/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:21:29,365 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:21:29,368 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:21:29,404 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:21:29,404 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:21:29,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:21:29,415 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:21:29,419 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:21:29,422 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:21:29,424 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:21:29,427 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:21:29,428 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:21:29,429 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:21:29,432 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:21:29,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:21:29,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:21:29,438 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:21:29,439 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:21:29,440 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:21:29,448 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:21:29,451 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:21:29,452 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:21:29,453 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:21:29,454 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:21:29,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:21:29,467 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:21:29,467 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:21:29,470 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:21:29,470 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:21:29,471 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 17:21:29,471 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 17:21:29,475 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 17:21:29,476 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 17:21:29,477 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 17:21:29,481 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 17:21:29,481 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 17:21:29,482 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 17:21:29,482 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 17:21:29,482 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:21:29,483 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:21:29,484 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:21:29,485 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:21:29,507 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:21:29,507 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:21:29,508 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:21:29,509 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:21:29,509 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:21:29,509 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:21:29,509 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:21:29,510 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:21:29,511 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:21:29,511 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:21:29,511 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:21:29,511 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:21:29,511 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:21:29,512 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:21:29,512 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:21:29,512 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:21:29,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:21:29,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:21:29,513 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:21:29,513 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:21:29,513 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:21:29,513 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:21:29,513 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:21:29,514 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:21:29,514 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:21:29,811 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:21:29,829 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:21:29,836 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:21:29,838 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:21:29,839 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:21:29,840 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 17:21:29,924 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d348d4d4b/bdb706fed7634ba0be78a122d2ecdc7b/FLAGcad5145f9 [2020-08-21 17:21:30,400 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:21:30,401 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 17:21:30,411 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d348d4d4b/bdb706fed7634ba0be78a122d2ecdc7b/FLAGcad5145f9 [2020-08-21 17:21:30,794 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d348d4d4b/bdb706fed7634ba0be78a122d2ecdc7b [2020-08-21 17:21:30,805 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:21:30,807 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:21:30,811 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:21:30,811 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:21:30,815 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:21:30,816 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:21:30" (1/1) ... [2020-08-21 17:21:30,819 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@419c06a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:30, skipping insertion in model container [2020-08-21 17:21:30,819 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:21:30" (1/1) ... [2020-08-21 17:21:30,828 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:21:30,862 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:21:31,059 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:21:31,069 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:21:31,091 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:21:31,190 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:21:31,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31 WrapperNode [2020-08-21 17:21:31,191 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:21:31,191 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:21:31,192 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:21:31,192 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:21:31,202 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,210 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,211 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,219 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,224 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,226 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... [2020-08-21 17:21:31,228 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:21:31,228 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:21:31,229 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:21:31,229 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:21:31,230 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 17:21:31,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:21:31,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:21:31,285 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 17:21:31,285 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:21:31,285 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:21:31,285 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 17:21:31,285 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:21:31,286 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:21:31,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:21:31,574 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:21:31,575 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 17:21:31,579 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:21:31 BoogieIcfgContainer [2020-08-21 17:21:31,579 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:21:31,583 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:21:31,583 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:21:31,586 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:21:31,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:21:30" (1/3) ... [2020-08-21 17:21:31,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d1d533f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:21:31, skipping insertion in model container [2020-08-21 17:21:31,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:21:31" (2/3) ... [2020-08-21 17:21:31,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d1d533f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:21:31, skipping insertion in model container [2020-08-21 17:21:31,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:21:31" (3/3) ... [2020-08-21 17:21:31,591 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 17:21:31,602 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:21:31,610 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:21:31,625 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:21:31,650 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:21:31,650 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:21:31,650 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:21:31,651 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:21:31,651 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:21:31,651 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:21:31,651 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:21:31,651 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:21:31,668 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 17:21:31,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:21:31,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:31,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:31,674 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:31,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:31,681 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 17:21:31,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:31,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632110079] [2020-08-21 17:21:31,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:31,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:31,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:31,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:31,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:21:31,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:31,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:31,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632110079] [2020-08-21 17:21:31,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:21:31,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:21:31,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978983577] [2020-08-21 17:21:31,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:21:31,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:31,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:21:31,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:21:31,909 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 17:21:32,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:32,002 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 17:21:32,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:21:32,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 17:21:32,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:32,015 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:21:32,016 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 17:21:32,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:21:32,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 17:21:32,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 17:21:32,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 17:21:32,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 17:21:32,067 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 17:21:32,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:32,068 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 17:21:32,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:21:32,068 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 17:21:32,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 17:21:32,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:32,070 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:32,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:21:32,070 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:32,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:32,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 17:21:32,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:32,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723582032] [2020-08-21 17:21:32,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:32,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:32,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 17:21:32,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:32,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723582032] [2020-08-21 