:14,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:14,895 INFO L225 Difference]: With dead ends: 44 [2019-11-06 21:20:14,896 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 21:20:14,896 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 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 21:20:14,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 21:20:14,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-11-06 21:20:14,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 21:20:14,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-11-06 21:20:14,901 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2019-11-06 21:20:14,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:14,901 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-11-06 21:20:14,901 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 21:20:14,901 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-11-06 21:20:14,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 21:20:14,902 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:14,902 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:15,106 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:15,106 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:15,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:15,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2019-11-06 21:20:15,108 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:15,108 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373821297] [2019-11-06 21:20:15,108 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:15,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:15,265 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,265 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373821297] [2019-11-06 21:20:15,265 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635108392] [2019-11-06 21:20:15,266 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 21:20:15,546 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:20:15,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:15,548 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 21:20:15,550 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:15,570 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:15,570 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:15,570 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 21:20:15,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214811477] [2019-11-06 21:20:15,571 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:20:15,571 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:15,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:20:15,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:15,572 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 17 states. [2019-11-06 21:20:15,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:15,665 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2019-11-06 21:20:15,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:20:15,665 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-11-06 21:20:15,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:15,666 INFO L225 Difference]: With dead ends: 46 [2019-11-06 21:20:15,666 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 21:20:15,667 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 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 21:20:15,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 21:20:15,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2019-11-06 21:20:15,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 21:20:15,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2019-11-06 21:20:15,676 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2019-11-06 21:20:15,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:15,677 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2019-11-06 21:20:15,677 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:20:15,677 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2019-11-06 21:20:15,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 21:20:15,681 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:15,681 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:15,884 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:15,885 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:15,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:15,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2019-11-06 21:20:15,885 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:15,886 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936217661] [2019-11-06 21:20:15,886 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:15,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,066 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,067 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936217661] [2019-11-06 21:20:16,067 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101246608] [2019-11-06 21:20:16,067 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 21:20:16,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,112 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:20:16,114 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:16,145 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,145 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:16,145 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 21:20:16,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546451474] [2019-11-06 21:20:16,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:20:16,146 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:20:16,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:16,148 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 18 states. [2019-11-06 21:20:16,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,221 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-11-06 21:20:16,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:20:16,221 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-11-06 21:20:16,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,222 INFO L225 Difference]: With dead ends: 48 [2019-11-06 21:20:16,223 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 21:20:16,224 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 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 21:20:16,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 21:20:16,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-11-06 21:20:16,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 21:20:16,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-11-06 21:20:16,230 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2019-11-06 21:20:16,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,231 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-11-06 21:20:16,231 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:20:16,231 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-11-06 21:20:16,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 21:20:16,232 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,232 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,435 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:16,436 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,436 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2019-11-06 21:20:16,437 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,437 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770124456] [2019-11-06 21:20:16,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,634 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,635 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770124456] [2019-11-06 21:20:16,635 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825324164] [2019-11-06 21:20:16,635 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 21:20:16,677 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:16,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:16,678 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 21:20:16,683 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:16,702 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,703 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:16,703 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 21:20:16,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104103777] [2019-11-06 21:20:16,704 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 21:20:16,704 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 21:20:16,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:16,705 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 19 states. [2019-11-06 21:20:16,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,810 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2019-11-06 21:20:16,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:20:16,810 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 40 [2019-11-06 21:20:16,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,811 INFO L225 Difference]: With dead ends: 50 [2019-11-06 21:20:16,811 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 21:20:16,812 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 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 21:20:16,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 21:20:16,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-11-06 21:20:16,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 21:20:16,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-11-06 21:20:16,818 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2019-11-06 21:20:16,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,818 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-11-06 21:20:16,818 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 21:20:16,818 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-11-06 21:20:16,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 21:20:16,819 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,819 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:17,021 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,021 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:17,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:17,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2019-11-06 21:20:17,022 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:17,023 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757775717] [2019-11-06 21:20:17,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:17,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,381 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757775717] [2019-11-06 21:20:17,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760591185] [2019-11-06 21:20:17,383 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 21:20:17,681 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:20:17,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,682 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,684 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,708 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,708 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,708 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 21:20:17,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518827915] [2019-11-06 21:20:17,709 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:20:17,709 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:20:17,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:17,710 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 20 states. [2019-11-06 21:20:17,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:17,817 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-11-06 