/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:24:47,376 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:24:47,378 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:24:47,408 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:24:47,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:24:47,424 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:24:47,425 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:24:47,426 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:24:47,428 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:24:47,429 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:24:47,430 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:24:47,434 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:24:47,436 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:24:47,437 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:24:47,437 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:24:47,439 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:24:47,444 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:24:47,449 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:24:47,450 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:24:47,450 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:24:47,453 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:24:47,465 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:24:47,465 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:24:47,467 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:24:47,467 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:24:47,467 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:24:47,467 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:24:47,468 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:24:47,468 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:24:47,468 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:24:47,468 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:24:47,469 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:24:47,469 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:24:47,470 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:24:47,470 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:24:47,805 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:24:47,828 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:24:47,830 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:24:47,831 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:24:47,836 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:24:47,836 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2021-05-06 11:24:47,891 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6be0f378b/f79aec008ff3427889807a920b4c3295/FLAG6a62048e4 [2021-05-06 11:24:48,221 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:24:48,222 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2021-05-06 11:24:48,225 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6be0f378b/f79aec008ff3427889807a920b4c3295/FLAG6a62048e4 [2021-05-06 11:24:48,238 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6be0f378b/f79aec008ff3427889807a920b4c3295 [2021-05-06 11:24:48,240 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:24:48,242 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:24:48,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:48,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:24:48,248 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:24:48,248 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,249 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@742637d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48, skipping insertion in model container [2021-05-06 11:24:48,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:24:48,262 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:24:48,366 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c[322,335] [2021-05-06 11:24:48,374 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:48,380 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:24:48,456 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c[322,335] [2021-05-06 11:24:48,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:24:48,473 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:24:48,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48 WrapperNode [2021-05-06 11:24:48,473 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:24:48,474 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:24:48,474 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:24:48,474 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:24:48,481 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,485 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,485 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,492 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,496 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,501 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... [2021-05-06 11:24:48,504 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:24:48,506 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:24:48,506 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:24:48,506 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:24:48,506 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:24:48,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:24:48,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:24:48,581 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:24:48,581 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:24:48,582 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:24:48,582 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:24:48,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:24:48,737 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:24:48,737 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:24:48,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:48 BoogieIcfgContainer [2021-05-06 11:24:48,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:24:48,739 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:24:48,739 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:24:48,741 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:24:48,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:24:48" (1/3) ... [2021-05-06 11:24:48,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56771a84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:48, skipping insertion in model container [2021-05-06 11:24:48,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:24:48" (2/3) ... [2021-05-06 11:24:48,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56771a84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:24:48, skipping insertion in model container [2021-05-06 11:24:48,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:24:48" (3/3) ... [2021-05-06 11:24:48,743 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2021-05-06 11:24:48,747 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:24:48,749 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:24:48,759 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:24:48,770 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:24:48,770 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:24:48,770 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:24:48,770 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:24:48,770 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:24:48,770 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:24:48,771 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:24:48,771 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:24:48,778 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:24:48,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:24:48,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:48,782 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:48,782 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:48,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:48,786 INFO L82 PathProgramCache]: Analyzing trace with hash 2021311625, now seen corresponding path program 1 times [2021-05-06 11:24:48,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:48,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135004793] [2021-05-06 11:24:48,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:48,826 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:48,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:48,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:48,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:48,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:48,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:48,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135004793] [2021-05-06 11:24:48,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2135004793] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:48,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:48,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:24:48,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866851145] [2021-05-06 11:24:48,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:24:48,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:48,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:24:48,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:24:48,971 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:49,061 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2021-05-06 11:24:49,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:24:49,062 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:24:49,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:49,066 INFO L225 Difference]: With dead ends: 37 [2021-05-06 11:24:49,066 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:24:49,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 77.