17:21:32,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:21:32,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:21:32,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378245204] [2020-08-21 17:21:32,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:21:32,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:32,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:21:32,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:21:32,180 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 17:21:32,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:32,244 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 17:21:32,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:21:32,245 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 17:21:32,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:32,246 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:21:32,246 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 17:21:32,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:21:32,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 17:21:32,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 17:21:32,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:21:32,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 17:21:32,257 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 17:21:32,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:32,257 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 17:21:32,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:21:32,258 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 17:21:32,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:21:32,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:32,260 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:32,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:21:32,260 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:32,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:32,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 17:21:32,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:32,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863904429] [2020-08-21 17:21:32,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:32,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:32,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 17:21:32,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:32,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863904429] [2020-08-21 17:21:32,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:32,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 17:21:32,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816014232] [2020-08-21 17:21:32,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:21:32,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:32,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:21:32,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:21:32,372 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 17:21:32,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:32,440 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 17:21:32,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:21:32,441 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 17:21:32,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:32,442 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:21:32,442 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:21:32,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:21:32,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:21:32,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 17:21:32,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:21:32,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 17:21:32,450 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 17:21:32,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:32,450 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 17:21:32,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:21:32,451 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 17:21:32,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:21:32,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:32,452 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:32,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:21:32,452 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:32,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:32,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 17:21:32,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:32,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415378388] [2020-08-21 17:21:32,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:32,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:32,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 17:21:32,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,552 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:32,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415378388] [2020-08-21 17:21:32,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:32,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:21:32,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567954372] [2020-08-21 17:21:32,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:21:32,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:32,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:21:32,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:21:32,555 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 17:21:32,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:32,627 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 17:21:32,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:21:32,628 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 17:21:32,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:32,629 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:21:32,629 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:21:32,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:21:32,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:21:32,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 17:21:32,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 17:21:32,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 17:21:32,637 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 17:21:32,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:32,637 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 17:21:32,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:21:32,637 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 17:21:32,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:21:32,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:32,639 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:32,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:21:32,639 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:32,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:32,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 17:21:32,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:32,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760894542] [2020-08-21 17:21:32,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:32,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 17:21:32,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,748 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:32,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760894542] [2020-08-21 17:21:32,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:32,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:21:32,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111831277] [2020-08-21 17:21:32,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:21:32,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:32,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:21:32,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:21:32,751 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 17:21:32,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:32,814 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 17:21:32,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:21:32,815 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 17:21:32,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:32,816 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:21:32,816 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 17:21:32,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:21:32,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 17:21:32,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 17:21:32,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 17:21:32,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 17:21:32,823 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 17:21:32,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:32,823 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 17:21:32,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:21:32,824 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 17:21:32,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:21:32,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:32,825 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:32,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:21:32,825 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:32,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:32,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 17:21:32,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:32,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302031076] [2020-08-21 17:21:32,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:32,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:32,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 17:21:32,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:32,938 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:32,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302031076] [2020-08-21 17:21:32,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:32,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:21:32,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143131906] [2020-08-21 17:21:32,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:21:32,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:32,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:21:32,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:21:32,940 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 17:21:33,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:33,002 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 17:21:33,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:21:33,002 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 17:21:33,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:33,003 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:21:33,003 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:21:33,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:21:33,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:21:33,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 17:21:33,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:21:33,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 17:21:33,010 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 17:21:33,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:33,010 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 17:21:33,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:21:33,010 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 17:21:33,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:21:33,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:33,012 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:33,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:21:33,012 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:33,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:33,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 17:21:33,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:33,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [402930468] [2020-08-21 17:21:33,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:33,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:33,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 17:21:33,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,105 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:33,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [402930468] [2020-08-21 17:21:33,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:33,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:21:33,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35861981] [2020-08-21 17:21:33,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:21:33,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:33,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:21:33,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:21:33,107 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 17:21:33,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:33,201 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 17:21:33,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:21:33,201 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 