21:20:17,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 21:20:17,817 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-06 21:20:17,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:17,819 INFO L225 Difference]: With dead ends: 52 [2019-11-06 21:20:17,819 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 21:20:17,820 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:17,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 21:20:17,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-11-06 21:20:17,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 21:20:17,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2019-11-06 21:20:17,825 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2019-11-06 21:20:17,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:17,826 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2019-11-06 21:20:17,826 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:20:17,826 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2019-11-06 21:20:17,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 21:20:17,827 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:17,827 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:18,037 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,038 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:18,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:18,039 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2019-11-06 21:20:18,039 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:18,039 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128470539] [2019-11-06 21:20:18,039 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,269 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,270 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128470539] [2019-11-06 21:20:18,270 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755247625] [2019-11-06 21:20:18,270 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 21:20:18,316 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:18,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:18,317 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:20:18,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:18,341 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,342 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:18,342 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 21:20:18,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714926134] [2019-11-06 21:20:18,342 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:20:18,343 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:18,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:20:18,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:18,343 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 21 states. [2019-11-06 21:20:18,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:18,456 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-11-06 21:20:18,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:20:18,457 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 44 [2019-11-06 21:20:18,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:18,457 INFO L225 Difference]: With dead ends: 54 [2019-11-06 21:20:18,458 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 21:20:18,458 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 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 21:20:18,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 21:20:18,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-11-06 21:20:18,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 21:20:18,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2019-11-06 21:20:18,463 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2019-11-06 21:20:18,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:18,463 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2019-11-06 21:20:18,464 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:20:18,464 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2019-11-06 21:20:18,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 21:20:18,465 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:18,465 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:18,669 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,669 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:18,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:18,669 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2019-11-06 21:20:18,670 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:18,670 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926950825] [2019-11-06 21:20:18,670 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:18,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,889 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,889 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926950825] [2019-11-06 21:20:18,890 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872151796] [2019-11-06 21:20:18,890 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 21:20:19,064 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 21:20:19,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:19,066 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:20:19,067 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:19,091 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,091 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:19,092 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 21:20:19,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803879099] [2019-11-06 21:20:19,093 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 21:20:19,093 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:19,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 21:20:19,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:19,094 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 22 states. [2019-11-06 21:20:19,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:19,245 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2019-11-06 21:20:19,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:20:19,245 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 46 [2019-11-06 21:20:19,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:19,246 INFO L225 Difference]: With dead ends: 56 [2019-11-06 21:20:19,246 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 21:20:19,246 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 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 21:20:19,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 21:20:19,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-11-06 21:20:19,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 21:20:19,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-11-06 21:20:19,250 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2019-11-06 21:20:19,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:19,250 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-11-06 21:20:19,250 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 21:20:19,250 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-11-06 21:20:19,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 21:20:19,251 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:19,251 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:19,452 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,452 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:19,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:19,453 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2019-11-06 21:20:19,453 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:19,453 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258264836] [2019-11-06 21:20:19,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:19,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,714 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,714 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258264836] [2019-11-06 21:20:19,714 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37053883] [2019-11-06 21:20:19,714 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,299 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:20:20,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:20,301 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 21:20:20,302 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:20,321 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,321 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:20,321 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 21:20:20,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187320203] [2019-11-06 21:20:20,322 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:20:20,322 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:20,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:20:20,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:20,323 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 23 states. [2019-11-06 21:20:20,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:20,458 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2019-11-06 21:20:20,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 21:20:20,459 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-11-06 21:20:20,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:20,460 INFO L225 Difference]: With dead ends: 58 [2019-11-06 21:20:20,460 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 21:20:20,460 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:20,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 21:20:20,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2019-11-06 21:20:20,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 21:20:20,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2019-11-06 21:20:20,465 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2019-11-06 21:20:20,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:20,465 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2019-11-06 21:20:20,465 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:20:20,465 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2019-11-06 21:20:20,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 21:20:20,466 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:20,466 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:20,674 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,674 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:20,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:20,675 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2019-11-06 21:20:20,675 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:20,675 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909036026] [2019-11-06 21:20:20,675 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:20,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,961 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,961 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909036026] [2019-11-06 21:20:20,961 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317225634] [2019-11-06 21:20:20,961 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,031 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:20:21,033 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:21,058 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,059 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:21,059 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 21:20:21,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024551691] [2019-11-06 21:20:21,060 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 21:20:21,060 