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:24:49,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:24:49,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-05-06 11:24:49,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 11:24:49,099 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 11:24:49,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:49,099 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 11:24:49,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,100 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 11:24:49,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:24:49,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:49,101 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:49,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:24:49,101 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:49,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:49,103 INFO L82 PathProgramCache]: Analyzing trace with hash -2037585725, now seen corresponding path program 1 times [2021-05-06 11:24:49,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:49,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [683263271] [2021-05-06 11:24:49,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:49,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:49,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-06 11:24:49,177 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:49,179 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:49,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:49,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:49,316 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:49,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [683263271] [2021-05-06 11:24:49,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [683263271] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:49,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:49,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:24:49,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052574958] [2021-05-06 11:24:49,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:24:49,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:49,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:24:49,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:24:49,318 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:49,416 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-06 11:24:49,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:24:49,417 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:24:49,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:49,417 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:24:49,418 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 11:24:49,418 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 85.9ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:24:49,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 11:24:49,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2021-05-06 11:24:49,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-06 11:24:49,423 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-05-06 11:24:49,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:49,423 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-06 11:24:49,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,423 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-06 11:24:49,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:24:49,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:49,424 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:49,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:24:49,424 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:49,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:49,424 INFO L82 PathProgramCache]: Analyzing trace with hash -183414982, now seen corresponding path program 1 times [2021-05-06 11:24:49,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:49,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376175054] [2021-05-06 11:24:49,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:49,465 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:49,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:49,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:49,550 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:49,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:49,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:49,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:49,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:49,589 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:49,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:49,691 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:49,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376175054] [2021-05-06 11:24:49,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [376175054] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:49,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:49,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:24:49,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353394469] [2021-05-06 11:24:49,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:24:49,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:49,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:24:49,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:24:49,693 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:49,790 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-05-06 11:24:49,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:24:49,790 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 11:24:49,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:49,791 INFO L225 Difference]: With dead ends: 27 [2021-05-06 11:24:49,791 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 11:24:49,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 110.5ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:24:49,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 11:24:49,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2021-05-06 11:24:49,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-06 11:24:49,795 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2021-05-06 11:24:49,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:49,795 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-06 11:24:49,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,796 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-06 11:24:49,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 11:24:49,796 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:49,796 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:49,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:24:49,796 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:49,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:49,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1461303203, now seen corresponding path program 2 times [2021-05-06 11:24:49,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:49,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635212111] [2021-05-06 11:24:49,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:49,810 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:49,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:49,832 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:49,840 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:49,853 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:49,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:49,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:49,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:49,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:49,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:49,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:49,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:49,952 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:49,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635212111] [2021-05-06 11:24:49,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [635212111] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:49,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:49,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:24:49,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183433286] [2021-05-06 11:24:49,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:24:49,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:49,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:24:49,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:24:49,953 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:50,070 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-06 11:24:50,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:24:50,071 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 11:24:50,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:50,071 INFO L225 Difference]: With dead ends: 28 [2021-05-06 11:24:50,071 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:24:50,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 121.2ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:24:50,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:24:50,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-05-06 11:24:50,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-05-06 11:24:50,076 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-05-06 11:24:50,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:50,076 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-05-06 11:24:50,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,076 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-05-06 11:24:50,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:24:50,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:50,077 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:50,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:24:50,077 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:50,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:50,077 INFO L82 PathProgramCache]: Analyzing trace with hash 907959386, now seen corresponding path program 3 times [2021-05-06 11:24:50,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:50,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56739883] [2021-05-06 11:24:50,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:50,107 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:50,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,138 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:50,152 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,167 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,174 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:50,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:50,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:50,282 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:50,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56739883] [2021-05-06 11:24:50,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [56739883] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:50,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:50,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:24:50,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038648071] [2021-05-06 11:24:50,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:24:50,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:50,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:24:50,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:24:50,285 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:50,440 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-05-06 11:24:50,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:24:50,441 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:24:50,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:50,442 INFO L225 Difference]: With dead ends: 29 [2021-05-06 11:24:50,442 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 11:24:50,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 175.4ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:24:50,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 11:24:50,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-06 11:24:50,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-06 11:24:50,446 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2021-05-06 11:24:50,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:50,446 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-06 11:24:50,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,446 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-06 11:24:50,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 11:24:50,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:50,446 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:50,446 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:24:50,447 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:50,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:50,447 INFO L82 PathProgramCache]: Analyzing trace with hash 934170243, now seen corresponding path program 4 times [2021-05-06 11:24:50,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:50,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111946904] [2021-05-06 11:24:50,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:50,458 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:50,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,488 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:50,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,521 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,522 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:50,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:50,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:50,606 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:50,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111946904] [2021-05-06 11:24:50,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1111946904] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:50,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:50,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:24:50,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974139448] [2021-05-06 11:24:50,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:24:50,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:50,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:24:50,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:24:50,607 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:50,784 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-06 11:24:50,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:24:50,784 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-06 11:24:50,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:50,784 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:24:50,784 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 11:24:50,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 174.3ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:24:50,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 11:24:50,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2021-05-06 11:24:50,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-06 11:24:50,788 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-05-06 11:24:50,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:50,788 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-06 11:24:50,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:50,789 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-06 11:24:50,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:24:50,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:50,789 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:50,789 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:24:50,789 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:50,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:50,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1746706810, now seen corresponding path program 5 times [2021-05-06 11:24:50,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:50,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085754044] [2021-05-06 11:24:50,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:50,801 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:50,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,830 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:50,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:50,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:50,862 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:50,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:50,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:50,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:50,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:50,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085754044] [2021-05-06 11:24:50,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1085754044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:50,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:50,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:24:50,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173095347] [2021-05-06 11:24:50,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:24:50,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:50,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:24:50,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:24:50,959 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:51,140 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 11:24:51,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:24:51,141 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 11:24:51,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:51,141 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:24:51,141 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:24:51,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 203.5ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:24:51,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:24:51,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-06 11:24:51,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-06 11:24:51,145 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2021-05-06 11:24:51,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:51,145 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-06 11:24:51,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,145 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-06 11:24:51,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:24:51,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:51,146 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:51,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:24:51,146 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:51,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:51,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1165536611, now seen corresponding path program 6 times [2021-05-06 11:24:51,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:51,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836272853] [2021-05-06 11:24:51,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:51,157 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:51,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:51,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:51,181 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:51,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:51,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:51,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:51,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:51,211 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:51,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:51,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:51,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:51,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:51,352 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:51,352 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836272853] [2021-05-06 11:24:51,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [836272853] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:51,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:51,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:24:51,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334568635] [2021-05-06 11:24:51,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:24:51,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:51,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:24:51,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:24:51,353 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:51,560 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 11:24:51,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:24:51,561 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:24:51,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:51,561 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:24:51,561 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 11:24:51,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 229.7ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:24:51,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 11:24:51,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-05-06 11:24:51,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-06 11:24:51,565 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2021-05-06 11:24:51,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:51,565 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-06 11:24:51,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,565 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-06 11:24:51,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:24:51,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:51,566 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:51,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:24:51,566 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:51,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:51,566 INFO L82 PathProgramCache]: Analyzing trace with hash 329129626, now seen corresponding path program 7 times [2021-05-06 11:24:51,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:51,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898658243] [2021-05-06 11:24:51,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:51,576 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:51,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:51,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:51,600 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:51,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:51,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:51,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:51,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:51,631 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:51,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:51,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:51,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:51,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:51,750 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:51,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898658243] [2021-05-06 11:24:51,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1898658243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:51,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:51,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:24:51,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975101872] [2021-05-06 11:24:51,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:24:51,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:51,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:24:51,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:24:51,751 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:51,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:51,999 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-06 11:24:52,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:24:52,000 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 11:24:52,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:52,000 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:24:52,000 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:24:52,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 267.8ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:24:52,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:24:52,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-06 11:24:52,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:52,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-06 11:24:52,004 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2021-05-06 11:24:52,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:52,005 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-06 11:24:52,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:52,005 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-06 11:24:52,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 11:24:52,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:52,005 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:52,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:24:52,005 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:52,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:52,006 INFO L82 PathProgramCache]: Analyzing trace with hash 170316867, now seen corresponding path program 8 times [2021-05-06 11:24:52,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:52,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874412034] [2021-05-06 11:24:52,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:52,015 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:52,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:52,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:52,037 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:52,049 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:52,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:52,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:52,065 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:52,066 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:52,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:52,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:52,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:52,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:52,186 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:52,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874412034] [2021-05-06 11:24:52,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [874412034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:52,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:52,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:24:52,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613276539] [2021-05-06 11:24:52,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:24:52,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:52,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:24:52,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:24:52,188 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:52,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:52,477 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 11:24:52,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:24:52,478 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-06 11:24:52,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:52,478 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:24:52,478 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:24:52,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 300.2ms TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:24:52,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:24:52,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-05-06 11:24:52,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:52,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-06 11:24:52,483 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-05-06 11:24:52,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:52,483 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-06 11:24:52,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:52,484 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-06 11:24:52,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:24:52,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:52,484 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:52,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:24:52,484 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:52,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:52,485 INFO L82 PathProgramCache]: Analyzing trace with hash -457911366, now seen corresponding path program 9 times [2021-05-06 11:24:52,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:52,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127150525] [2021-05-06 11:24:52,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:52,495 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:52,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:52,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:52,521 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:52,535 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:52,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:52,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:52,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 4 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:52,554 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:52,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:52,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:52,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:52,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:52,691 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:52,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127150525] [2021-05-06 11:24:52,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1127150525] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:52,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:52,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:24:52,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903664995] [2021-05-06 11:24:52,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:24:52,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:52,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:24:52,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:24:52,692 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:53,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:53,010 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-05-06 11:24:53,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:24:53,011 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:24:53,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:53,011 INFO L225 Difference]: With dead ends: 35 [2021-05-06 11:24:53,011 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:24:53,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 330.0ms TimeCoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:24:53,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:24:53,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-05-06 11:24:53,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:53,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-05-06 11:24:53,015 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2021-05-06 11:24:53,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:53,015 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-05-06 11:24:53,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:53,015 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-05-06 11:24:53,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:24:53,016 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:53,016 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:53,016 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:24:53,016 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:53,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:53,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1541849891, now seen corresponding path program 10 times [2021-05-06 11:24:53,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:53,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710261113] [2021-05-06 11:24:53,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:53,025 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:24:53,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:53,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:53,049 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:24:53,060 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:53,068 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.0 percent of original size [2021-05-06 11:24:53,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:24:53,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:24:53,110 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.0 percent of original size 57 [2021-05-06 11:24:53,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:24:53,128 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:24:53,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:53,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:53,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:53,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:53,652 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:53,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710261113] [2021-05-06 11:24:53,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [710261113] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:53,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:53,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:24:53,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008706204] [2021-05-06 11:24:53,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:24:53,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:53,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:24:53,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:24:53,653 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:54,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:54,906 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2021-05-06 11:24:54,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:24:54,906 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-06 11:24:54,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:54,906 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:24:54,906 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 11:24:54,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 1527.8ms TimeCoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:24:54,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 11:24:54,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 11:24:54,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 11:24:54,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 11:24:54,908 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 24 [2021-05-06 11:24:54,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:54,908 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 11:24:54,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:54,908 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 11:24:54,908 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 11:24:54,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:24:54,909 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 11:24:55,098 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 95 [2021-05-06 11:24:55,544 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 50 [2021-05-06 11:24:55,566 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2021-05-06 11:24:55,566 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2021-05-06 11:24:55,567 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point mainEXIT(lines 12 27) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L194 CegarLoopUtils]: At program point L19-2(lines 19 21) the Hoare annotation is: (let ((.cse0 (or (= main_~x~0 0) (and (<= (div (+ (* main_~x~0 (- 1)) 268435455) (- 4294967296)) 0) (< 0 main_~x~0)))) (.cse1 (< (mod main_~x~0 4294967296) 268435455))) (or (and (= main_~y~0 9) .cse0 .cse1) (and (= main_~y~0 0) .cse0 .cse1) (and (= 5 main_~y~0) .cse0 .cse1) (and (= main_~y~0 1) .cse0 .cse1) (and .cse0 .cse1 (= main_~y~0 3)) (and .cse0 (= 7 main_~y~0) .cse1) (and .cse0 (= main_~y~0 2) .cse1) (and .cse0 .cse1 (= main_~y~0 4)) (and .cse0 .cse1 (= main_~y~0 6)) (and (= main_~y~0 8) .cse0 .cse1) (and .cse0 (= main_~y~0 10) .cse1))) [2021-05-06 11:24:55,567 INFO L194 CegarLoopUtils]: At program point L19-3(lines 19 21) the Hoare annotation is: (and (or (= main_~x~0 0) (and (<= (div (+ (* main_~x~0 (- 1)) 268435455) (- 4294967296)) 0) (< 0 main_~x~0))) (= main_~y~0 10) (< (mod main_~x~0 4294967296) 268435455)) [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point mainFINAL(lines 12 27) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 12 27) the Hoare annotation is: true [2021-05-06 11:24:55,567 INFO L194 CegarLoopUtils]: At program point L16-2(lines 16 24) the Hoare annotation is: (or (and (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (= main_~y~0 10) (or (and (< 1 main_~x~0) (<= (div (+ (* main_~x~0 (- 1)) 268435456) (- 4294967296)) 0)) (= main_~x~0 1))) (and (= main_~y~0 0) (= main_~x~0 0))) [2021-05-06 11:24:55,568 INFO L194 CegarLoopUtils]: At program point L16-3(lines 16 24) the Hoare annotation is: (and (<= (+ (* 4294967296 (div (+ (* main_~x~0 (- 1)) 268435455) (- 4294967296))) (* 4294967296 (div main_~x~0 4294967296)) 268435455) main_~x~0) (= main_~y~0 10) (< 1 main_~x~0)) [2021-05-06 11:24:55,568 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 5 10) the Hoare annotation is: true [2021-05-06 11:24:55,568 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertEXIT(lines 5 10) the Hoare annotation is: true [2021-05-06 11:24:55,568 INFO L194 CegarLoopUtils]: At program point L7(line 7) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2021-05-06 11:24:55,568 INFO L194 CegarLoopUtils]: At program point L6(lines 6 8) the Hoare annotation is: (or (<= 1 __VERIFIER_assert_~cond) (not (<= 1 |__VERIFIER_assert_#in~cond|))) [2021-05-06 11:24:55,568 INFO L201 CegarLoopUtils]: At program point L6-2(lines 5 10) the Hoare annotation is: true [2021-05-06 11:24:55,568 INFO L194 CegarLoopUtils]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) the Hoare annotation is: (not (<= 1 |__VERIFIER_assert_#in~cond|)) [2021-05-06 11:24:55,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:24:55 BoogieIcfgContainer [2021-05-06 11:24:55,580 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:24:55,580 INFO L168 Benchmark]: Toolchain (without parser) took 7338.78 ms. Allocated memory was 174.1 MB in the beginning and 361.8 MB in the end (delta: 187.7 MB). Free memory was 138.7 MB in the beginning and 238.4 MB in the end (delta: -99.8 MB). Peak memory consumption was 158.6 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 174.1 MB. Free memory is still 155.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L168 Benchmark]: CACSL2BoogieTranslator took 228.09 ms. Allocated memory is still 174.1 MB. Free memory was 138.5 MB in the beginning and 157.2 MB in the end (delta: -18.7 MB). Peak memory consumption was 16.5 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L168 Benchmark]: Boogie Preprocessor took 30.45 ms. Allocated memory is still 174.1 MB. Free memory was 157.2 MB in the beginning and 155.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L168 Benchmark]: RCFGBuilder took 232.61 ms. Allocated memory is still 174.1 MB. Free memory was 155.7 MB in the beginning and 142.7 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L168 Benchmark]: TraceAbstraction took 6840.82 ms. Allocated memory was 174.1 MB in the beginning and 361.8 MB in the end (delta: 187.7 MB). Free memory was 142.1 MB in the beginning and 238.4 MB in the end (delta: -96.4 MB). Peak memory consumption was 161.0 MB. Max. memory is 8.0 GB. [2021-05-06 11:24:55,581 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 174.1 MB. Free memory is still 155.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 228.09 ms. Allocated memory is still 174.1 MB. Free memory was 138.5 MB in the beginning and 157.2 MB in the end (delta: -18.7 MB). Peak memory consumption was 16.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 30.45 ms. Allocated memory is still 174.1 MB. Free memory was 157.2 MB in the beginning and 155.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 232.61 ms. Allocated memory is still 174.1 MB. Free memory was 155.7 MB in the beginning and 142.7 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6840.82 ms. Allocated memory was 174.1 MB in the beginning and 361.8 MB in the end (delta: 187.7 MB). Free memory was 142.1 MB in the beginning and 238.4 MB in the end (delta: -96.4 MB). Peak memory consumption was 161.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6139.7ms, OverallIterations: 12, TraceHistogramMax: 10, EmptinessCheckTime: 10.0ms, AutomataDifference: 3266.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 657.6ms, InitialAbstractionConstructionTime: 5.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 133 SDtfs, 156 SDslu, 196 SDs, 0 SdLazy, 1020 SolverSat, 223 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 610.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 316 GetRequests, 107 SyntacticMatches, 22 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 3603.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=11, InterpolantAutomatonStates: 127, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 59.5ms AutomataMinimizationTime, 12 MinimizatonAttempts, 22 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 20 LocationsWithAnnotation, 92 PreInvPairs, 145 NumberOfFragments, 433 HoareAnnotationTreeSize, 92 FomulaSimplifications, 1755690 FormulaSimplificationTreeSizeReduction, 199.7ms HoareSimplificationTime, 20 FomulaSimplificationsInter, 1070 FormulaSimplificationTreeSizeReductionInter, 449.0ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 19]: Loop Invariant Derived loop invariant: (((((((((((y == 9 && (x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x))) && x % 4294967296 < 268435455) || ((y == 0 && (x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x))) && x % 4294967296 < 268435455)) || ((5 == y && (x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x))) && x % 4294967296 < 268435455)) || ((y == 1 && (x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x))) && x % 4294967296 < 268435455)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && x % 4294967296 < 268435455) && y == 3)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && 7 == y) && x % 4294967296 < 268435455)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && y == 2) && x % 4294967296 < 268435455)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && x % 4294967296 < 268435455) && y == 4)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && x % 4294967296 < 268435455) && y == 6)) || ((y == 8 && (x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x))) && x % 4294967296 < 268435455)) || (((x == 0 || ((x * -1 + 268435455) / -4294967296 <= 0 && 0 < x)) && y == 10) && x % 4294967296 < 268435455) - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: (((x + 4294967295) % 4294967296 < 268435455 && y == 10) && ((1 < x && (x * -1 + 268435456) / -4294967296 <= 0) || x == 1)) || (y == 0 && x == 0) - ProcedureContractResult [Line: 12]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 5]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 RESULT: Ultimate proved your program to be correct! Received shutdown request...