17:21:33,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:33,202 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:21:33,202 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:21:33,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:21:33,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:21:33,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 17:21:33,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:21:33,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 17:21:33,209 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 17:21:33,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:33,209 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 17:21:33,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:21:33,209 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 17:21:33,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:21:33,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:33,210 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:33,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:21:33,211 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:33,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:33,211 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 17:21:33,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:33,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172186135] [2020-08-21 17:21:33,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:33,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:33,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:21:33,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,339 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:33,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172186135] [2020-08-21 17:21:33,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:33,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:21:33,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081978921] [2020-08-21 17:21:33,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:21:33,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:33,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:21:33,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:21:33,342 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 17:21:33,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:33,429 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 17:21:33,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:21:33,430 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 17:21:33,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:33,431 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:21:33,431 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:21:33,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:21:33,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:21:33,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 17:21:33,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:21:33,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 17:21:33,437 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 17:21:33,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:33,437 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 17:21:33,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:21:33,438 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 17:21:33,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:21:33,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:33,439 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:33,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:21:33,439 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:33,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:33,440 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 17:21:33,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:33,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108294456] [2020-08-21 17:21:33,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:33,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:33,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 17:21:33,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,551 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:33,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108294456] [2020-08-21 17:21:33,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:33,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:21:33,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116170937] [2020-08-21 17:21:33,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:21:33,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:33,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:21:33,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:21:33,554 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 17:21:33,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:33,645 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 17:21:33,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:21:33,646 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 17:21:33,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:33,647 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:21:33,647 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:21:33,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:21:33,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:21:33,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 17:21:33,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:21:33,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 17:21:33,654 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 17:21:33,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:33,655 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 17:21:33,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:21:33,655 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 17:21:33,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:21:33,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:33,656 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:33,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:21:33,657 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:33,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:33,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 17:21:33,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:33,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509737751] [2020-08-21 17:21:33,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:33,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:33,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 17:21:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,803 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:33,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509737751] [2020-08-21 17:21:33,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:33,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:21:33,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724196285] [2020-08-21 17:21:33,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:21:33,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:33,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:21:33,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:21:33,806 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 17:21:33,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:33,869 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 17:21:33,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:21:33,870 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 17:21:33,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:33,871 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:21:33,871 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:21:33,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:21:33,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:21:33,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 17:21:33,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:21:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 17:21:33,876 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 17:21:33,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:33,877 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 17:21:33,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:21:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 17:21:33,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:21:33,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:33,878 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:33,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:21:33,878 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:33,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:33,879 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 17:21:33,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:33,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365452423] [2020-08-21 17:21:33,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:33,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:33,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:33,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 17:21:33,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:34,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365452423] [2020-08-21 17:21:34,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:34,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:21:34,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544442181] [2020-08-21 17:21:34,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:21:34,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:34,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:21:34,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:21:34,004 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 17:21:34,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:34,095 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 17:21:34,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:21:34,096 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 17:21:34,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:34,097 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:21:34,097 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:21:34,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:21:34,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:21:34,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 17:21:34,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:21:34,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 17:21:34,102 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 17:21:34,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:34,103 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 17:21:34,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:21:34,103 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 17:21:34,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:21:34,104 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:34,104 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:34,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:21:34,105 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:34,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:34,105 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 17:21:34,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:34,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259706119] [2020-08-21 17:21:34,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:34,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:34,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 17:21:34,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,250 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:34,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259706119] [2020-08-21 17:21:34,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:34,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:21:34,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372776746] [2020-08-21 17:21:34,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:21:34,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:34,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:21:34,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:21:34,253 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 17:21:34,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:34,346 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 17:21:34,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:21:34,347 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 17:21:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:34,348 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:21:34,348 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:21:34,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:21:34,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:21:34,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 17:21:34,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:21:34,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 17:21:34,354 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 17:21:34,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:34,354 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 17:21:34,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:21:34,354 