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 21:20:21,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:21,061 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 24 states. [2019-11-06 21:20:21,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,156 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-11-06 21:20:21,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 21:20:21,157 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 50 [2019-11-06 21:20:21,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,157 INFO L225 Difference]: With dead ends: 60 [2019-11-06 21:20:21,157 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 21:20:21,158 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:21,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 21:20:21,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-11-06 21:20:21,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 21:20:21,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2019-11-06 21:20:21,165 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2019-11-06 21:20:21,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,165 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2019-11-06 21:20:21,165 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 21:20:21,165 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2019-11-06 21:20:21,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 21:20:21,169 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,169 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,374 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,374 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,375 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2019-11-06 21:20:21,375 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,375 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847614204] [2019-11-06 21:20:21,376 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,687 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,687 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847614204] [2019-11-06 21:20:21,688 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873521844] [2019-11-06 21:20:21,688 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,743 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:21,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:21,744 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:20:21,746 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:21,764 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,764 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:21,765 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 21:20:21,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898437832] [2019-11-06 21:20:21,765 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:20:21,765 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:20:21,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:21,766 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 25 states. [2019-11-06 21:20:21,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,938 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2019-11-06 21:20:21,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 21:20:21,941 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 52 [2019-11-06 21:20:21,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,942 INFO L225 Difference]: With dead ends: 62 [2019-11-06 21:20:21,942 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 21:20:21,943 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:21,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 21:20:21,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-11-06 21:20:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:20:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-11-06 21:20:21,947 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2019-11-06 21:20:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,948 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-11-06 21:20:21,948 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:20:21,948 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-11-06 21:20:21,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:20:21,949 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,949 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,154 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,155 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,155 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2019-11-06 21:20:22,156 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,156 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328293240] [2019-11-06 21:20:22,156 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,427 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,428 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328293240] [2019-11-06 21:20:22,428 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714183939] [2019-11-06 21:20:22,428 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,987 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-06 21:20:22,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:22,989 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 21:20:22,990 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,008 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,008 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,009 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-11-06 21:20:23,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443641709] [2019-11-06 21:20:23,009 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 21:20:23,009 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 21:20:23,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:23,010 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 26 states. [2019-11-06 21:20:23,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,082 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2019-11-06 21:20:23,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:20:23,082 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 54 [2019-11-06 21:20:23,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,083 INFO L225 Difference]: With dead ends: 64 [2019-11-06 21:20:23,083 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 21:20:23,084 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:23,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 21:20:23,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2019-11-06 21:20:23,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-06 21:20:23,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-11-06 21:20:23,087 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2019-11-06 21:20:23,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,088 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-11-06 21:20:23,088 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 21:20:23,088 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-11-06 21:20:23,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 21:20:23,089 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,089 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:23,293 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,293 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:23,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:23,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2019-11-06 21:20:23,294 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:23,294 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652534537] [2019-11-06 21:20:23,294 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:23,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,627 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,627 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652534537] [2019-11-06 21:20:23,628 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092917594] [2019-11-06 21:20:23,628 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,699 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:23,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:23,701 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 21:20:23,703 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,730 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,731 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,731 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 21:20:23,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092784893] [2019-11-06 21:20:23,731 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:20:23,732 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:20:23,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:23,732 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 27 states. [2019-11-06 21:20:23,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,872 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-11-06 21:20:23,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:20:23,872 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 56 [2019-11-06 21:20:23,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,873 INFO L225 Difference]: With dead ends: 66 [2019-11-06 21:20:23,873 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 21:20:23,874 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:23,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 21:20:23,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-11-06 21:20:23,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 21:20:23,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2019-11-06 21:20:23,878 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2019-11-06 21:20:23,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,879 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2019-11-06 21:20:23,879 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:20:23,879 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2019-11-06 21:20:23,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 21:20:23,879 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,880 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,083 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,083 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2019-11-06 21:20:24,084 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,084 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317278909] [2019-11-06 21:20:24,084 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,487 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,487 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317278909] [2019-11-06 21:20:24,487 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006248575] [2019-11-06 21:20:24,488 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,800 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 21:20:24,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:24,803 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 21:20:24,804 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:24,822 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,822 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:24,823 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 21:20:24,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914037579] [2019-11-06 21:20:24,823 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:20:24,824 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:24,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:20:24,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:24,824 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 28 states. [2019-11-06 21:20:24,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:24,939 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-11-06 21:20:24,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 21:20:24,939 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 58 [2019-11-06 21:20:24,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:24,940 INFO L225 Difference]: With dead ends: 68 [2019-11-06 21:20:24,940 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 21:20:24,941 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:24,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 21:20:24,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-11-06 21:20:24,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 21:20:24,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-11-06 21:20:24,945 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2019-11-06 21:20:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:24,945 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-11-06 21:20:24,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:20:24,945 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-11-06 21:20:24,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-06 21:20:24,946 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:24,946 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:25,150 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:25,151 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:25,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:25,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2019-11-06 21:20:25,151 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:25,151 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737081143] [2019-11-06 21:20:25,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:25,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,525 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,526 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737081143] [2019-11-06 21:20:25,526 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551996229] [2019-11-06 21:20:25,526 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,125 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 21:20:28,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,130 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,131 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,147 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,147 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,147 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 21:20:28,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932713132] [2019-11-06 21:20:28,149 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:20:28,149 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:20:28,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:28,150 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 29 states. [2019-11-06 21:20:28,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,325 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2019-11-06 21:20:28,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 21:20:28,325 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2019-11-06 21:20:28,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,326 INFO L225 Difference]: With dead ends: 70 [2019-11-06 21:20:28,326 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 21:20:28,327 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:28,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 21:20:28,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-11-06 21:20:28,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 21:20:28,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2019-11-06 21:20:28,329 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2019-11-06 21:20:28,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,330 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2019-11-06 21:20:28,330 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:20:28,330 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2019-11-06 21:20:28,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-11-06 21:20:28,331 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,331 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:28,535 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,536 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:28,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:28,536 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2019-11-06 21:20:28,537 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:28,537 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842543458] [2019-11-06 21:20:28,537 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:28,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,901 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,902 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842543458] [2019-11-06 21:20:28,902 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926450826] [2019-11-06 21:20:28,902 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,966 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,984 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,984 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,984 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 21:20:28,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135108766] [2019-11-06 21:20:28,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:20:28,985 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:20:28,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:28,985 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 30 states. [2019-11-06 21:20:29,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:29,164 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-11-06 21:20:29,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 21:20:29,164 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 62 [2019-11-06 21:20:29,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:29,166 INFO L225 Difference]: With dead ends: 72 [2019-11-06 21:20:29,166 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 21:20:29,167 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:29,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 21:20:29,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 21:20:29,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 21:20:29,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2019-11-06 21:20:29,170 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2019-11-06 21:20:29,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:29,171 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2019-11-06 21:20:29,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:20:29,171 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2019-11-06 21:20:29,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 21:20:29,172 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:29,172 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:29,375 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,375 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:29,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:29,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2019-11-06 21:20:29,376 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:29,376 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084165728] [2019-11-06 21:20:29,377 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:29,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,767 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:29,767 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084165728] [2019-11-06 21:20:29,767 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799048003] [2019-11-06 21:20:29,767 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:29,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:29,841 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 21:20:29,842 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:29,857 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:29,857 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:29,857 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 21:20:29,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052147904] [2019-11-06 21:20:29,858 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:20:29,858 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:29,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:20:29,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:29,859 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 31 states. [2019-11-06 21:20:30,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:30,035 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2019-11-06 21:20:30,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 21:20:30,036 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 64 [2019-11-06 21:20:30,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:30,037 INFO L225 Difference]: With dead ends: 74 [2019-11-06 21:20:30,037 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 21:20:30,038 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:30,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 21:20:30,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-11-06 21:20:30,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 21:20:30,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-11-06 21:20:30,041 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2019-11-06 21:20:30,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:30,041 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-11-06 21:20:30,041 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:20:30,041 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-11-06 21:20:30,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-11-06 21:20:30,041 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:30,042 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:30,242 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:30,242 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:30,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:30,243 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2019-11-06 21:20:30,243 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:30,243 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250322034] [2019-11-06 21:20:30,244 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:30,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:30,644 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:30,645 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250322034] [2019-11-06 21:20:30,645 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970921566] [2019-11-06 21:20:30,645 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,554 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-11-06 21:20:31,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:31,557 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:20:31,558 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:31,575 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:31,575 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:31,575 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2019-11-06 21:20:31,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668006825] [2019-11-06 21:20:31,576 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-06 21:20:31,576 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:31,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-06 21:20:31,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:31,577 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 32 states. [2019-11-06 21:20:31,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:31,709 