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 17:21:34,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:21:34,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:34,355 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:34,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:21:34,356 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:34,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:34,356 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 17:21:34,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:34,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592375709] [2020-08-21 17:21:34,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:34,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:34,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 17:21:34,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,518 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:34,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592375709] [2020-08-21 17:21:34,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:34,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:21:34,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001946549] [2020-08-21 17:21:34,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:21:34,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:34,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:21:34,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:21:34,521 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 17:21:34,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:34,636 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 17:21:34,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:21:34,637 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 17:21:34,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:34,638 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:21:34,638 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:21:34,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:21:34,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:21:34,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 17:21:34,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:21:34,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 17:21:34,648 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 17:21:34,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:34,648 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 17:21:34,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:21:34,649 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 17:21:34,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 17:21:34,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:34,649 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:34,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:21:34,652 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:34,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:34,653 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 17:21:34,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:34,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228196657] [2020-08-21 17:21:34,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:34,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:34,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 17:21:34,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:34,824 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:34,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228196657] [2020-08-21 17:21:34,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:34,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:21:34,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999140662] [2020-08-21 17:21:34,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:21:34,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:34,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:21:34,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:21:34,827 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 17:21:34,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:34,912 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 17:21:34,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:21:34,913 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 17:21:34,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:34,914 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:21:34,914 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:21:34,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:21:34,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:21:34,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 17:21:34,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:21:34,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 17:21:34,919 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 17:21:34,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:34,920 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 17:21:34,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:21:34,920 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 17:21:34,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:21:34,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:34,921 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:34,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:21:34,921 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:34,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:34,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 17:21:34,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:34,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088931134] [2020-08-21 17:21:34,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:34,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:35,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 17:21:35,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,100 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:35,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088931134] [2020-08-21 17:21:35,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:35,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:21:35,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293006027] [2020-08-21 17:21:35,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:21:35,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:35,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:21:35,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:21:35,103 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 17:21:35,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:35,225 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 17:21:35,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:21:35,225 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 17:21:35,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:35,226 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:21:35,226 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:21:35,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:21:35,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:21:35,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 17:21:35,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:21:35,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 17:21:35,232 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 17:21:35,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:35,232 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 17:21:35,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:21:35,233 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 17:21:35,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:21:35,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:35,233 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:35,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:21:35,234 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:35,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:35,234 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 17:21:35,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:35,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923997143] [2020-08-21 17:21:35,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:35,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:35,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 17:21:35,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,467 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:35,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923997143] [2020-08-21 17:21:35,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:35,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:21:35,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017617939] [2020-08-21 17:21:35,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:21:35,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:35,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:21:35,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:21:35,470 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 17:21:35,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:35,593 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 17:21:35,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:21:35,594 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 17:21:35,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:35,595 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:21:35,595 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 17:21:35,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:21:35,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 17:21:35,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 17:21:35,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:21:35,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 17:21:35,601 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 17:21:35,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:35,601 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 17:21:35,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:21:35,601 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 17:21:35,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:21:35,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:35,602 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:35,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:21:35,603 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:35,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:35,603 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 17:21:35,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:35,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724102625] [2020-08-21 17:21:35,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:35,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:35,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 17:21:35,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:35,839 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:35,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724102625] [2020-08-21 17:21:35,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:35,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:21:35,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335180470] [2020-08-21 17:21:35,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:21:35,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:35,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:21:35,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:21:35,841 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 17:21:35,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:35,931 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 17:21:35,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:21:35,931 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 17:21:35,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:35,932 INFO L225 Difference]: With dead ends: 64 [2020-08-21 17:21:35,932 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:21:35,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:21:35,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:21:35,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 17:21:35,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:21:35,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 17:21:35,938 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 17:21:35,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:35,939 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 17:21:35,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:21:35,939 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 17:21:35,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:21:35,940 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:35,940 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:35,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:21:35,941 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:35,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:35,941 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 17:21:35,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:35,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043625279] [2020-08-21 17:21:35,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:35,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:36,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 17:21:36,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,173 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:36,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043625279] [2020-08-21 17:21:36,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:36,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:21:36,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838622941] [2020-08-21 17:21:36,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:21:36,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:36,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:21:36,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:21:36,176 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 17:21:36,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:36,283 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 17:21:36,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:21:36,284 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 17:21:36,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:36,285 INFO L225 Difference]: With dead ends: 66 [2020-08-21 17:21:36,285 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:21:36,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:21:36,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:21:36,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 17:21:36,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:21:36,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 17:21:36,290 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 17:21:36,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:36,291 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 17:21:36,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:21:36,291 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 17:21:36,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:21:36,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:36,292 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:36,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:21:36,292 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:36,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:36,293 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 17:21:36,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:36,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151469866] [2020-08-21 17:21:36,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:36,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:36,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 17:21:36,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,563 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:36,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151469866] [2020-08-21 17:21:36,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:36,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:21:36,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817646486] [2020-08-21 17:21:36,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:21:36,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:36,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:21:36,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:21:36,566 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 17:21:36,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:36,687 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 17:21:36,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:21:36,687 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 17:21:36,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:36,688 INFO L225 Difference]: With dead ends: 68 [2020-08-21 17:21:36,688 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:21:36,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:21:36,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:21:36,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 17:21:36,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:21:36,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 17:21:36,693 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 17:21:36,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:36,693 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 17:21:36,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:21:36,694 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 17:21:36,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:21:36,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:36,694 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:36,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:21:36,695 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:36,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:36,695 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 17:21:36,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:36,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537816194] [2020-08-21 17:21:36,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:36,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:36,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 17:21:36,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:36,963 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:36,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537816194] [2020-08-21 17:21:36,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:36,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:21:36,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963807206] [2020-08-21 17:21:36,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:21:36,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:36,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:21:36,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:21:36,966 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 17:21:37,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:37,071 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 17:21:37,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:21:37,072 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 17:21:37,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:37,073 INFO L225 Difference]: With dead ends: 70 [2020-08-21 17:21:37,073 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:21:37,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:21:37,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:21:37,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 17:21:37,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:21:37,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 17:21:37,078 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 17:21:37,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:37,078 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 17:21:37,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:21:37,078 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 17:21:37,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:21:37,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:37,079 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:37,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:21:37,080 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:37,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:37,080 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 17:21:37,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:37,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829820521] [2020-08-21 17:21:37,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:37,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:37,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:21:37,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:37,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 17:21:37,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:21:37,373 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:21:37,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829820521] [2020-08-21 17:21:37,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:21:37,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:21:37,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560871690] [2020-08-21 17:21:37,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:21:37,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:21:37,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:21:37,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:21:37,376 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 17:21:37,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:21:37,513 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 17:21:37,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:21:37,514 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 17:21:37,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:21:37,515 INFO L225 Difference]: With dead ends: 71 [2020-08-21 17:21:37,515 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 17:21:37,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:21:37,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 17:21:37,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 17:21:37,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 17:21:37,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 17:21:37,520 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 17:21:37,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:21:37,520 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 17:21:37,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:21:37,520 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 17:21:37,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 17:21:37,521 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:21:37,521 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:21:37,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:21:37,522 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:21:37,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:21:37,522 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 17:21:37,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:21:37,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051910590] [2020-08-21 17:21:37,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:21:37,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:21:37,616 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:21:37,616 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:21:37,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:21:37,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:21:37 BoogieIcfgContainer [2020-08-21 17:21:37,645 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:21:37,648 INFO L168 Benchmark]: Toolchain (without parser) took 6840.25 ms. Allocated memory was 137.9 MB in the beginning and 316.7 MB in the end (delta: 178.8 MB). Free memory was 99.4 MB in the beginning and 243.9 MB in the end (delta: -144.5 MB). Peak memory consumption was 34.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,649 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 137.9 MB. Free memory was 118.2 MB in the beginning and 117.7 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,649 INFO L168 Benchmark]: CACSL2BoogieTranslator took 380.29 ms. Allocated memory was 137.9 MB in the beginning and 200.8 MB in the end (delta: 62.9 MB). Free memory was 99.4 MB in the beginning and 179.4 MB in the end (delta: -80.0 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,650 INFO L168 Benchmark]: Boogie Preprocessor took 36.63 ms. Allocated memory is still 200.8 MB. Free memory was 179.4 MB in the beginning and 177.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,651 INFO L168 Benchmark]: RCFGBuilder took 350.71 ms. Allocated memory is still 200.8 MB. Free memory was 177.1 MB in the beginning and 162.2 MB in the end (delta: 14.8 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,651 INFO L168 Benchmark]: TraceAbstraction took 6062.20 ms. Allocated memory was 200.8 MB in the beginning and 316.7 MB in the end (delta: 115.9 MB). Free memory was 161.3 MB in the beginning and 243.9 MB in the end (delta: -82.6 MB). Peak memory consumption was 33.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:21:37,654 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 137.9 MB. Free memory was 118.2 MB in the beginning and 117.7 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 380.29 ms. Allocated memory was 137.9 MB in the beginning and 200.8 MB in the end (delta: 62.9 MB). Free memory was 99.4 MB in the beginning and 179.4 MB in the end (delta: -80.0 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 36.63 ms. Allocated memory is still 200.8 MB. Free memory was 179.4 MB in the beginning and 177.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 350.71 ms. Allocated memory is still 200.8 MB. Free memory was 177.1 MB in the beginning and 162.2 MB in the end (delta: 14.8 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6062.20 ms. Allocated memory was 200.8 MB in the beginning and 316.7 MB in the end (delta: 115.9 MB). Free memory was 161.3 MB in the beginning and 243.9 MB in the end (delta: -82.6 MB). Peak memory consumption was 33.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.9s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...