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-11-06 21:20:31,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:20:31,709 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 66 [2019-11-06 21:20:31,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:31,710 INFO L225 Difference]: With dead ends: 76 [2019-11-06 21:20:31,710 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 21:20:31,711 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:31,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 21:20:31,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-11-06 21:20:31,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-11-06 21:20:31,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2019-11-06 21:20:31,716 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2019-11-06 21:20:31,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:31,716 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2019-11-06 21:20:31,716 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-06 21:20:31,716 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2019-11-06 21:20:31,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-06 21:20:31,717 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:31,717 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:31,923 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,923 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:31,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:31,924 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2019-11-06 21:20:31,924 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:31,925 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334686953] [2019-11-06 21:20:31,925 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:31,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,347 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:32,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334686953] [2019-11-06 21:20:32,348 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53025113] [2019-11-06 21:20:32,348 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:32,414 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:32,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:32,415 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:20:32,417 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:32,433 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:32,434 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:32,434 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 21:20:32,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093080654] [2019-11-06 21:20:32,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:20:32,435 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:32,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:20:32,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:32,436 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 33 states. [2019-11-06 21:20:32,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:32,571 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-11-06 21:20:32,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 21:20:32,571 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 68 [2019-11-06 21:20:32,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:32,572 INFO L225 Difference]: With dead ends: 78 [2019-11-06 21:20:32,572 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 21:20:32,573 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:32,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 21:20:32,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2019-11-06 21:20:32,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 21:20:32,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2019-11-06 21:20:32,577 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2019-11-06 21:20:32,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:32,577 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2019-11-06 21:20:32,577 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:20:32,577 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2019-11-06 21:20:32,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-11-06 21:20:32,578 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:32,578 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:32,778 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:32,779 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:32,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:32,779 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2019-11-06 21:20:32,780 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:32,780 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472749789] [2019-11-06 21:20:32,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,272 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:33,273 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472749789] [2019-11-06 21:20:33,273 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380340382] [2019-11-06 21:20:33,273 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:33,843 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-11-06 21:20:33,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:33,846 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 21:20:33,847 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:33,862 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:33,862 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:33,862 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-11-06 21:20:33,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748841045] [2019-11-06 21:20:33,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:20:33,863 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:33,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:20:33,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:33,864 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 34 states. [2019-11-06 21:20:34,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:34,049 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2019-11-06 21:20:34,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 21:20:34,050 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 70 [2019-11-06 21:20:34,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:34,051 INFO L225 Difference]: With dead ends: 80 [2019-11-06 21:20:34,051 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 21:20:34,052 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:34,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 21:20:34,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-11-06 21:20:34,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 21:20:34,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-11-06 21:20:34,056 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2019-11-06 21:20:34,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:34,056 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-11-06 21:20:34,056 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:20:34,056 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-11-06 21:20:34,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 21:20:34,057 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:34,057 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:34,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:34,262 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:34,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:34,263 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2019-11-06 21:20:34,263 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:34,263 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109706260] [2019-11-06 21:20:34,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:34,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,799 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:34,799 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109706260] [2019-11-06 21:20:34,799 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739933371] [2019-11-06 21:20:34,799 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:47,831 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-11-06 21:20:47,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:47,840 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 21:20:47,841 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:47,862 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:47,862 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:47,862 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 21:20:47,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853905553] [2019-11-06 21:20:47,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 21:20:47,863 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:47,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 21:20:47,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:47,865 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 35 states. [2019-11-06 21:20:48,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:48,149 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2019-11-06 21:20:48,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 21:20:48,150 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 72 [2019-11-06 21:20:48,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:48,151 INFO L225 Difference]: With dead ends: 82 [2019-11-06 21:20:48,151 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 21:20:48,152 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:48,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 21:20:48,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-11-06 21:20:48,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 21:20:48,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2019-11-06 21:20:48,159 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2019-11-06 21:20:48,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:48,160 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2019-11-06 21:20:48,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 21:20:48,160 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2019-11-06 21:20:48,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 21:20:48,161 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:48,161 INFO L410 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:48,370 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:48,371 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:48,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:48,371 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2019-11-06 21:20:48,371 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:48,372 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608318986] [2019-11-06 21:20:48,372 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:48,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:48,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:48,888 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:48,888 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608318986] [2019-11-06 21:20:48,889 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225553118] [2019-11-06 21:20:48,889 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:48,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:48,962 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 21:20:48,963 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:48,999 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:48,999 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:48,999 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 21:20:49,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102070244] [2019-11-06 21:20:49,000 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 21:20:49,000 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:49,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 21:20:49,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:49,001 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 36 states. [2019-11-06 21:20:49,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:49,207 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-11-06 21:20:49,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 21:20:49,208 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2019-11-06 21:20:49,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:49,209 INFO L225 Difference]: With dead ends: 84 [2019-11-06 21:20:49,209 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 21:20:49,210 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:49,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 21:20:49,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-11-06 21:20:49,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-11-06 21:20:49,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2019-11-06 21:20:49,214 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2019-11-06 21:20:49,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:49,214 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2019-11-06 21:20:49,214 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 21:20:49,215 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2019-11-06 21:20:49,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-11-06 21:20:49,215 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:49,215 INFO L410 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:49,418 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:49,419 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:49,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:49,419 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2019-11-06 21:20:49,420 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:49,420 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013530958] [2019-11-06 21:20:49,420 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:49,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:49,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:49,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:49,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013530958] [2019-11-06 21:20:49,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115177228] [2019-11-06 21:20:49,984 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:50,058 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:50,058 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:50,060 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 21:20:50,061 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:50,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:50,076 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:50,076 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 21:20:50,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361446135] [2019-11-06 21:20:50,077 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 21:20:50,077 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:50,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 21:20:50,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:50,078 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 37 states. [2019-11-06 21:20:50,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:50,264 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2019-11-06 21:20:50,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 21:20:50,265 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 76 [2019-11-06 21:20:50,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:50,266 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:20:50,266 INFO L226 Difference]: Without dead ends: 80 [2019-11-06 21:20:50,267 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:50,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-06 21:20:50,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-11-06 21:20:50,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-06 21:20:50,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-11-06 21:20:50,271 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2019-11-06 21:20:50,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:50,271 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-11-06 21:20:50,271 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 21:20:50,271 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-11-06 21:20:50,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-06 21:20:50,272 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:50,272 INFO L410 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:50,475 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:50,475 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:50,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:50,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2019-11-06 21:20:50,476 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:50,476 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85978011] [2019-11-06 21:20:50,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:50,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:51,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:51,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:51,035 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85978011] [2019-11-06 21:20:51,035 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747112910] [2019-11-06 21:20:51,035 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:56,000 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2019-11-06 21:20:56,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:56,004 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-06 21:20:56,005 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:56,022 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:56,022 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2019-11-06 21:20:56,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439185552] [2019-11-06 21:20:56,023 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-06 21:20:56,023 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:56,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-06 21:20:56,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 21:20:56,024 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 38 states. [2019-11-06 21:20:56,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:56,198 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2019-11-06 21:20:56,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-06 21:20:56,199 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 78 [2019-11-06 21:20:56,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:56,200 INFO L225 Difference]: With dead ends: 88 [2019-11-06 21:20:56,200 INFO L226 Difference]: Without dead ends: 82 [2019-11-06 21:20:56,201 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 21:20:56,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-06 21:20:56,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2019-11-06 21:20:56,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-11-06 21:20:56,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2019-11-06 21:20:56,204 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2019-11-06 21:20:56,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:56,204 INFO L462 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2019-11-06 21:20:56,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-06 21:20:56,204 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2019-11-06 21:20:56,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-11-06 21:20:56,205 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:56,205 INFO L410 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:56,411 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:56,412 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:56,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:56,412 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2019-11-06 21:20:56,413 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:56,413 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671104019] [2019-11-06 21:20:56,413 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:56,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:57,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:57,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:57,057 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671104019] [2019-11-06 21:20:57,057 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364431437] [2019-11-06 21:20:57,057 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:57,137 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:57,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:57,139 INFO L256 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 21:20:57,148 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:57,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:57,167 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:57,167 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-11-06 21:20:57,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775811418] [2019-11-06 21:20:57,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-06 21:20:57,167 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:57,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-06 21:20:57,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 21:20:57,168 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 39 states. [2019-11-06 21:20:57,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:57,385 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2019-11-06 21:20:57,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 21:20:57,386 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 80 [2019-11-06 21:20:57,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:57,387 INFO L225 Difference]: With dead ends: 90 [2019-11-06 21:20:57,387 INFO L226 Difference]: Without dead ends: 84 [2019-11-06 21:20:57,388 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-11-06 21:20:57,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-06 21:20:57,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2019-11-06 21:20:57,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-06 21:20:57,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2019-11-06 21:20:57,392 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2019-11-06 21:20:57,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:57,393 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2019-11-06 21:20:57,393 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-06 21:20:57,393 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2019-11-06 21:20:57,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-11-06 21:20:57,393 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:57,394 INFO L410 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:57,597 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:57,597 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:57,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:57,598 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2019-11-06 21:20:57,598 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:57,599 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263075380] [2019-11-06 21:20:57,599 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:57,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat