/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-simple/deep-nested.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:11:06,621 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:11:06,624 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:11:06,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 12:11:06,673 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 12:11:06,676 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 12:11:06,679 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 12:11:06,684 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 12:11:06,685 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 12:11:06,690 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 12:11:06,691 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 12:11:06,692 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 12:11:06,692 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:11:06,694 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:11:06,695 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:11:06,696 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:11:06,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:11:06,699 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:11:06,701 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:11:06,705 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:11:06,706 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:11:06,707 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:11:06,708 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:11:06,710 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:11:06,713 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 12:11:06,713 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 12:11:06,713 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 12:11:06,714 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 12:11:06,715 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 12:11:06,715 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 12:11:06,715 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 12:11:06,716 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 12:11:06,717 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 12:11:06,717 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 12:11:06,718 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 12:11:06,718 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 12:11:06,719 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 12:11:06,719 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 12:11:06,719 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:11:06,721 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:11:06,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:11:06,725 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 12:11:06,742 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:11:06,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:11:06,746 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:11:06,746 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:11:06,747 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:11:06,747 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:11:06,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:11:06,747 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:11:06,747 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:11:06,748 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:11:06,749 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:11:06,749 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:11:06,758 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:11:06,758 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:11:06,759 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:11:06,759 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:11:06,759 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:11:06,760 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:11:07,058 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:11:07,086 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:11:07,089 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:11:07,090 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:11:07,091 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:11:07,092 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-06 12:11:07,154 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e07d917/774f88df44724ea2b428c68060c97ee9/FLAG499ec3901 [2021-05-06 12:11:07,668 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:11:07,669 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-06 12:11:07,673 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e07d917/774f88df44724ea2b428c68060c97ee9/FLAG499ec3901 [2021-05-06 12:11:08,136 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e07d917/774f88df44724ea2b428c68060c97ee9 [2021-05-06 12:11:08,138 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:11:08,139 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:11:08,142 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:11:08,143 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:11:08,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:11:08,146 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,147 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a55dca6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08, skipping insertion in model container [2021-05-06 12:11:08,148 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,153 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:11:08,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:11:08,298 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-simple/deep-nested.c[625,638] [2021-05-06 12:11:08,316 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:11:08,321 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:11:08,366 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-simple/deep-nested.c[625,638] [2021-05-06 12:11:08,367 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:11:08,394 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:11:08,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08 WrapperNode [2021-05-06 12:11:08,395 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:11:08,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:11:08,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:11:08,396 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:11:08,421 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,421 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,426 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,427 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,431 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,449 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... [2021-05-06 12:11:08,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:11:08,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:11:08,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:11:08,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:11:08,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:11:08,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:11:08,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:11:08,526 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:11:08,526 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:11:08,526 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:11:08,526 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:11:08,527 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:11:08,528 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:11:08,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:11:08,767 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:11:08,768 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-06 12:11:08,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:11:08 BoogieIcfgContainer [2021-05-06 12:11:08,769 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:11:08,770 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:11:08,770 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:11:08,772 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:11:08,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:11:08" (1/3) ... [2021-05-06 12:11:08,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f6d24bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:11:08, skipping insertion in model container [2021-05-06 12:11:08,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:11:08" (2/3) ... [2021-05-06 12:11:08,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f6d24bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:11:08, skipping insertion in model container [2021-05-06 12:11:08,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:11:08" (3/3) ... [2021-05-06 12:11:08,773 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-05-06 12:11:08,776 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:11:08,778 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:11:08,788 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:11:08,800 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:11:08,800 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:11:08,800 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:11:08,800 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:11:08,800 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:11:08,800 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:11:08,801 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:11:08,801 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:11:08,809 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:11:08,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 12:11:08,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:08,814 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:08,814 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:08,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:08,817 INFO L82 PathProgramCache]: Analyzing trace with hash 764687304, now seen corresponding path program 1 times [2021-05-06 12:11:08,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:08,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572892535] [2021-05-06 12:11:08,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:08,859 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:11:08,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:09,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:09,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:09,039 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 12:11:09,040 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:09,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572892535] [2021-05-06 12:11:09,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1572892535] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:09,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:09,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 12:11:09,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135079428] [2021-05-06 12:11:09,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 12:11:09,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:09,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 12:11:09,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:11:09,053 INFO L87 Difference]: Start difference. First operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:09,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:09,260 INFO L93 Difference]: Finished difference Result 45 states and 68 transitions. [2021-05-06 12:11:09,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 12:11:09,262 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), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 12:11:09,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:09,267 INFO L225 Difference]: With dead ends: 45 [2021-05-06 12:11:09,267 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 12:11:09,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 151.9ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:11:09,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 12:11:09,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-06 12:11:09,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:09,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-06 12:11:09,303 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2021-05-06 12:11:09,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:09,304 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-06 12:11:09,305 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), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:09,305 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-06 12:11:09,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 12:11:09,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:09,306 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:09,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:11:09,307 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:09,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:09,308 INFO L82 PathProgramCache]: Analyzing trace with hash 296825287, now seen corresponding path program 1 times [2021-05-06 12:11:09,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:09,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557264268] [2021-05-06 12:11:09,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:09,355 WARN L240 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size [2021-05-06 12:11:09,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:09,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:09,444 WARN L245 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size 76 [2021-05-06 12:11:09,472 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 12:11:09,488 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 93.9 percent of original size [2021-05-06 12:11:09,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:09,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:13,529 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:11:17,550 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 18 [2021-05-06 12:11:21,565 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 12:11:21,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 44 [2021-05-06 12:11:21,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-05-06 12:11:21,644 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 93.9 percent of original size 93 [2021-05-06 12:11:21,670 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 12:11:21,678 WARN L240 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size [2021-05-06 12:11:21,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:21,728 WARN L245 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size 76 [2021-05-06 12:11:21,750 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 12:11:21,757 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 90.6 percent of original size [2021-05-06 12:11:21,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:21,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:25,808 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 12:11:29,857 WARN L205 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 18 [2021-05-06 12:11:33,876 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:11:33,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-05-06 12:11:33,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 12:11:33,930 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 90.6 percent of original size 87 [2021-05-06 12:11:33,986 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 12:11:33,993 WARN L240 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size [2021-05-06 12:11:33,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:34,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:11:34,034 WARN L245 tifierPushTermWalker]: treesize reduction 21, result has 78.4 percent of original size 76 [2021-05-06 12:11:34,058 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 12:11:34,060 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:11:34,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:34,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:34,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:34,267 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 12:11:34,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:34,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:34,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:34,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:11:34,432 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:34,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557264268] [2021-05-06 12:11:34,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1557264268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:34,432 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:34,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 12:11:34,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812390208] [2021-05-06 12:11:34,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 12:11:34,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:34,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 12:11:34,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:11:34,437 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:34,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:34,763 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-05-06 12:11:34,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 12:11:34,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 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 12:11:34,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:34,764 INFO L225 Difference]: With dead ends: 43 [2021-05-06 12:11:34,765 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 12:11:34,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 272.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-06 12:11:34,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 12:11:34,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2021-05-06 12:11:34,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 28 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:34,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-05-06 12:11:34,771 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 16 [2021-05-06 12:11:34,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:34,772 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-05-06 12:11:34,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:34,772 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-05-06 12:11:34,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 12:11:34,772 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:34,772 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:34,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:11:34,773 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:34,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:34,773 INFO L82 PathProgramCache]: Analyzing trace with hash -17409223, now seen corresponding path program 1 times [2021-05-06 12:11:34,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:34,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663163061] [2021-05-06 12:11:34,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:34,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:34,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-06 12:11:34,788 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 12:11:34,789 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:34,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:34,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:34,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:34,888 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 12:11:34,911 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:34,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663163061] [2021-05-06 12:11:34,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [663163061] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:34,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:34,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:11:34,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160220896] [2021-05-06 12:11:34,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:11:34,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:34,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:11:34,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:11:34,912 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:35,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:35,441 INFO L93 Difference]: Finished difference Result 111 states and 149 transitions. [2021-05-06 12:11:35,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 12:11:35,442 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 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 12:11:35,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:35,445 INFO L225 Difference]: With dead ends: 111 [2021-05-06 12:11:35,445 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 12:11:35,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 369.4ms TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:11:35,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 12:11:35,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 45. [2021-05-06 12:11:35,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 41 states have internal predecessors, (54), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:35,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2021-05-06 12:11:35,470 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 19 [2021-05-06 12:11:35,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:35,470 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2021-05-06 12:11:35,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:35,471 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2021-05-06 12:11:35,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 12:11:35,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:35,473 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:35,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 12:11:35,473 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:35,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:35,474 INFO L82 PathProgramCache]: Analyzing trace with hash 2022875386, now seen corresponding path program 1 times [2021-05-06 12:11:35,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:35,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126311230] [2021-05-06 12:11:35,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:35,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:35,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 20 [2021-05-06 12:11:35,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 5 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:35,500 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:35,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:35,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:35,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:35,656 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 12:11:35,720 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:35,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126311230] [2021-05-06 12:11:35,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126311230] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:35,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:35,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:11:35,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970779512] [2021-05-06 12:11:35,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:11:35,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:35,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:11:35,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:11:35,728 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:36,203 INFO L93 Difference]: Finished difference Result 146 states and 189 transitions. [2021-05-06 12:11:36,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:11:36,204 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-06 12:11:36,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:36,204 INFO L225 Difference]: With dead ends: 146 [2021-05-06 12:11:36,205 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 12:11:36,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 435.9ms TimeCoverageRelationStatistics Valid=94, Invalid=212, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:11:36,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 12:11:36,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 54. [2021-05-06 12:11:36,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 50 states have (on average 1.3) internal successors, (65), 50 states have internal predecessors, (65), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-05-06 12:11:36,217 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 28 [2021-05-06 12:11:36,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:36,217 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-05-06 12:11:36,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,217 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-05-06 12:11:36,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:11:36,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:36,218 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:36,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 12:11:36,218 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:36,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:36,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1029698240, now seen corresponding path program 1 times [2021-05-06 12:11:36,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:36,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631624013] [2021-05-06 12:11:36,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:36,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:11:36,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 7 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:36,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:36,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:36,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:36,389 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 12:11:36,464 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:36,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631624013] [2021-05-06 12:11:36,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1631624013] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:36,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:36,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 12:11:36,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520760711] [2021-05-06 12:11:36,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 12:11:36,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:36,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 12:11:36,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:11:36,465 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:36,745 INFO L93 Difference]: Finished difference Result 124 states and 159 transitions. [2021-05-06 12:11:36,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 12:11:36,746 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 12:11:36,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:36,746 INFO L225 Difference]: With dead ends: 124 [2021-05-06 12:11:36,746 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 12:11:36,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 251.0ms TimeCoverageRelationStatistics Valid=66, Invalid=90, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:11:36,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 12:11:36,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 56. [2021-05-06 12:11:36,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.2884615384615385) internal successors, (67), 52 states have internal predecessors, (67), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-06 12:11:36,760 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 37 [2021-05-06 12:11:36,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:36,760 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-06 12:11:36,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:36,760 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-06 12:11:36,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:11:36,777 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:36,777 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:36,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 12:11:36,778 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:36,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:36,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1383759705, now seen corresponding path program 1 times [2021-05-06 12:11:36,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:36,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542925396] [2021-05-06 12:11:36,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:36,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:36,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:36,836 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:36,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:36,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:37,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,018 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 12:11:37,183 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:37,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542925396] [2021-05-06 12:11:37,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [542925396] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:37,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:37,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 12:11:37,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669255381] [2021-05-06 12:11:37,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 12:11:37,184 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:37,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 12:11:37,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=64, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:11:37,185 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:37,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:37,510 INFO L93 Difference]: Finished difference Result 129 states and 164 transitions. [2021-05-06 12:11:37,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 12:11:37,510 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 12:11:37,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:37,511 INFO L225 Difference]: With dead ends: 129 [2021-05-06 12:11:37,511 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 12:11:37,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 417.9ms TimeCoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:11:37,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 12:11:37,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 59. [2021-05-06 12:11:37,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 55 states have internal predecessors, (70), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:37,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2021-05-06 12:11:37,522 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 43 [2021-05-06 12:11:37,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:37,522 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2021-05-06 12:11:37,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:37,522 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2021-05-06 12:11:37,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 12:11:37,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:37,523 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:37,523 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 12:11:37,523 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:37,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:37,523 INFO L82 PathProgramCache]: Analyzing trace with hash -10603240, now seen corresponding path program 2 times [2021-05-06 12:11:37,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:37,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995224815] [2021-05-06 12:11:37,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:37,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:37,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:37,568 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:37,570 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:37,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:37,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:37,716 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 12:11:37,904 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:37,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995224815] [2021-05-06 12:11:37,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1995224815] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:37,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:37,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 12:11:37,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076654529] [2021-05-06 12:11:37,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 12:11:37,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:37,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 12:11:37,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=78, Unknown=0, NotChecked=0, Total=132 [2021-05-06 12:11:37,906 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:38,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:38,250 INFO L93 Difference]: Finished difference Result 132 states and 167 transitions. [2021-05-06 12:11:38,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 12:11:38,251 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-06 12:11:38,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:38,251 INFO L225 Difference]: With dead ends: 132 [2021-05-06 12:11:38,251 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 12:11:38,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 11 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 454.3ms TimeCoverageRelationStatistics Valid=132, Invalid=210, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:11:38,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 12:11:38,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 62. [2021-05-06 12:11:38,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 58 states have internal predecessors, (73), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:38,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2021-05-06 12:11:38,264 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 46 [2021-05-06 12:11:38,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:38,264 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2021-05-06 12:11:38,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:38,264 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2021-05-06 12:11:38,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:11:38,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:38,265 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:38,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 12:11:38,265 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:38,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:38,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1446589177, now seen corresponding path program 3 times [2021-05-06 12:11:38,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:38,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [540684017] [2021-05-06 12:11:38,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:38,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:38,313 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:38,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:38,331 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:38,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:38,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:38,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:38,455 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 12:11:38,672 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:38,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [540684017] [2021-05-06 12:11:38,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [540684017] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:38,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:38,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 12:11:38,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138082860] [2021-05-06 12:11:38,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 12:11:38,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:38,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 12:11:38,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=94, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:11:38,674 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:39,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:39,101 INFO L93 Difference]: Finished difference Result 135 states and 170 transitions. [2021-05-06 12:11:39,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 12:11:39,101 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 12:11:39,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:39,102 INFO L225 Difference]: With dead ends: 135 [2021-05-06 12:11:39,102 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 12:11:39,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 11 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 532.0ms TimeCoverageRelationStatistics Valid=154, Invalid=266, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:11:39,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 12:11:39,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 65. [2021-05-06 12:11:39,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 61 states have (on average 1.2459016393442623) internal successors, (76), 61 states have internal predecessors, (76), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:39,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 79 transitions. [2021-05-06 12:11:39,115 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 79 transitions. Word has length 49 [2021-05-06 12:11:39,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:39,115 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 79 transitions. [2021-05-06 12:11:39,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:39,115 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 79 transitions. [2021-05-06 12:11:39,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 12:11:39,116 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:39,116 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:39,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 12:11:39,116 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:39,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:39,116 INFO L82 PathProgramCache]: Analyzing trace with hash -863543944, now seen corresponding path program 4 times [2021-05-06 12:11:39,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:39,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098947430] [2021-05-06 12:11:39,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:39,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:39,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:39,156 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:39,157 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:39,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:39,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:39,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:39,273 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 12:11:39,554 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:39,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098947430] [2021-05-06 12:11:39,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2098947430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:39,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:39,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:11:39,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178733839] [2021-05-06 12:11:39,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:11:39,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:39,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:11:39,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-06 12:11:39,555 INFO L87 Difference]: Start difference. First operand 65 states and 79 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:40,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:40,022 INFO L93 Difference]: Finished difference Result 138 states and 173 transitions. [2021-05-06 12:11:40,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 12:11:40,022 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-06 12:11:40,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:40,023 INFO L225 Difference]: With dead ends: 138 [2021-05-06 12:11:40,023 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 12:11:40,023 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 11 SyntacticMatches, 11 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 595.1ms TimeCoverageRelationStatistics Valid=176, Invalid=330, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:11:40,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 12:11:40,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 68. [2021-05-06 12:11:40,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.234375) internal successors, (79), 64 states have internal predecessors, (79), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:40,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2021-05-06 12:11:40,036 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 52 [2021-05-06 12:11:40,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:40,036 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2021-05-06 12:11:40,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:40,036 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2021-05-06 12:11:40,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:11:40,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:40,037 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:40,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 12:11:40,037 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:40,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:40,037 INFO L82 PathProgramCache]: Analyzing trace with hash 516599449, now seen corresponding path program 5 times [2021-05-06 12:11:40,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:40,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736522150] [2021-05-06 12:11:40,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:40,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:40,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:40,101 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:40,112 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:40,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:40,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:40,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:40,265 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 12:11:40,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:40,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736522150] [2021-05-06 12:11:40,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [736522150] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:40,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:40,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:11:40,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639497397] [2021-05-06 12:11:40,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 12:11:40,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:40,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 12:11:40,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:11:40,590 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:41,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:41,114 INFO L93 Difference]: Finished difference Result 141 states and 176 transitions. [2021-05-06 12:11:41,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 12:11:41,114 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-06 12:11:41,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:41,115 INFO L225 Difference]: With dead ends: 141 [2021-05-06 12:11:41,115 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 12:11:41,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 11 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 685.9ms TimeCoverageRelationStatistics Valid=198, Invalid=402, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:11:41,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 12:11:41,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 71. [2021-05-06 12:11:41,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 67 states have internal predecessors, (82), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:41,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2021-05-06 12:11:41,129 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 55 [2021-05-06 12:11:41,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:41,130 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2021-05-06 12:11:41,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:41,130 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2021-05-06 12:11:41,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 12:11:41,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:41,130 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:41,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 12:11:41,130 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:41,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:41,131 INFO L82 PathProgramCache]: Analyzing trace with hash 646495704, now seen corresponding path program 6 times [2021-05-06 12:11:41,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:41,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775721087] [2021-05-06 12:11:41,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:41,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:41,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:41,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:41,172 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:41,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:41,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:41,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:41,286 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 12:11:41,641 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:41,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775721087] [2021-05-06 12:11:41,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1775721087] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:41,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:41,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:11:41,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604841618] [2021-05-06 12:11:41,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:11:41,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:41,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:11:41,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-05-06 12:11:41,643 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:42,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:42,225 INFO L93 Difference]: Finished difference Result 144 states and 179 transitions. [2021-05-06 12:11:42,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 12:11:42,226 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-06 12:11:42,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:42,226 INFO L225 Difference]: With dead ends: 144 [2021-05-06 12:11:42,226 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 12:11:42,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 11 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 743.1ms TimeCoverageRelationStatistics Valid=220, Invalid=482, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:11:42,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 12:11:42,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 74. [2021-05-06 12:11:42,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 70 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:42,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 88 transitions. [2021-05-06 12:11:42,242 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 88 transitions. Word has length 58 [2021-05-06 12:11:42,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:42,242 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 88 transitions. [2021-05-06 12:11:42,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:42,242 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 88 transitions. [2021-05-06 12:11:42,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 12:11:42,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:42,243 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:42,243 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 12:11:42,243 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:42,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:42,243 INFO L82 PathProgramCache]: Analyzing trace with hash 620294713, now seen corresponding path program 7 times [2021-05-06 12:11:42,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:42,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237988112] [2021-05-06 12:11:42,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:42,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:42,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:42,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:42,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:42,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:42,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:42,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:42,420 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 12:11:42,824 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:42,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237988112] [2021-05-06 12:11:42,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1237988112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:42,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:42,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 12:11:42,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261971161] [2021-05-06 12:11:42,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 12:11:42,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:42,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 12:11:42,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2021-05-06 12:11:42,826 INFO L87 Difference]: Start difference. First operand 74 states and 88 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:43,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:43,464 INFO L93 Difference]: Finished difference Result 147 states and 182 transitions. [2021-05-06 12:11:43,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:11:43,464 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 12:11:43,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:43,465 INFO L225 Difference]: With dead ends: 147 [2021-05-06 12:11:43,465 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 12:11:43,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 11 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 819.3ms TimeCoverageRelationStatistics Valid=242, Invalid=570, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:11:43,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 12:11:43,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 77. [2021-05-06 12:11:43,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 73 states have (on average 1.2054794520547945) internal successors, (88), 73 states have internal predecessors, (88), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:43,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 91 transitions. [2021-05-06 12:11:43,483 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 91 transitions. Word has length 61 [2021-05-06 12:11:43,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:43,483 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 91 transitions. [2021-05-06 12:11:43,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:43,483 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 91 transitions. [2021-05-06 12:11:43,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 12:11:43,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:43,484 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:43,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 12:11:43,484 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:43,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1750619704, now seen corresponding path program 8 times [2021-05-06 12:11:43,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:43,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350397586] [2021-05-06 12:11:43,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:43,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:43,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:43,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:43,527 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:43,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:43,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:43,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:43,664 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 12:11:44,119 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:44,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350397586] [2021-05-06 12:11:44,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1350397586] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:44,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:44,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:11:44,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721655686] [2021-05-06 12:11:44,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:11:44,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:44,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:11:44,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2021-05-06 12:11:44,121 INFO L87 Difference]: Start difference. First operand 77 states and 91 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:44,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:44,846 INFO L93 Difference]: Finished difference Result 150 states and 185 transitions. [2021-05-06 12:11:44,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:11:44,846 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-06 12:11:44,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:44,848 INFO L225 Difference]: With dead ends: 150 [2021-05-06 12:11:44,848 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 12:11:44,848 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 11 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 924.9ms TimeCoverageRelationStatistics Valid=264, Invalid=666, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:11:44,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 12:11:44,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 80. [2021-05-06 12:11:44,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 76 states have (on average 1.1973684210526316) internal successors, (91), 76 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:44,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2021-05-06 12:11:44,866 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 64 [2021-05-06 12:11:44,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:44,866 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2021-05-06 12:11:44,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:44,866 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2021-05-06 12:11:44,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 12:11:44,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:44,867 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:44,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 12:11:44,867 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:44,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:44,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1576141351, now seen corresponding path program 9 times [2021-05-06 12:11:44,867 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:44,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396004246] [2021-05-06 12:11:44,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:44,877 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:44,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:44,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:44,910 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:44,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:45,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:45,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:45,052 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 12:11:45,587 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:45,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396004246] [2021-05-06 12:11:45,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1396004246] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:45,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:45,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:11:45,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557539207] [2021-05-06 12:11:45,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:11:45,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:45,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:11:45,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=232, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:11:45,589 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:46,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:46,442 INFO L93 Difference]: Finished difference Result 153 states and 188 transitions. [2021-05-06 12:11:46,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:11:46,442 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-06 12:11:46,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:46,443 INFO L225 Difference]: With dead ends: 153 [2021-05-06 12:11:46,443 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 12:11:46,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 11 SyntacticMatches, 21 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1011.4ms TimeCoverageRelationStatistics Valid=286, Invalid=770, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:11:46,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 12:11:46,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 83. [2021-05-06 12:11:46,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 79 states have (on average 1.1898734177215189) internal successors, (94), 79 states have internal predecessors, (94), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:46,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2021-05-06 12:11:46,464 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 67 [2021-05-06 12:11:46,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:46,464 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2021-05-06 12:11:46,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:46,464 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2021-05-06 12:11:46,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 12:11:46,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:46,465 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:46,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 12:11:46,465 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:46,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:46,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1550591640, now seen corresponding path program 10 times [2021-05-06 12:11:46,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:46,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399008628] [2021-05-06 12:11:46,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:46,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:46,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:46,508 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:46,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:46,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:46,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:46,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:46,641 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 12:11:47,197 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:47,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399008628] [2021-05-06 12:11:47,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [399008628] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:47,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:47,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:11:47,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710299907] [2021-05-06 12:11:47,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:11:47,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:47,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:11:47,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2021-05-06 12:11:47,199 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:48,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:48,038 INFO L93 Difference]: Finished difference Result 156 states and 191 transitions. [2021-05-06 12:11:48,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:11:48,039 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-06 12:11:48,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:48,039 INFO L225 Difference]: With dead ends: 156 [2021-05-06 12:11:48,040 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 12:11:48,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 11 SyntacticMatches, 23 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1097.6ms TimeCoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:11:48,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 12:11:48,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 86. [2021-05-06 12:11:48,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 82 states have (on average 1.1829268292682926) internal successors, (97), 82 states have internal predecessors, (97), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:48,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2021-05-06 12:11:48,061 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 70 [2021-05-06 12:11:48,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:48,061 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2021-05-06 12:11:48,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:48,061 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2021-05-06 12:11:48,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 12:11:48,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:48,062 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:48,062 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 12:11:48,062 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:48,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:48,062 INFO L82 PathProgramCache]: Analyzing trace with hash 802410873, now seen corresponding path program 11 times [2021-05-06 12:11:48,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:48,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516638725] [2021-05-06 12:11:48,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:48,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:48,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:48,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:48,106 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:48,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:48,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:48,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:48,248 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 12:11:48,887 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:48,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516638725] [2021-05-06 12:11:48,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1516638725] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:48,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:48,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:11:48,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232424969] [2021-05-06 12:11:48,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:11:48,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:48,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:11:48,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:11:48,889 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:49,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:49,854 INFO L93 Difference]: Finished difference Result 159 states and 194 transitions. [2021-05-06 12:11:49,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:11:49,854 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 12:11:49,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:49,855 INFO L225 Difference]: With dead ends: 159 [2021-05-06 12:11:49,855 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 12:11:49,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 11 SyntacticMatches, 25 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1227.1ms TimeCoverageRelationStatistics Valid=330, Invalid=1002, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:11:49,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 12:11:49,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 89. [2021-05-06 12:11:49,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 85 states have (on average 1.1764705882352942) internal successors, (100), 85 states have internal predecessors, (100), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:49,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 103 transitions. [2021-05-06 12:11:49,879 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 103 transitions. Word has length 73 [2021-05-06 12:11:49,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:49,879 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 103 transitions. [2021-05-06 12:11:49,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:49,879 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 103 transitions. [2021-05-06 12:11:49,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 12:11:49,879 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:49,879 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:49,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 12:11:49,879 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:49,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:49,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1665519880, now seen corresponding path program 12 times [2021-05-06 12:11:49,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:49,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139537606] [2021-05-06 12:11:49,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:49,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:49,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:49,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:49,923 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:50,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:50,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:50,032 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 12:11:50,812 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:50,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139537606] [2021-05-06 12:11:50,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [139537606] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:50,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:50,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:11:50,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152808290] [2021-05-06 12:11:50,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:11:50,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:50,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:11:50,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=328, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:11:50,813 INFO L87 Difference]: Start difference. First operand 89 states and 103 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:51,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:51,868 INFO L93 Difference]: Finished difference Result 162 states and 197 transitions. [2021-05-06 12:11:51,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:11:51,868 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-06 12:11:51,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:51,869 INFO L225 Difference]: With dead ends: 162 [2021-05-06 12:11:51,869 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 12:11:51,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 11 SyntacticMatches, 27 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 1361.4ms TimeCoverageRelationStatistics Valid=352, Invalid=1130, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:11:51,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 12:11:51,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 92. [2021-05-06 12:11:51,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 88 states have (on average 1.1704545454545454) internal successors, (103), 88 states have internal predecessors, (103), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:51,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 106 transitions. [2021-05-06 12:11:51,894 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 106 transitions. Word has length 76 [2021-05-06 12:11:51,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:51,895 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 106 transitions. [2021-05-06 12:11:51,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:51,895 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 106 transitions. [2021-05-06 12:11:51,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 12:11:51,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:51,895 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:51,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 12:11:51,895 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:51,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:51,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1754557721, now seen corresponding path program 13 times [2021-05-06 12:11:51,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:51,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412438833] [2021-05-06 12:11:51,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:51,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:51,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:51,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:51,945 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:51,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:52,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:52,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:52,077 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 12:11:52,842 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:52,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412438833] [2021-05-06 12:11:52,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1412438833] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:52,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:52,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:11:52,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143940626] [2021-05-06 12:11:52,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:11:52,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:52,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:11:52,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:11:52,843 INFO L87 Difference]: Start difference. First operand 92 states and 106 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:53,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:53,936 INFO L93 Difference]: Finished difference Result 165 states and 200 transitions. [2021-05-06 12:11:53,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:11:53,936 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-06 12:11:53,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:53,937 INFO L225 Difference]: With dead ends: 165 [2021-05-06 12:11:53,937 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 12:11:53,937 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 11 SyntacticMatches, 29 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 1427.7ms TimeCoverageRelationStatistics Valid=374, Invalid=1266, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:11:53,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 12:11:53,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 95. [2021-05-06 12:11:53,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 91 states have (on average 1.164835164835165) internal successors, (106), 91 states have internal predecessors, (106), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:53,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 109 transitions. [2021-05-06 12:11:53,964 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 109 transitions. Word has length 79 [2021-05-06 12:11:53,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:53,965 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 109 transitions. [2021-05-06 12:11:53,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:53,965 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 109 transitions. [2021-05-06 12:11:53,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 12:11:53,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:53,965 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:53,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 12:11:53,965 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:53,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:53,966 INFO L82 PathProgramCache]: Analyzing trace with hash -222793896, now seen corresponding path program 14 times [2021-05-06 12:11:53,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:53,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419763754] [2021-05-06 12:11:53,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:53,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:53,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:54,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:54,012 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:54,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:54,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:54,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:54,116 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 12:11:54,979 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:54,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419763754] [2021-05-06 12:11:54,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1419763754] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:54,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:54,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:11:54,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324274175] [2021-05-06 12:11:54,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:11:54,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:54,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:11:54,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=402, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:11:54,982 INFO L87 Difference]: Start difference. First operand 95 states and 109 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:56,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:56,141 INFO L93 Difference]: Finished difference Result 168 states and 203 transitions. [2021-05-06 12:11:56,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:11:56,142 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 12:11:56,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:56,144 INFO L225 Difference]: With dead ends: 168 [2021-05-06 12:11:56,144 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 12:11:56,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 11 SyntacticMatches, 31 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1519.9ms TimeCoverageRelationStatistics Valid=396, Invalid=1410, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:11:56,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 12:11:56,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 98. [2021-05-06 12:11:56,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 94 states have (on average 1.1595744680851063) internal successors, (109), 94 states have internal predecessors, (109), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:56,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 112 transitions. [2021-05-06 12:11:56,178 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 112 transitions. Word has length 82 [2021-05-06 12:11:56,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:56,179 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 112 transitions. [2021-05-06 12:11:56,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:56,179 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 112 transitions. [2021-05-06 12:11:56,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 12:11:56,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:56,181 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:56,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 12:11:56,181 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:56,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:56,182 INFO L82 PathProgramCache]: Analyzing trace with hash -2028351303, now seen corresponding path program 15 times [2021-05-06 12:11:56,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:56,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885747303] [2021-05-06 12:11:56,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:56,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:56,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:56,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:56,235 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:56,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:56,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:56,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:56,368 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 12:11:57,306 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:57,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885747303] [2021-05-06 12:11:57,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1885747303] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:57,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:57,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:11:57,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425564145] [2021-05-06 12:11:57,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:11:57,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:57,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:11:57,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:11:57,307 INFO L87 Difference]: Start difference. First operand 98 states and 112 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:58,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:11:58,636 INFO L93 Difference]: Finished difference Result 171 states and 206 transitions. [2021-05-06 12:11:58,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:11:58,637 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 12:11:58,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:11:58,638 INFO L225 Difference]: With dead ends: 171 [2021-05-06 12:11:58,638 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 12:11:58,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 11 SyntacticMatches, 33 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 1696.5ms TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:11:58,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 12:11:58,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 101. [2021-05-06 12:11:58,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 97 states have (on average 1.1546391752577319) internal successors, (112), 97 states have internal predecessors, (112), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:58,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 115 transitions. [2021-05-06 12:11:58,678 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 115 transitions. Word has length 85 [2021-05-06 12:11:58,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:11:58,678 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 115 transitions. [2021-05-06 12:11:58,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:11:58,678 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 115 transitions. [2021-05-06 12:11:58,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 12:11:58,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:11:58,678 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:11:58,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 12:11:58,679 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:11:58,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:11:58,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1218648136, now seen corresponding path program 16 times [2021-05-06 12:11:58,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:11:58,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020705273] [2021-05-06 12:11:58,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:11:58,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:11:58,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:11:58,722 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:11:58,723 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:11:58,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:58,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:11:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:11:58,835 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 12:11:59,833 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:11:59,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020705273] [2021-05-06 12:11:59,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1020705273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:11:59,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:11:59,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:11:59,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415591758] [2021-05-06 12:11:59,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:11:59,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:11:59,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:11:59,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=484, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:11:59,834 INFO L87 Difference]: Start difference. First operand 101 states and 115 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:01,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:01,241 INFO L93 Difference]: Finished difference Result 174 states and 209 transitions. [2021-05-06 12:12:01,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:12:01,242 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2021-05-06 12:12:01,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:01,242 INFO L225 Difference]: With dead ends: 174 [2021-05-06 12:12:01,242 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 12:12:01,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 11 SyntacticMatches, 35 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1785.4ms TimeCoverageRelationStatistics Valid=440, Invalid=1722, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:12:01,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 12:12:01,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 104. [2021-05-06 12:12:01,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 100 states have (on average 1.15) internal successors, (115), 100 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 118 transitions. [2021-05-06 12:12:01,278 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 118 transitions. Word has length 88 [2021-05-06 12:12:01,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:01,278 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 118 transitions. [2021-05-06 12:12:01,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:01,278 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 118 transitions. [2021-05-06 12:12:01,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 12:12:01,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:01,279 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:01,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 12:12:01,279 INFO L428 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:01,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:01,279 INFO L82 PathProgramCache]: Analyzing trace with hash 112065625, now seen corresponding path program 17 times [2021-05-06 12:12:01,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:01,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014124081] [2021-05-06 12:12:01,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:01,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:01,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:01,321 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:01,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:01,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:01,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:01,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:01,442 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 12:12:02,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:02,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014124081] [2021-05-06 12:12:02,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2014124081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:02,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:02,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:12:02,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166237460] [2021-05-06 12:12:02,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:12:02,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:02,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:12:02,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:12:02,498 INFO L87 Difference]: Start difference. First operand 104 states and 118 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:04,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:04,085 INFO L93 Difference]: Finished difference Result 177 states and 212 transitions. [2021-05-06 12:12:04,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:12:04,085 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-06 12:12:04,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:04,086 INFO L225 Difference]: With dead ends: 177 [2021-05-06 12:12:04,086 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 12:12:04,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 11 SyntacticMatches, 37 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1881.7ms TimeCoverageRelationStatistics Valid=462, Invalid=1890, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:12:04,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 12:12:04,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 107. [2021-05-06 12:12:04,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 103 states have (on average 1.145631067961165) internal successors, (118), 103 states have internal predecessors, (118), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:04,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 121 transitions. [2021-05-06 12:12:04,139 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 121 transitions. Word has length 91 [2021-05-06 12:12:04,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:04,139 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 121 transitions. [2021-05-06 12:12:04,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:04,140 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 121 transitions. [2021-05-06 12:12:04,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 12:12:04,140 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:04,140 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:04,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 12:12:04,148 INFO L428 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:04,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:04,148 INFO L82 PathProgramCache]: Analyzing trace with hash 857577496, now seen corresponding path program 18 times [2021-05-06 12:12:04,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:04,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517730995] [2021-05-06 12:12:04,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:04,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:04,199 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:04,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:04,211 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:04,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:04,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:04,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:04,330 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 12:12:05,545 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:05,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517730995] [2021-05-06 12:12:05,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [517730995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:05,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:05,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:12:05,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130143071] [2021-05-06 12:12:05,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:12:05,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:05,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:12:05,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=574, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:12:05,547 INFO L87 Difference]: Start difference. First operand 107 states and 121 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:07,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:07,214 INFO L93 Difference]: Finished difference Result 180 states and 215 transitions. [2021-05-06 12:12:07,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 12:12:07,214 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-06 12:12:07,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:07,215 INFO L225 Difference]: With dead ends: 180 [2021-05-06 12:12:07,215 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 12:12:07,216 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 11 SyntacticMatches, 39 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 2132.3ms TimeCoverageRelationStatistics Valid=484, Invalid=2066, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:12:07,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 12:12:07,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 110. [2021-05-06 12:12:07,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 106 states have (on average 1.1415094339622642) internal successors, (121), 106 states have internal predecessors, (121), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:07,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 124 transitions. [2021-05-06 12:12:07,262 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 124 transitions. Word has length 94 [2021-05-06 12:12:07,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:07,262 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 124 transitions. [2021-05-06 12:12:07,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:07,263 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 124 transitions. [2021-05-06 12:12:07,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 12:12:07,263 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:07,263 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 21, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:07,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 12:12:07,263 INFO L428 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:07,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:07,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1125838841, now seen corresponding path program 19 times [2021-05-06 12:12:07,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:07,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056920976] [2021-05-06 12:12:07,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:07,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:07,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:07,313 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:07,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:07,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:07,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:07,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:07,436 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 12:12:08,959 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:08,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056920976] [2021-05-06 12:12:08,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1056920976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:08,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:08,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:12:08,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728463872] [2021-05-06 12:12:08,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:12:08,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:08,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:12:08,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=622, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:12:08,960 INFO L87 Difference]: Start difference. First operand 110 states and 124 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:10,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:10,582 INFO L93 Difference]: Finished difference Result 183 states and 218 transitions. [2021-05-06 12:12:10,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 12:12:10,583 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 12:12:10,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:10,583 INFO L225 Difference]: With dead ends: 183 [2021-05-06 12:12:10,583 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 12:12:10,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 11 SyntacticMatches, 41 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 2347.0ms TimeCoverageRelationStatistics Valid=506, Invalid=2250, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:12:10,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 12:12:10,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 113. [2021-05-06 12:12:10,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 109 states have (on average 1.1376146788990826) internal successors, (124), 109 states have internal predecessors, (124), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:10,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 127 transitions. [2021-05-06 12:12:10,631 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 127 transitions. Word has length 97 [2021-05-06 12:12:10,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:10,631 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 127 transitions. [2021-05-06 12:12:10,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:10,632 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 127 transitions. [2021-05-06 12:12:10,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 12:12:10,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:10,632 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:10,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 12:12:10,632 INFO L428 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:10,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:10,633 INFO L82 PathProgramCache]: Analyzing trace with hash -34570120, now seen corresponding path program 20 times [2021-05-06 12:12:10,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:10,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562122588] [2021-05-06 12:12:10,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:10,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:10,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:10,680 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:10,681 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:10,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:10,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:10,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:10,836 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 12:12:12,189 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:12,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562122588] [2021-05-06 12:12:12,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1562122588] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:12,190 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:12,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 12:12:12,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006127468] [2021-05-06 12:12:12,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 12:12:12,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:12,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 12:12:12,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:12:12,191 INFO L87 Difference]: Start difference. First operand 113 states and 127 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:13,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:13,957 INFO L93 Difference]: Finished difference Result 186 states and 221 transitions. [2021-05-06 12:12:13,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 12:12:13,958 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-05-06 12:12:13,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:13,958 INFO L225 Difference]: With dead ends: 186 [2021-05-06 12:12:13,958 INFO L226 Difference]: Without dead ends: 140 [2021-05-06 12:12:13,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 11 SyntacticMatches, 43 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 2300.1ms TimeCoverageRelationStatistics Valid=528, Invalid=2442, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:12:13,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-06 12:12:14,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 116. [2021-05-06 12:12:14,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 112 states have (on average 1.1339285714285714) internal successors, (127), 112 states have internal predecessors, (127), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:14,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 130 transitions. [2021-05-06 12:12:14,005 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 130 transitions. Word has length 100 [2021-05-06 12:12:14,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:14,005 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 130 transitions. [2021-05-06 12:12:14,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:14,005 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 130 transitions. [2021-05-06 12:12:14,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 12:12:14,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:14,005 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 23, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:14,006 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 12:12:14,006 INFO L428 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:14,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:14,006 INFO L82 PathProgramCache]: Analyzing trace with hash 413838233, now seen corresponding path program 21 times [2021-05-06 12:12:14,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:14,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579053086] [2021-05-06 12:12:14,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:14,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:14,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:14,052 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:14,053 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:14,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:14,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:14,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:14,197 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 12:12:15,678 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:15,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579053086] [2021-05-06 12:12:15,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [579053086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:15,678 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:15,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 12:12:15,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418182566] [2021-05-06 12:12:15,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 12:12:15,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:15,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 12:12:15,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=724, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:12:15,679 INFO L87 Difference]: Start difference. First operand 116 states and 130 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:17,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:17,670 INFO L93 Difference]: Finished difference Result 189 states and 224 transitions. [2021-05-06 12:12:17,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 12:12:17,675 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 12:12:17,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:17,676 INFO L225 Difference]: With dead ends: 189 [2021-05-06 12:12:17,676 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 12:12:17,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 11 SyntacticMatches, 45 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 2514.8ms TimeCoverageRelationStatistics Valid=550, Invalid=2642, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:12:17,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 12:12:17,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 119. [2021-05-06 12:12:17,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 115 states have (on average 1.1304347826086956) internal successors, (130), 115 states have internal predecessors, (130), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:17,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 133 transitions. [2021-05-06 12:12:17,729 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 133 transitions. Word has length 103 [2021-05-06 12:12:17,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:17,730 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 133 transitions. [2021-05-06 12:12:17,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:17,730 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 133 transitions. [2021-05-06 12:12:17,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-06 12:12:17,752 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:17,753 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 24, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:17,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 12:12:17,753 INFO L428 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:17,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:17,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1598791896, now seen corresponding path program 22 times [2021-05-06 12:12:17,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:17,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677587533] [2021-05-06 12:12:17,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:17,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:17,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:17,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:17,827 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:17,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:17,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:17,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:17,982 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 12:12:20,020 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:20,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677587533] [2021-05-06 12:12:20,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [677587533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:20,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:20,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 12:12:20,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584930627] [2021-05-06 12:12:20,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 12:12:20,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:20,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 12:12:20,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2021-05-06 12:12:20,022 INFO L87 Difference]: Start difference. First operand 119 states and 133 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:22,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:22,048 INFO L93 Difference]: Finished difference Result 192 states and 227 transitions. [2021-05-06 12:12:22,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 12:12:22,051 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 106 [2021-05-06 12:12:22,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:22,051 INFO L225 Difference]: With dead ends: 192 [2021-05-06 12:12:22,051 INFO L226 Difference]: Without dead ends: 146 [2021-05-06 12:12:22,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 11 SyntacticMatches, 47 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 3065.2ms TimeCoverageRelationStatistics Valid=572, Invalid=2850, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 12:12:22,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-06 12:12:22,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 122. [2021-05-06 12:12:22,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 118 states have (on average 1.1271186440677967) internal successors, (133), 118 states have internal predecessors, (133), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:22,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2021-05-06 12:12:22,110 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 106 [2021-05-06 12:12:22,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:22,111 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2021-05-06 12:12:22,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:22,111 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2021-05-06 12:12:22,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 12:12:22,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:22,111 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 25, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:22,111 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 12:12:22,111 INFO L428 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:22,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:22,112 INFO L82 PathProgramCache]: Analyzing trace with hash -2077806791, now seen corresponding path program 23 times [2021-05-06 12:12:22,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:22,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559243137] [2021-05-06 12:12:22,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:22,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:22,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:22,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:22,162 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:22,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:22,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:22,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:22,298 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 12:12:23,856 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:23,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559243137] [2021-05-06 12:12:23,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [559243137] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:23,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:23,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 12:12:23,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746942586] [2021-05-06 12:12:23,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 12:12:23,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:23,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 12:12:23,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 12:12:23,857 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:25,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:25,801 INFO L93 Difference]: Finished difference Result 195 states and 230 transitions. [2021-05-06 12:12:25,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 12:12:25,802 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-06 12:12:25,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:25,802 INFO L225 Difference]: With dead ends: 195 [2021-05-06 12:12:25,802 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 12:12:25,803 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 11 SyntacticMatches, 49 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 2502.3ms TimeCoverageRelationStatistics Valid=594, Invalid=3066, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 12:12:25,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 12:12:25,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 125. [2021-05-06 12:12:25,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 121 states have (on average 1.1239669421487604) internal successors, (136), 121 states have internal predecessors, (136), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:25,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 139 transitions. [2021-05-06 12:12:25,863 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 139 transitions. Word has length 109 [2021-05-06 12:12:25,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:25,864 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 139 transitions. [2021-05-06 12:12:25,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:25,864 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 139 transitions. [2021-05-06 12:12:25,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-06 12:12:25,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:25,864 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 26, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:25,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 12:12:25,864 INFO L428 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:25,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:25,865 INFO L82 PathProgramCache]: Analyzing trace with hash -1373308616, now seen corresponding path program 24 times [2021-05-06 12:12:25,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:25,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306125057] [2021-05-06 12:12:25,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:25,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:25,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:25,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:25,948 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:25,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:26,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:26,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:26,128 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 12:12:27,960 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:27,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306125057] [2021-05-06 12:12:27,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1306125057] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:27,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:27,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 12:12:27,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159607214] [2021-05-06 12:12:27,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 12:12:27,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:27,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 12:12:27,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=892, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 12:12:27,961 INFO L87 Difference]: Start difference. First operand 125 states and 139 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:30,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:30,366 INFO L93 Difference]: Finished difference Result 198 states and 233 transitions. [2021-05-06 12:12:30,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 12:12:30,367 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-05-06 12:12:30,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:30,367 INFO L225 Difference]: With dead ends: 198 [2021-05-06 12:12:30,367 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 12:12:30,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 11 SyntacticMatches, 51 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 3092.3ms TimeCoverageRelationStatistics Valid=616, Invalid=3290, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 12:12:30,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 12:12:30,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 128. [2021-05-06 12:12:30,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 124 states have (on average 1.1209677419354838) internal successors, (139), 124 states have internal predecessors, (139), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:30,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2021-05-06 12:12:30,427 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 112 [2021-05-06 12:12:30,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:30,428 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2021-05-06 12:12:30,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:30,428 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2021-05-06 12:12:30,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 12:12:30,428 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:30,428 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 27, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:30,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 12:12:30,428 INFO L428 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:30,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:30,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1121614553, now seen corresponding path program 25 times [2021-05-06 12:12:30,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:30,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072075691] [2021-05-06 12:12:30,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:30,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:30,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:30,478 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:30,478 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:30,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:30,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:30,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:30,588 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 12:12:32,405 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:32,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072075691] [2021-05-06 12:12:32,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2072075691] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:32,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:32,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 12:12:32,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29112251] [2021-05-06 12:12:32,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 12:12:32,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:32,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 12:12:32,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=952, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:12:32,406 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:34,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:34,854 INFO L93 Difference]: Finished difference Result 201 states and 236 transitions. [2021-05-06 12:12:34,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 12:12:34,854 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 12:12:34,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:34,855 INFO L225 Difference]: With dead ends: 201 [2021-05-06 12:12:34,855 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 12:12:34,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 11 SyntacticMatches, 53 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 2952.0ms TimeCoverageRelationStatistics Valid=638, Invalid=3522, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 12:12:34,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 12:12:34,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 131. [2021-05-06 12:12:34,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 127 states have (on average 1.1181102362204725) internal successors, (142), 127 states have internal predecessors, (142), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:34,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2021-05-06 12:12:34,929 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 115 [2021-05-06 12:12:34,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:34,930 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2021-05-06 12:12:34,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:34,930 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2021-05-06 12:12:34,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 12:12:34,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:34,930 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 28, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:34,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 12:12:34,930 INFO L428 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:34,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:34,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1326282344, now seen corresponding path program 26 times [2021-05-06 12:12:34,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:34,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397950144] [2021-05-06 12:12:34,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:34,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:34,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:34,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:34,988 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:35,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:35,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:35,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:35,133 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 12:12:37,168 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:37,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397950144] [2021-05-06 12:12:37,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [397950144] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:37,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:37,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 12:12:37,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325993419] [2021-05-06 12:12:37,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 12:12:37,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:37,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 12:12:37,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1014, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 12:12:37,170 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:39,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:39,967 INFO L93 Difference]: Finished difference Result 204 states and 239 transitions. [2021-05-06 12:12:39,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 12:12:39,968 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 118 [2021-05-06 12:12:39,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:39,968 INFO L225 Difference]: With dead ends: 204 [2021-05-06 12:12:39,968 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 12:12:39,969 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 11 SyntacticMatches, 55 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 3298.9ms TimeCoverageRelationStatistics Valid=660, Invalid=3762, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 12:12:39,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 12:12:40,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 134. [2021-05-06 12:12:40,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 130 states have (on average 1.1153846153846154) internal successors, (145), 130 states have internal predecessors, (145), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:40,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 148 transitions. [2021-05-06 12:12:40,037 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 148 transitions. Word has length 118 [2021-05-06 12:12:40,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:40,037 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 148 transitions. [2021-05-06 12:12:40,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:40,037 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 148 transitions. [2021-05-06 12:12:40,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 12:12:40,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:40,038 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 29, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:40,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 12:12:40,038 INFO L428 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:40,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:40,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1921945209, now seen corresponding path program 27 times [2021-05-06 12:12:40,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:40,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113030735] [2021-05-06 12:12:40,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:40,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:40,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:40,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:40,108 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:40,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:40,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:40,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:40,264 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 12:12:42,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:42,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113030735] [2021-05-06 12:12:42,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1113030735] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:42,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:42,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 12:12:42,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618219657] [2021-05-06 12:12:42,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 12:12:42,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:42,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 12:12:42,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1078, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:12:42,506 INFO L87 Difference]: Start difference. First operand 134 states and 148 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:44,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:44,948 INFO L93 Difference]: Finished difference Result 207 states and 242 transitions. [2021-05-06 12:12:44,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 12:12:44,948 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-06 12:12:44,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:44,949 INFO L225 Difference]: With dead ends: 207 [2021-05-06 12:12:44,949 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 12:12:44,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 11 SyntacticMatches, 57 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 3356.8ms TimeCoverageRelationStatistics Valid=682, Invalid=4010, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 12:12:44,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 12:12:45,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 137. [2021-05-06 12:12:45,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 133 states have (on average 1.112781954887218) internal successors, (148), 133 states have internal predecessors, (148), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:45,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 151 transitions. [2021-05-06 12:12:45,026 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 151 transitions. Word has length 121 [2021-05-06 12:12:45,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:45,026 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 151 transitions. [2021-05-06 12:12:45,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:45,026 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 151 transitions. [2021-05-06 12:12:45,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-06 12:12:45,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:45,027 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 30, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:45,027 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 12:12:45,027 INFO L428 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:45,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:45,027 INFO L82 PathProgramCache]: Analyzing trace with hash -39169544, now seen corresponding path program 28 times [2021-05-06 12:12:45,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:45,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478477340] [2021-05-06 12:12:45,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:45,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:45,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:45,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:45,080 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:45,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:45,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:45,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:45,201 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 12:12:47,306 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:47,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478477340] [2021-05-06 12:12:47,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [478477340] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:47,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:47,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 12:12:47,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431912809] [2021-05-06 12:12:47,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 12:12:47,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:47,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 12:12:47,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1144, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 12:12:47,312 INFO L87 Difference]: Start difference. First operand 137 states and 151 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:50,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:50,168 INFO L93 Difference]: Finished difference Result 210 states and 245 transitions. [2021-05-06 12:12:50,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 12:12:50,169 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-05-06 12:12:50,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:50,171 INFO L225 Difference]: With dead ends: 210 [2021-05-06 12:12:50,172 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 12:12:50,173 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 11 SyntacticMatches, 59 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 3475.2ms TimeCoverageRelationStatistics Valid=704, Invalid=4266, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 12:12:50,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 12:12:50,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 140. [2021-05-06 12:12:50,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 136 states have (on average 1.1102941176470589) internal successors, (151), 136 states have internal predecessors, (151), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:50,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 154 transitions. [2021-05-06 12:12:50,251 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 154 transitions. Word has length 124 [2021-05-06 12:12:50,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:50,251 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 154 transitions. [2021-05-06 12:12:50,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:50,252 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 154 transitions. [2021-05-06 12:12:50,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 12:12:50,252 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:50,252 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 31, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:50,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 12:12:50,252 INFO L428 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:50,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:50,252 INFO L82 PathProgramCache]: Analyzing trace with hash 831351321, now seen corresponding path program 29 times [2021-05-06 12:12:50,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:50,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392499000] [2021-05-06 12:12:50,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:50,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:50,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:50,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:50,312 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:50,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:50,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:50,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:50,520 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 12:12:53,052 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:53,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392499000] [2021-05-06 12:12:53,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1392499000] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:53,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:53,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 12:12:53,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85344460] [2021-05-06 12:12:53,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 12:12:53,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:53,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 12:12:53,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1212, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:12:53,054 INFO L87 Difference]: Start difference. First operand 140 states and 154 transitions. Second operand has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:56,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:56,441 INFO L93 Difference]: Finished difference Result 213 states and 248 transitions. [2021-05-06 12:12:56,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 12:12:56,441 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 127 [2021-05-06 12:12:56,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:56,442 INFO L225 Difference]: With dead ends: 213 [2021-05-06 12:12:56,442 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 12:12:56,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 11 SyntacticMatches, 61 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 894 ImplicationChecksByTransitivity, 4125.4ms TimeCoverageRelationStatistics Valid=726, Invalid=4530, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 12:12:56,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 12:12:56,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 143. [2021-05-06 12:12:56,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 139 states have (on average 1.1079136690647482) internal successors, (154), 139 states have internal predecessors, (154), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:56,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 157 transitions. [2021-05-06 12:12:56,524 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 157 transitions. Word has length 127 [2021-05-06 12:12:56,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:56,525 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 157 transitions. [2021-05-06 12:12:56,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:12:56,525 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 157 transitions. [2021-05-06 12:12:56,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 12:12:56,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:56,525 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 32, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:56,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 12:12:56,526 INFO L428 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:56,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:56,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1505907288, now seen corresponding path program 30 times [2021-05-06 12:12:56,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:56,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969515326] [2021-05-06 12:12:56,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:56,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:56,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:12:56,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:56,579 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:56,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:56,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:56,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:56,736 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 12:12:59,282 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:59,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969515326] [2021-05-06 12:12:59,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [969515326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:59,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:59,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 12:12:59,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355004970] [2021-05-06 12:12:59,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 12:12:59,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:59,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 12:12:59,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=1282, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 12:12:59,283 INFO L87 Difference]: Start difference. First operand 143 states and 157 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:02,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:02,622 INFO L93 Difference]: Finished difference Result 216 states and 251 transitions. [2021-05-06 12:13:02,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 12:13:02,622 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-05-06 12:13:02,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:02,630 INFO L225 Difference]: With dead ends: 216 [2021-05-06 12:13:02,630 INFO L226 Difference]: Without dead ends: 170 [2021-05-06 12:13:02,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 11 SyntacticMatches, 63 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 939 ImplicationChecksByTransitivity, 4124.2ms TimeCoverageRelationStatistics Valid=748, Invalid=4802, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 12:13:02,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-06 12:13:02,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 146. [2021-05-06 12:13:02,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 142 states have (on average 1.1056338028169015) internal successors, (157), 142 states have internal predecessors, (157), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:02,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 160 transitions. [2021-05-06 12:13:02,737 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 160 transitions. Word has length 130 [2021-05-06 12:13:02,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:02,738 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 160 transitions. [2021-05-06 12:13:02,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:02,738 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 160 transitions. [2021-05-06 12:13:02,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 12:13:02,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:02,738 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 33, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:02,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 12:13:02,738 INFO L428 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:02,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:02,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1050742201, now seen corresponding path program 31 times [2021-05-06 12:13:02,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:02,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143626853] [2021-05-06 12:13:02,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:02,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:02,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:02,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:02,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:02,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:02,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:02,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:02,924 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 12:13:05,441 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:05,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143626853] [2021-05-06 12:13:05,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [143626853] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:05,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:05,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 12:13:05,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755779417] [2021-05-06 12:13:05,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 12:13:05,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:05,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 12:13:05,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1354, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:13:05,442 INFO L87 Difference]: Start difference. First operand 146 states and 160 transitions. Second operand has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:09,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:09,081 INFO L93 Difference]: Finished difference Result 219 states and 254 transitions. [2021-05-06 12:13:09,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 12:13:09,082 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 12:13:09,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:09,083 INFO L225 Difference]: With dead ends: 219 [2021-05-06 12:13:09,083 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 12:13:09,083 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 11 SyntacticMatches, 65 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 4144.4ms TimeCoverageRelationStatistics Valid=770, Invalid=5082, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 12:13:09,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 12:13:09,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-05-06 12:13:09,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 145 states have (on average 1.103448275862069) internal successors, (160), 145 states have internal predecessors, (160), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:09,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 163 transitions. [2021-05-06 12:13:09,170 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 163 transitions. Word has length 133 [2021-05-06 12:13:09,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:09,170 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 163 transitions. [2021-05-06 12:13:09,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:09,171 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 163 transitions. [2021-05-06 12:13:09,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-05-06 12:13:09,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:09,171 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 34, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:09,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 12:13:09,171 INFO L428 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:09,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:09,172 INFO L82 PathProgramCache]: Analyzing trace with hash 439388856, now seen corresponding path program 32 times [2021-05-06 12:13:09,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:09,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363983852] [2021-05-06 12:13:09,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:09,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:09,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:09,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:09,227 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:09,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:09,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:09,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:09,352 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 12:13:12,207 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:12,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363983852] [2021-05-06 12:13:12,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [363983852] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:12,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:12,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 12:13:12,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724846481] [2021-05-06 12:13:12,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 12:13:12,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:12,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 12:13:12,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1428, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 12:13:12,208 INFO L87 Difference]: Start difference. First operand 149 states and 163 transitions. Second operand has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:15,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:15,667 INFO L93 Difference]: Finished difference Result 222 states and 257 transitions. [2021-05-06 12:13:15,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 12:13:15,668 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 136 [2021-05-06 12:13:15,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:15,668 INFO L225 Difference]: With dead ends: 222 [2021-05-06 12:13:15,668 INFO L226 Difference]: Without dead ends: 176 [2021-05-06 12:13:15,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 11 SyntacticMatches, 67 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 4431.0ms TimeCoverageRelationStatistics Valid=792, Invalid=5370, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 12:13:15,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-06 12:13:15,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 152. [2021-05-06 12:13:15,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 148 states have (on average 1.1013513513513513) internal successors, (163), 148 states have internal predecessors, (163), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:15,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2021-05-06 12:13:15,926 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 136 [2021-05-06 12:13:15,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:15,926 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2021-05-06 12:13:15,926 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:15,926 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2021-05-06 12:13:15,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-06 12:13:15,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:15,927 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 35, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:15,927 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 12:13:15,927 INFO L428 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:15,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:15,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1726776999, now seen corresponding path program 33 times [2021-05-06 12:13:15,928 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:15,928 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029741204] [2021-05-06 12:13:15,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:15,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:16,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:16,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:16,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:16,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:16,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:16,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:16,127 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 12:13:19,056 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:19,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029741204] [2021-05-06 12:13:19,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1029741204] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:19,056 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:19,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 12:13:19,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653735980] [2021-05-06 12:13:19,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 12:13:19,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:19,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 12:13:19,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1504, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:13:19,058 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:23,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:23,077 INFO L93 Difference]: Finished difference Result 225 states and 260 transitions. [2021-05-06 12:13:23,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 12:13:23,078 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-06 12:13:23,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:23,078 INFO L225 Difference]: With dead ends: 225 [2021-05-06 12:13:23,078 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 12:13:23,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 11 SyntacticMatches, 69 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 4727.6ms TimeCoverageRelationStatistics Valid=814, Invalid=5666, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 12:13:23,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 12:13:23,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 155. [2021-05-06 12:13:23,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 151 states have (on average 1.099337748344371) internal successors, (166), 151 states have internal predecessors, (166), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:23,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 169 transitions. [2021-05-06 12:13:23,183 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 169 transitions. Word has length 139 [2021-05-06 12:13:23,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:23,183 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 169 transitions. [2021-05-06 12:13:23,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:23,183 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 169 transitions. [2021-05-06 12:13:23,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-05-06 12:13:23,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:23,184 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 36, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:23,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 12:13:23,184 INFO L428 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:23,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:23,184 INFO L82 PathProgramCache]: Analyzing trace with hash -2090140904, now seen corresponding path program 34 times [2021-05-06 12:13:23,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:23,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516327499] [2021-05-06 12:13:23,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:23,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:23,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:23,235 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:23,236 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:23,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:23,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:23,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:23,402 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 12:13:26,235 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:26,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516327499] [2021-05-06 12:13:26,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1516327499] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:26,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:26,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 12:13:26,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152475089] [2021-05-06 12:13:26,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 12:13:26,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:26,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 12:13:26,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=1582, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 12:13:26,236 INFO L87 Difference]: Start difference. First operand 155 states and 169 transitions. Second operand has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:30,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:30,083 INFO L93 Difference]: Finished difference Result 228 states and 263 transitions. [2021-05-06 12:13:30,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 12:13:30,083 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 142 [2021-05-06 12:13:30,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:30,084 INFO L225 Difference]: With dead ends: 228 [2021-05-06 12:13:30,084 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 12:13:30,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 11 SyntacticMatches, 71 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 4582.2ms TimeCoverageRelationStatistics Valid=836, Invalid=5970, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 12:13:30,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 12:13:30,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 158. [2021-05-06 12:13:30,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 154 states have (on average 1.0974025974025974) internal successors, (169), 154 states have internal predecessors, (169), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:30,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 172 transitions. [2021-05-06 12:13:30,194 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 172 transitions. Word has length 142 [2021-05-06 12:13:30,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:30,194 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 172 transitions. [2021-05-06 12:13:30,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:30,209 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 172 transitions. [2021-05-06 12:13:30,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 12:13:30,209 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:30,209 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 37, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:30,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 12:13:30,209 INFO L428 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:30,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:30,210 INFO L82 PathProgramCache]: Analyzing trace with hash 548318457, now seen corresponding path program 35 times [2021-05-06 12:13:30,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:30,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920069000] [2021-05-06 12:13:30,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:30,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:30,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:30,266 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:30,267 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:30,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:30,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:30,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:30,366 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 12:13:33,313 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:33,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920069000] [2021-05-06 12:13:33,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [920069000] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:33,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:33,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 12:13:33,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111758298] [2021-05-06 12:13:33,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 12:13:33,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:33,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 12:13:33,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1662, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:13:33,314 INFO L87 Difference]: Start difference. First operand 158 states and 172 transitions. Second operand has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:37,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:37,397 INFO L93 Difference]: Finished difference Result 231 states and 266 transitions. [2021-05-06 12:13:37,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 12:13:37,397 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-06 12:13:37,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:37,398 INFO L225 Difference]: With dead ends: 231 [2021-05-06 12:13:37,398 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 12:13:37,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 11 SyntacticMatches, 73 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1179 ImplicationChecksByTransitivity, 4753.4ms TimeCoverageRelationStatistics Valid=858, Invalid=6282, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 12:13:37,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 12:13:37,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 161. [2021-05-06 12:13:37,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 157 states have (on average 1.0955414012738853) internal successors, (172), 157 states have internal predecessors, (172), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:37,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 175 transitions. [2021-05-06 12:13:37,507 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 175 transitions. Word has length 145 [2021-05-06 12:13:37,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:37,507 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 175 transitions. [2021-05-06 12:13:37,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:37,507 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 175 transitions. [2021-05-06 12:13:37,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-06 12:13:37,507 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:37,507 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 38, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:37,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 12:13:37,508 INFO L428 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:37,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:37,508 INFO L82 PathProgramCache]: Analyzing trace with hash 694657912, now seen corresponding path program 36 times [2021-05-06 12:13:37,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:37,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423530995] [2021-05-06 12:13:37,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:37,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:37,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:37,563 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:37,564 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:37,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:37,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:37,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:37,682 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 12:13:41,800 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:41,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423530995] [2021-05-06 12:13:41,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [423530995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:41,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:41,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 12:13:41,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961045082] [2021-05-06 12:13:41,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 12:13:41,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:41,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 12:13:41,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1744, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 12:13:41,801 INFO L87 Difference]: Start difference. First operand 161 states and 175 transitions. Second operand has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:46,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:46,424 INFO L93 Difference]: Finished difference Result 234 states and 269 transitions. [2021-05-06 12:13:46,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 12:13:46,424 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 148 [2021-05-06 12:13:46,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:46,425 INFO L225 Difference]: With dead ends: 234 [2021-05-06 12:13:46,425 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 12:13:46,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 11 SyntacticMatches, 75 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 6134.2ms TimeCoverageRelationStatistics Valid=880, Invalid=6602, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 12:13:46,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 12:13:46,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 164. [2021-05-06 12:13:46,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 160 states have (on average 1.09375) internal successors, (175), 160 states have internal predecessors, (175), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:46,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 178 transitions. [2021-05-06 12:13:46,560 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 178 transitions. Word has length 148 [2021-05-06 12:13:46,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:46,560 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 178 transitions. [2021-05-06 12:13:46,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:46,561 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 178 transitions. [2021-05-06 12:13:46,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 12:13:46,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:46,561 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 39, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:46,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 12:13:46,561 INFO L428 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:46,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:46,562 INFO L82 PathProgramCache]: Analyzing trace with hash 901556377, now seen corresponding path program 37 times [2021-05-06 12:13:46,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:46,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815059622] [2021-05-06 12:13:46,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:46,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:46,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:46,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:46,662 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:46,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:46,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:46,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:46,771 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 12:13:50,416 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:50,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815059622] [2021-05-06 12:13:50,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1815059622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:50,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:50,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 12:13:50,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536484884] [2021-05-06 12:13:50,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 12:13:50,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:50,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 12:13:50,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1828, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:13:50,417 INFO L87 Difference]: Start difference. First operand 164 states and 178 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:55,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:13:55,091 INFO L93 Difference]: Finished difference Result 237 states and 272 transitions. [2021-05-06 12:13:55,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 12:13:55,091 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-06 12:13:55,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:13:55,092 INFO L225 Difference]: With dead ends: 237 [2021-05-06 12:13:55,092 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 12:13:55,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 11 SyntacticMatches, 77 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1282 ImplicationChecksByTransitivity, 5714.4ms TimeCoverageRelationStatistics Valid=902, Invalid=6930, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 12:13:55,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 12:13:55,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 167. [2021-05-06 12:13:55,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 163 states have (on average 1.0920245398773005) internal successors, (178), 163 states have internal predecessors, (178), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:55,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 181 transitions. [2021-05-06 12:13:55,226 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 181 transitions. Word has length 151 [2021-05-06 12:13:55,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:13:55,226 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 181 transitions. [2021-05-06 12:13:55,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:13:55,226 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 181 transitions. [2021-05-06 12:13:55,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-06 12:13:55,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:13:55,227 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 40, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:13:55,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 12:13:55,227 INFO L428 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:13:55,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:13:55,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1335657432, now seen corresponding path program 38 times [2021-05-06 12:13:55,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:13:55,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992643211] [2021-05-06 12:13:55,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:13:55,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:13:55,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:13:55,293 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:13:55,294 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:13:55,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:55,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:13:55,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:13:55,397 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 12:13:58,930 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:58,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992643211] [2021-05-06 12:13:58,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1992643211] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:58,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:58,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 12:13:58,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684692805] [2021-05-06 12:13:58,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 12:13:58,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:58,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 12:13:58,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1914, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 12:13:58,931 INFO L87 Difference]: Start difference. First operand 167 states and 181 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:03,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:03,572 INFO L93 Difference]: Finished difference Result 240 states and 275 transitions. [2021-05-06 12:14:03,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 12:14:03,572 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 154 [2021-05-06 12:14:03,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:03,573 INFO L225 Difference]: With dead ends: 240 [2021-05-06 12:14:03,573 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 12:14:03,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 11 SyntacticMatches, 79 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1335 ImplicationChecksByTransitivity, 5466.4ms TimeCoverageRelationStatistics Valid=924, Invalid=7266, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 12:14:03,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 12:14:03,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 170. [2021-05-06 12:14:03,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 166 states have (on average 1.0903614457831325) internal successors, (181), 166 states have internal predecessors, (181), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:03,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 184 transitions. [2021-05-06 12:14:03,699 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 184 transitions. Word has length 154 [2021-05-06 12:14:03,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:03,699 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 184 transitions. [2021-05-06 12:14:03,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:03,699 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 184 transitions. [2021-05-06 12:14:03,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 12:14:03,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:03,700 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 41, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:03,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 12:14:03,700 INFO L428 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:03,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:03,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1493658681, now seen corresponding path program 39 times [2021-05-06 12:14:03,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:03,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512763058] [2021-05-06 12:14:03,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:03,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:03,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:03,759 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:03,760 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:03,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:03,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:03,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:03,877 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 12:14:07,956 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:07,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512763058] [2021-05-06 12:14:07,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1512763058] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:07,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:07,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 12:14:07,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721458301] [2021-05-06 12:14:07,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 12:14:07,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:07,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 12:14:07,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=2002, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:14:07,957 INFO L87 Difference]: Start difference. First operand 170 states and 184 transitions. Second operand has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:13,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:13,052 INFO L93 Difference]: Finished difference Result 243 states and 278 transitions. [2021-05-06 12:14:13,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 12:14:13,053 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-05-06 12:14:13,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:13,053 INFO L225 Difference]: With dead ends: 243 [2021-05-06 12:14:13,053 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 12:14:13,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 11 SyntacticMatches, 81 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 6250.2ms TimeCoverageRelationStatistics Valid=946, Invalid=7610, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 12:14:13,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 12:14:13,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 173. [2021-05-06 12:14:13,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 169 states have (on average 1.0887573964497042) internal successors, (184), 169 states have internal predecessors, (184), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:13,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 187 transitions. [2021-05-06 12:14:13,176 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 187 transitions. Word has length 157 [2021-05-06 12:14:13,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:13,176 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 187 transitions. [2021-05-06 12:14:13,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:13,176 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 187 transitions. [2021-05-06 12:14:13,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-06 12:14:13,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:13,177 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 42, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:13,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 12:14:13,177 INFO L428 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:13,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:13,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1224711224, now seen corresponding path program 40 times [2021-05-06 12:14:13,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:13,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392839768] [2021-05-06 12:14:13,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:13,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:13,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:13,236 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:13,237 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:13,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:13,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:13,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:13,345 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 12:14:16,980 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:16,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392839768] [2021-05-06 12:14:16,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [392839768] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:16,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:16,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 12:14:16,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377853013] [2021-05-06 12:14:16,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 12:14:16,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:16,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 12:14:16,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2092, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 12:14:16,982 INFO L87 Difference]: Start difference. First operand 173 states and 187 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:22,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:22,022 INFO L93 Difference]: Finished difference Result 246 states and 281 transitions. [2021-05-06 12:14:22,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 12:14:22,023 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-05-06 12:14:22,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:22,023 INFO L225 Difference]: With dead ends: 246 [2021-05-06 12:14:22,023 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 12:14:22,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 11 SyntacticMatches, 83 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1444 ImplicationChecksByTransitivity, 5654.0ms TimeCoverageRelationStatistics Valid=968, Invalid=7962, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 12:14:22,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 12:14:22,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 176. [2021-05-06 12:14:22,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 172 states have (on average 1.0872093023255813) internal successors, (187), 172 states have internal predecessors, (187), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:22,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 190 transitions. [2021-05-06 12:14:22,164 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 190 transitions. Word has length 160 [2021-05-06 12:14:22,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:22,164 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 190 transitions. [2021-05-06 12:14:22,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:22,164 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 190 transitions. [2021-05-06 12:14:22,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 12:14:22,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:22,172 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 43, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:22,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 12:14:22,173 INFO L428 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:22,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash -874973223, now seen corresponding path program 41 times [2021-05-06 12:14:22,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:22,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66321144] [2021-05-06 12:14:22,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:22,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:22,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:22,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:22,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:22,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:22,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:22,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:22,396 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 12:14:26,475 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:26,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66321144] [2021-05-06 12:14:26,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [66321144] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:26,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:26,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 12:14:26,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213641650] [2021-05-06 12:14:26,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 12:14:26,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:26,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 12:14:26,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2184, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:14:26,477 INFO L87 Difference]: Start difference. First operand 176 states and 190 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:31,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:31,812 INFO L93 Difference]: Finished difference Result 249 states and 284 transitions. [2021-05-06 12:14:31,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 12:14:31,812 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 163 [2021-05-06 12:14:31,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:31,813 INFO L225 Difference]: With dead ends: 249 [2021-05-06 12:14:31,813 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 12:14:31,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 11 SyntacticMatches, 85 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1500 ImplicationChecksByTransitivity, 6382.4ms TimeCoverageRelationStatistics Valid=990, Invalid=8322, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 12:14:31,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 12:14:31,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 179. [2021-05-06 12:14:31,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 175 states have (on average 1.0857142857142856) internal successors, (190), 175 states have internal predecessors, (190), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:31,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 193 transitions. [2021-05-06 12:14:31,954 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 193 transitions. Word has length 163 [2021-05-06 12:14:31,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:31,954 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 193 transitions. [2021-05-06 12:14:31,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:31,954 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 193 transitions. [2021-05-06 12:14:31,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-05-06 12:14:31,954 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:31,955 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 44, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:31,955 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 12:14:31,955 INFO L428 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:31,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:31,955 INFO L82 PathProgramCache]: Analyzing trace with hash -670634856, now seen corresponding path program 42 times [2021-05-06 12:14:31,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:31,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115910219] [2021-05-06 12:14:31,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:31,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:32,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:32,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:32,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:32,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:32,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:32,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:32,109 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 12:14:36,433 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:36,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115910219] [2021-05-06 12:14:36,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [115910219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:36,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:36,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 12:14:36,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661441917] [2021-05-06 12:14:36,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 12:14:36,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:36,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 12:14:36,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=2278, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:14:36,435 INFO L87 Difference]: Start difference. First operand 179 states and 193 transitions. Second operand has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:42,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:42,191 INFO L93 Difference]: Finished difference Result 252 states and 287 transitions. [2021-05-06 12:14:42,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 12:14:42,191 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 166 [2021-05-06 12:14:42,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:42,192 INFO L225 Difference]: With dead ends: 252 [2021-05-06 12:14:42,192 INFO L226 Difference]: Without dead ends: 206 [2021-05-06 12:14:42,193 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 11 SyntacticMatches, 87 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 6813.2ms TimeCoverageRelationStatistics Valid=1012, Invalid=8690, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 12:14:42,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-06 12:14:42,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 182. [2021-05-06 12:14:42,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 178 states have (on average 1.0842696629213484) internal successors, (193), 178 states have internal predecessors, (193), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:42,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 196 transitions. [2021-05-06 12:14:42,372 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 196 transitions. Word has length 166 [2021-05-06 12:14:42,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:42,372 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 196 transitions. [2021-05-06 12:14:42,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:42,373 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 196 transitions. [2021-05-06 12:14:42,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 12:14:42,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:42,373 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 45, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:42,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 12:14:42,373 INFO L428 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:42,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:42,374 INFO L82 PathProgramCache]: Analyzing trace with hash 804998009, now seen corresponding path program 43 times [2021-05-06 12:14:42,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:42,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394995793] [2021-05-06 12:14:42,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:42,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:42,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:42,436 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:42,437 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:42,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:42,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:42,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:42,565 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 12:14:46,952 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:46,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394995793] [2021-05-06 12:14:46,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1394995793] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:46,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:46,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 12:14:46,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514705076] [2021-05-06 12:14:46,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 12:14:46,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:46,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 12:14:46,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2374, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 12:14:46,953 INFO L87 Difference]: Start difference. First operand 182 states and 196 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:52,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:52,750 INFO L93 Difference]: Finished difference Result 255 states and 290 transitions. [2021-05-06 12:14:52,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 12:14:52,750 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 169 [2021-05-06 12:14:52,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:52,751 INFO L225 Difference]: With dead ends: 255 [2021-05-06 12:14:52,751 INFO L226 Difference]: Without dead ends: 209 [2021-05-06 12:14:52,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 11 SyntacticMatches, 89 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1615 ImplicationChecksByTransitivity, 6855.1ms TimeCoverageRelationStatistics Valid=1034, Invalid=9066, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 12:14:52,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-06 12:14:52,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 185. [2021-05-06 12:14:52,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 181 states have (on average 1.0828729281767955) internal successors, (196), 181 states have internal predecessors, (196), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:52,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 199 transitions. [2021-05-06 12:14:52,911 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 199 transitions. Word has length 169 [2021-05-06 12:14:52,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:52,912 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 199 transitions. [2021-05-06 12:14:52,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:14:52,912 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 199 transitions. [2021-05-06 12:14:52,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-05-06 12:14:52,912 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:52,912 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 46, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:52,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 12:14:52,913 INFO L428 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:52,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:52,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1901562632, now seen corresponding path program 44 times [2021-05-06 12:14:52,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:52,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223081423] [2021-05-06 12:14:52,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:52,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:52,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:14:52,972 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:52,973 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:52,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:53,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:53,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:53,105 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 12:14:57,748 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:57,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223081423] [2021-05-06 12:14:57,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [223081423] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:57,749 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:57,749 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 12:14:57,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640092692] [2021-05-06 12:14:57,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 12:14:57,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:57,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 12:14:57,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=2472, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 12:14:57,750 INFO L87 Difference]: Start difference. First operand 185 states and 199 transitions. Second operand has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:03,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:03,676 INFO L93 Difference]: Finished difference Result 258 states and 293 transitions. [2021-05-06 12:15:03,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 12:15:03,677 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-05-06 12:15:03,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:03,677 INFO L225 Difference]: With dead ends: 258 [2021-05-06 12:15:03,677 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 12:15:03,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 11 SyntacticMatches, 91 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1674 ImplicationChecksByTransitivity, 7133.2ms TimeCoverageRelationStatistics Valid=1056, Invalid=9450, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 12:15:03,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 12:15:03,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 188. [2021-05-06 12:15:03,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 184 states have (on average 1.0815217391304348) internal successors, (199), 184 states have internal predecessors, (199), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:03,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 202 transitions. [2021-05-06 12:15:03,915 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 202 transitions. Word has length 172 [2021-05-06 12:15:03,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:03,915 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 202 transitions. [2021-05-06 12:15:03,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:03,916 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 202 transitions. [2021-05-06 12:15:03,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-06 12:15:03,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:03,916 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 47, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:03,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 12:15:03,916 INFO L428 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:03,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:03,917 INFO L82 PathProgramCache]: Analyzing trace with hash 666396441, now seen corresponding path program 45 times [2021-05-06 12:15:03,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:03,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186025856] [2021-05-06 12:15:03,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:03,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:03,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:15:03,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:03,994 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:04,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:04,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:04,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:04,138 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 12:15:09,874 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:09,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186025856] [2021-05-06 12:15:09,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1186025856] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:09,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:09,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 12:15:09,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863400468] [2021-05-06 12:15:09,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 12:15:09,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:09,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 12:15:09,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=2572, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 12:15:09,875 INFO L87 Difference]: Start difference. First operand 188 states and 202 transitions. Second operand has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:16,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:16,627 INFO L93 Difference]: Finished difference Result 261 states and 296 transitions. [2021-05-06 12:15:16,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 12:15:16,627 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 175 [2021-05-06 12:15:16,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:16,628 INFO L225 Difference]: With dead ends: 261 [2021-05-06 12:15:16,628 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 12:15:16,629 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 11 SyntacticMatches, 93 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1734 ImplicationChecksByTransitivity, 8567.4ms TimeCoverageRelationStatistics Valid=1078, Invalid=9842, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 12:15:16,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 12:15:16,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 191. [2021-05-06 12:15:16,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 187 states have (on average 1.0802139037433156) internal successors, (202), 187 states have internal predecessors, (202), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:16,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 205 transitions. [2021-05-06 12:15:16,804 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 205 transitions. Word has length 175 [2021-05-06 12:15:16,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:16,804 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 205 transitions. [2021-05-06 12:15:16,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:16,804 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 205 transitions. [2021-05-06 12:15:16,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-05-06 12:15:16,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:16,805 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 48, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:16,805 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 12:15:16,805 INFO L428 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:16,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:16,805 INFO L82 PathProgramCache]: Analyzing trace with hash 777663832, now seen corresponding path program 46 times [2021-05-06 12:15:16,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:16,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403296324] [2021-05-06 12:15:16,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:16,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:16,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:15:16,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:16,880 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:16,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:17,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:17,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:17,070 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 12:15:22,800 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:22,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403296324] [2021-05-06 12:15:22,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1403296324] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:22,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:22,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 12:15:22,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181787510] [2021-05-06 12:15:22,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 12:15:22,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:22,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 12:15:22,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=2674, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 12:15:22,802 INFO L87 Difference]: Start difference. First operand 191 states and 205 transitions. Second operand has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:29,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:29,707 INFO L93 Difference]: Finished difference Result 264 states and 299 transitions. [2021-05-06 12:15:29,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 12:15:29,708 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 178 [2021-05-06 12:15:29,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:29,709 INFO L225 Difference]: With dead ends: 264 [2021-05-06 12:15:29,709 INFO L226 Difference]: Without dead ends: 218 [2021-05-06 12:15:29,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 11 SyntacticMatches, 95 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1795 ImplicationChecksByTransitivity, 8679.9ms TimeCoverageRelationStatistics Valid=1100, Invalid=10242, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 12:15:29,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-06 12:15:29,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 194. [2021-05-06 12:15:29,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 190 states have (on average 1.0789473684210527) internal successors, (205), 190 states have internal predecessors, (205), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:29,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 208 transitions. [2021-05-06 12:15:29,901 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 208 transitions. Word has length 178 [2021-05-06 12:15:29,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:29,901 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 208 transitions. [2021-05-06 12:15:29,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:29,901 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 208 transitions. [2021-05-06 12:15:29,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-06 12:15:29,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:29,902 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 49, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:29,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 12:15:29,902 INFO L428 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:29,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:29,902 INFO L82 PathProgramCache]: Analyzing trace with hash -170243399, now seen corresponding path program 47 times [2021-05-06 12:15:29,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:29,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718720244] [2021-05-06 12:15:29,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:29,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:29,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:15:29,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:29,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:29,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:30,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:30,072 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 12:15:34,838 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:34,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718720244] [2021-05-06 12:15:34,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [718720244] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:34,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:34,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 12:15:34,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996540133] [2021-05-06 12:15:34,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 12:15:34,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:34,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 12:15:34,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=2778, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 12:15:34,839 INFO L87 Difference]: Start difference. First operand 194 states and 208 transitions. Second operand has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:42,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:42,157 INFO L93 Difference]: Finished difference Result 267 states and 302 transitions. [2021-05-06 12:15:42,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 12:15:42,157 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 181 [2021-05-06 12:15:42,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:42,165 INFO L225 Difference]: With dead ends: 267 [2021-05-06 12:15:42,165 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 12:15:42,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 11 SyntacticMatches, 97 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1857 ImplicationChecksByTransitivity, 7742.2ms TimeCoverageRelationStatistics Valid=1122, Invalid=10650, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 12:15:42,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 12:15:42,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 197. [2021-05-06 12:15:42,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 193 states have (on average 1.077720207253886) internal successors, (208), 193 states have internal predecessors, (208), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:42,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 211 transitions. [2021-05-06 12:15:42,345 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 211 transitions. Word has length 181 [2021-05-06 12:15:42,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:42,345 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 211 transitions. [2021-05-06 12:15:42,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:42,346 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 211 transitions. [2021-05-06 12:15:42,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-05-06 12:15:42,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:42,347 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 50, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:42,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 12:15:42,347 INFO L428 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:42,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:42,347 INFO L82 PathProgramCache]: Analyzing trace with hash 135409080, now seen corresponding path program 48 times [2021-05-06 12:15:42,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:42,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100626723] [2021-05-06 12:15:42,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:42,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:42,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:15:42,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:42,425 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:42,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:42,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:42,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:42,578 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 12:15:48,444 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:48,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100626723] [2021-05-06 12:15:48,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2100626723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:48,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:48,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 12:15:48,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601745776] [2021-05-06 12:15:48,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 12:15:48,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:48,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 12:15:48,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=2884, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 12:15:48,446 INFO L87 Difference]: Start difference. First operand 197 states and 211 transitions. Second operand has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:56,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:56,332 INFO L93 Difference]: Finished difference Result 270 states and 305 transitions. [2021-05-06 12:15:56,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 12:15:56,333 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 184 [2021-05-06 12:15:56,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:56,334 INFO L225 Difference]: With dead ends: 270 [2021-05-06 12:15:56,334 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 12:15:56,334 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 11 SyntacticMatches, 99 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1920 ImplicationChecksByTransitivity, 8997.6ms TimeCoverageRelationStatistics Valid=1144, Invalid=11066, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 12:15:56,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 12:15:56,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 200. [2021-05-06 12:15:56,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 196 states have (on average 1.0765306122448979) internal successors, (211), 196 states have internal predecessors, (211), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:56,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 214 transitions. [2021-05-06 12:15:56,565 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 214 transitions. Word has length 184 [2021-05-06 12:15:56,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:56,566 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 214 transitions. [2021-05-06 12:15:56,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:15:56,566 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 214 transitions. [2021-05-06 12:15:56,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-06 12:15:56,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:56,579 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 51, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:56,579 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 12:15:56,579 INFO L428 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:56,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:56,580 INFO L82 PathProgramCache]: Analyzing trace with hash 497743449, now seen corresponding path program 49 times [2021-05-06 12:15:56,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:56,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021829695] [2021-05-06 12:15:56,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:56,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:56,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:15:56,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:56,656 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:56,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:56,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:56,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:56,788 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 12:16:02,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:02,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021829695] [2021-05-06 12:16:02,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1021829695] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:02,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:02,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 12:16:02,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108664132] [2021-05-06 12:16:02,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 12:16:02,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:02,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 12:16:02,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=2992, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 12:16:02,590 INFO L87 Difference]: Start difference. First operand 200 states and 214 transitions. Second operand has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:09,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:09,934 INFO L93 Difference]: Finished difference Result 273 states and 308 transitions. [2021-05-06 12:16:09,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 12:16:09,934 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 187 [2021-05-06 12:16:09,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:09,935 INFO L225 Difference]: With dead ends: 273 [2021-05-06 12:16:09,935 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 12:16:09,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 11 SyntacticMatches, 101 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1984 ImplicationChecksByTransitivity, 8834.7ms TimeCoverageRelationStatistics Valid=1166, Invalid=11490, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 12:16:09,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 12:16:10,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 203. [2021-05-06 12:16:10,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 199 states have (on average 1.0753768844221105) internal successors, (214), 199 states have internal predecessors, (214), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:10,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 217 transitions. [2021-05-06 12:16:10,178 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 217 transitions. Word has length 187 [2021-05-06 12:16:10,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:10,178 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 217 transitions. [2021-05-06 12:16:10,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:10,179 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 217 transitions. [2021-05-06 12:16:10,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-05-06 12:16:10,179 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:10,179 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 52, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:10,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 12:16:10,179 INFO L428 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:10,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:10,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1548115480, now seen corresponding path program 50 times [2021-05-06 12:16:10,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:10,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266456882] [2021-05-06 12:16:10,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:10,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:10,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:16:10,249 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:10,265 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:10,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:10,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:10,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:10,418 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 12:16:16,111 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:16,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266456882] [2021-05-06 12:16:16,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1266456882] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:16,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:16,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 12:16:16,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722593224] [2021-05-06 12:16:16,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 12:16:16,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:16,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 12:16:16,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=3102, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 12:16:16,112 INFO L87 Difference]: Start difference. First operand 203 states and 217 transitions. Second operand has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:23,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:23,308 INFO L93 Difference]: Finished difference Result 276 states and 311 transitions. [2021-05-06 12:16:23,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 12:16:23,309 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 190 [2021-05-06 12:16:23,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:23,309 INFO L225 Difference]: With dead ends: 276 [2021-05-06 12:16:23,309 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 12:16:23,310 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 11 SyntacticMatches, 103 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2049 ImplicationChecksByTransitivity, 8654.4ms TimeCoverageRelationStatistics Valid=1188, Invalid=11922, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 12:16:23,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 12:16:23,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 206. [2021-05-06 12:16:23,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 202 states have (on average 1.0742574257425743) internal successors, (217), 202 states have internal predecessors, (217), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:23,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2021-05-06 12:16:23,501 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 190 [2021-05-06 12:16:23,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:23,501 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2021-05-06 12:16:23,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:23,501 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2021-05-06 12:16:23,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 12:16:23,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:23,517 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 53, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:23,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 12:16:23,517 INFO L428 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:23,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:23,517 INFO L82 PathProgramCache]: Analyzing trace with hash 49572345, now seen corresponding path program 51 times [2021-05-06 12:16:23,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:23,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530969295] [2021-05-06 12:16:23,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:23,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:23,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:16:23,645 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:23,646 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:23,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:23,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:23,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:23,758 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 12:16:30,178 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:30,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530969295] [2021-05-06 12:16:30,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1530969295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:30,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:30,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 12:16:30,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368290017] [2021-05-06 12:16:30,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 12:16:30,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:30,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 12:16:30,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=3214, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 12:16:30,179 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:37,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:37,799 INFO L93 Difference]: Finished difference Result 279 states and 314 transitions. [2021-05-06 12:16:37,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 12:16:37,800 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 193 [2021-05-06 12:16:37,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:37,801 INFO L225 Difference]: With dead ends: 279 [2021-05-06 12:16:37,801 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 12:16:37,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 11 SyntacticMatches, 105 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2115 ImplicationChecksByTransitivity, 9502.1ms TimeCoverageRelationStatistics Valid=1210, Invalid=12362, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 12:16:37,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 12:16:38,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 209. [2021-05-06 12:16:38,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 205 states have (on average 1.0731707317073171) internal successors, (220), 205 states have internal predecessors, (220), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:38,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 223 transitions. [2021-05-06 12:16:38,093 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 223 transitions. Word has length 193 [2021-05-06 12:16:38,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:38,094 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 223 transitions. [2021-05-06 12:16:38,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:38,094 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 223 transitions. [2021-05-06 12:16:38,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-05-06 12:16:38,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:38,095 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 54, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:38,095 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 12:16:38,095 INFO L428 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:38,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:38,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1158887816, now seen corresponding path program 52 times [2021-05-06 12:16:38,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:38,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626719466] [2021-05-06 12:16:38,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:38,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:38,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:16:38,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:38,234 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:38,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:38,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:38,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:38,380 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 12:16:44,714 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:44,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626719466] [2021-05-06 12:16:44,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [626719466] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:44,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:44,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 12:16:44,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8460393] [2021-05-06 12:16:44,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 12:16:44,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:44,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 12:16:44,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=3328, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 12:16:44,715 INFO L87 Difference]: Start difference. First operand 209 states and 223 transitions. Second operand has 61 states, 61 states have (on average 3.0163934426229506) internal successors, (184), 60 states have internal predecessors, (184), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:52,424 INFO L93 Difference]: Finished difference Result 282 states and 317 transitions. [2021-05-06 12:16:52,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 12:16:52,424 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.0163934426229506) internal successors, (184), 60 states have internal predecessors, (184), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 196 [2021-05-06 12:16:52,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:52,425 INFO L225 Difference]: With dead ends: 282 [2021-05-06 12:16:52,425 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 12:16:52,426 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 11 SyntacticMatches, 107 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 9481.0ms TimeCoverageRelationStatistics Valid=1232, Invalid=12810, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 12:16:52,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 12:16:52,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 212. [2021-05-06 12:16:52,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 208 states have (on average 1.0721153846153846) internal successors, (223), 208 states have internal predecessors, (223), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:52,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 226 transitions. [2021-05-06 12:16:52,635 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 226 transitions. Word has length 196 [2021-05-06 12:16:52,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:52,635 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 226 transitions. [2021-05-06 12:16:52,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 3.0163934426229506) internal successors, (184), 60 states have internal predecessors, (184), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:16:52,635 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 226 transitions. [2021-05-06 12:16:52,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-05-06 12:16:52,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:52,636 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 55, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:52,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 12:16:52,636 INFO L428 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:52,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:52,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1979669095, now seen corresponding path program 53 times [2021-05-06 12:16:52,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:52,636 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867927071] [2021-05-06 12:16:52,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:52,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:52,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:16:52,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:52,706 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:52,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:52,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:52,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:52,842 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 12:16:59,155 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:59,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867927071] [2021-05-06 12:16:59,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1867927071] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:59,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:59,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 12:16:59,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292249082] [2021-05-06 12:16:59,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 12:16:59,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:59,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 12:16:59,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=3444, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 12:16:59,157 INFO L87 Difference]: Start difference. First operand 212 states and 226 transitions. Second operand has 62 states, 62 states have (on average 3.0161290322580645) internal successors, (187), 61 states have internal predecessors, (187), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:07,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:07,434 INFO L93 Difference]: Finished difference Result 285 states and 320 transitions. [2021-05-06 12:17:07,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 12:17:07,435 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.0161290322580645) internal successors, (187), 61 states have internal predecessors, (187), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 199 [2021-05-06 12:17:07,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:07,436 INFO L225 Difference]: With dead ends: 285 [2021-05-06 12:17:07,436 INFO L226 Difference]: Without dead ends: 239 [2021-05-06 12:17:07,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 11 SyntacticMatches, 109 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2250 ImplicationChecksByTransitivity, 9663.6ms TimeCoverageRelationStatistics Valid=1254, Invalid=13266, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 12:17:07,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-05-06 12:17:07,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 215. [2021-05-06 12:17:07,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 211 states have (on average 1.0710900473933649) internal successors, (226), 211 states have internal predecessors, (226), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:07,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 229 transitions. [2021-05-06 12:17:07,659 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 229 transitions. Word has length 199 [2021-05-06 12:17:07,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:07,660 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 229 transitions. [2021-05-06 12:17:07,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 3.0161290322580645) internal successors, (187), 61 states have internal predecessors, (187), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:07,660 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 229 transitions. [2021-05-06 12:17:07,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-05-06 12:17:07,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:07,660 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 56, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:07,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 12:17:07,661 INFO L428 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:07,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:07,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1669031640, now seen corresponding path program 54 times [2021-05-06 12:17:07,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:07,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648556944] [2021-05-06 12:17:07,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:07,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:07,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:17:07,737 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:07,737 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:17:07,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:07,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:07,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:07,903 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 12:17:14,823 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:14,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648556944] [2021-05-06 12:17:14,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [648556944] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:14,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:14,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 12:17:14,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272985502] [2021-05-06 12:17:14,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 12:17:14,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:14,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 12:17:14,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=3562, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 12:17:14,824 INFO L87 Difference]: Start difference. First operand 215 states and 229 transitions. Second operand has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:24,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:24,216 INFO L93 Difference]: Finished difference Result 288 states and 323 transitions. [2021-05-06 12:17:24,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 12:17:24,217 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 202 [2021-05-06 12:17:24,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:24,217 INFO L225 Difference]: With dead ends: 288 [2021-05-06 12:17:24,217 INFO L226 Difference]: Without dead ends: 242 [2021-05-06 12:17:24,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 11 SyntacticMatches, 111 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2319 ImplicationChecksByTransitivity, 10720.3ms TimeCoverageRelationStatistics Valid=1276, Invalid=13730, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 12:17:24,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-06 12:17:24,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 218. [2021-05-06 12:17:24,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 214 states have (on average 1.0700934579439252) internal successors, (229), 214 states have internal predecessors, (229), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:24,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 232 transitions. [2021-05-06 12:17:24,429 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 232 transitions. Word has length 202 [2021-05-06 12:17:24,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:24,429 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 232 transitions. [2021-05-06 12:17:24,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:24,430 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 232 transitions. [2021-05-06 12:17:24,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-05-06 12:17:24,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:24,430 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 57, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:24,430 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 12:17:24,430 INFO L428 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:24,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:24,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1214666439, now seen corresponding path program 55 times [2021-05-06 12:17:24,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:24,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377063938] [2021-05-06 12:17:24,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:24,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:24,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:17:24,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:24,534 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:17:24,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:24,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:24,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:24,631 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 12:17:32,055 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:32,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377063938] [2021-05-06 12:17:32,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1377063938] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:32,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:32,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 12:17:32,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135030135] [2021-05-06 12:17:32,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 12:17:32,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:32,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 12:17:32,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=3682, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 12:17:32,056 INFO L87 Difference]: Start difference. First operand 218 states and 232 transitions. Second operand has 64 states, 64 states have (on average 3.015625) internal successors, (193), 63 states have internal predecessors, (193), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:41,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:41,094 INFO L93 Difference]: Finished difference Result 291 states and 326 transitions. [2021-05-06 12:17:41,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 12:17:41,094 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.015625) internal successors, (193), 63 states have internal predecessors, (193), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 205 [2021-05-06 12:17:41,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:41,095 INFO L225 Difference]: With dead ends: 291 [2021-05-06 12:17:41,095 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 12:17:41,096 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 11 SyntacticMatches, 113 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2389 ImplicationChecksByTransitivity, 10898.0ms TimeCoverageRelationStatistics Valid=1298, Invalid=14202, Unknown=0, NotChecked=0, Total=15500 [2021-05-06 12:17:41,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 12:17:41,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 221. [2021-05-06 12:17:41,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 217 states have (on average 1.0691244239631337) internal successors, (232), 217 states have internal predecessors, (232), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:41,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 235 transitions. [2021-05-06 12:17:41,319 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 235 transitions. Word has length 205 [2021-05-06 12:17:41,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:41,319 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 235 transitions. [2021-05-06 12:17:41,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 3.015625) internal successors, (193), 63 states have internal predecessors, (193), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:41,319 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 235 transitions. [2021-05-06 12:17:41,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-05-06 12:17:41,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:41,320 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 58, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:41,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 12:17:41,320 INFO L428 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:41,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:41,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1528283336, now seen corresponding path program 56 times [2021-05-06 12:17:41,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:41,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953295622] [2021-05-06 12:17:41,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:41,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:41,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:17:41,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:41,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:17:41,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:41,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:41,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:41,525 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 12:17:48,243 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:17:48,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953295622] [2021-05-06 12:17:48,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [953295622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:17:48,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:17:48,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 12:17:48,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458022479] [2021-05-06 12:17:48,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 12:17:48,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:17:48,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 12:17:48,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=486, Invalid=3804, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 12:17:48,244 INFO L87 Difference]: Start difference. First operand 221 states and 235 transitions. Second operand has 65 states, 65 states have (on average 3.0153846153846153) internal successors, (196), 64 states have internal predecessors, (196), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:57,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:57,064 INFO L93 Difference]: Finished difference Result 294 states and 329 transitions. [2021-05-06 12:17:57,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 12:17:57,064 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.0153846153846153) internal successors, (196), 64 states have internal predecessors, (196), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 208 [2021-05-06 12:17:57,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:57,073 INFO L225 Difference]: With dead ends: 294 [2021-05-06 12:17:57,073 INFO L226 Difference]: Without dead ends: 248 [2021-05-06 12:17:57,074 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 11 SyntacticMatches, 115 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2460 ImplicationChecksByTransitivity, 10196.5ms TimeCoverageRelationStatistics Valid=1320, Invalid=14682, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 12:17:57,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-06 12:17:57,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 224. [2021-05-06 12:17:57,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 220 states have (on average 1.0681818181818181) internal successors, (235), 220 states have internal predecessors, (235), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:57,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 238 transitions. [2021-05-06 12:17:57,333 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 238 transitions. Word has length 208 [2021-05-06 12:17:57,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:57,334 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 238 transitions. [2021-05-06 12:17:57,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 3.0153846153846153) internal successors, (196), 64 states have internal predecessors, (196), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:17:57,334 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 238 transitions. [2021-05-06 12:17:57,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-05-06 12:17:57,335 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:57,335 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 59, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:57,335 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 12:17:57,335 INFO L428 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:57,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:57,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1359574233, now seen corresponding path program 57 times [2021-05-06 12:17:57,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:57,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705578452] [2021-05-06 12:17:57,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:57,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:57,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:17:57,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:57,434 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:17:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:57,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:57,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:57,536 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 12:18:04,243 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:04,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705578452] [2021-05-06 12:18:04,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1705578452] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:04,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:04,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 12:18:04,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592028140] [2021-05-06 12:18:04,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 12:18:04,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:04,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 12:18:04,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=3928, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 12:18:04,244 INFO L87 Difference]: Start difference. First operand 224 states and 238 transitions. Second operand has 66 states, 66 states have (on average 3.015151515151515) internal successors, (199), 65 states have internal predecessors, (199), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:13,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:18:13,496 INFO L93 Difference]: Finished difference Result 297 states and 332 transitions. [2021-05-06 12:18:13,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 12:18:13,497 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.015151515151515) internal successors, (199), 65 states have internal predecessors, (199), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 211 [2021-05-06 12:18:13,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:18:13,497 INFO L225 Difference]: With dead ends: 297 [2021-05-06 12:18:13,497 INFO L226 Difference]: Without dead ends: 251 [2021-05-06 12:18:13,498 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 11 SyntacticMatches, 117 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2532 ImplicationChecksByTransitivity, 10379.4ms TimeCoverageRelationStatistics Valid=1342, Invalid=15170, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 12:18:13,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-05-06 12:18:13,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 227. [2021-05-06 12:18:13,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 223 states have (on average 1.0672645739910314) internal successors, (238), 223 states have internal predecessors, (238), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:13,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 241 transitions. [2021-05-06 12:18:13,740 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 241 transitions. Word has length 211 [2021-05-06 12:18:13,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:18:13,740 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 241 transitions. [2021-05-06 12:18:13,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 3.015151515151515) internal successors, (199), 65 states have internal predecessors, (199), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:13,740 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 241 transitions. [2021-05-06 12:18:13,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-05-06 12:18:13,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:18:13,741 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 60, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:18:13,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 12:18:13,741 INFO L428 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:18:13,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:18:13,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1034506136, now seen corresponding path program 58 times [2021-05-06 12:18:13,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:18:13,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838919369] [2021-05-06 12:18:13,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:18:13,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:18:13,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:18:13,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:18:13,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:18:13,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:13,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:18:13,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:13,935 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 12:18:20,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:20,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838919369] [2021-05-06 12:18:20,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [838919369] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:20,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:20,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 12:18:20,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218263900] [2021-05-06 12:18:20,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 12:18:20,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:20,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 12:18:20,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=4054, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 12:18:20,997 INFO L87 Difference]: Start difference. First operand 227 states and 241 transitions. Second operand has 67 states, 67 states have (on average 3.014925373134328) internal successors, (202), 66 states have internal predecessors, (202), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:30,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:18:30,634 INFO L93 Difference]: Finished difference Result 300 states and 335 transitions. [2021-05-06 12:18:30,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 12:18:30,635 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.014925373134328) internal successors, (202), 66 states have internal predecessors, (202), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 214 [2021-05-06 12:18:30,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:18:30,636 INFO L225 Difference]: With dead ends: 300 [2021-05-06 12:18:30,636 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 12:18:30,636 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 11 SyntacticMatches, 119 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2605 ImplicationChecksByTransitivity, 10859.5ms TimeCoverageRelationStatistics Valid=1364, Invalid=15666, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 12:18:30,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 12:18:30,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 230. [2021-05-06 12:18:30,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 226 states have (on average 1.0663716814159292) internal successors, (241), 226 states have internal predecessors, (241), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:30,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 244 transitions. [2021-05-06 12:18:30,900 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 244 transitions. Word has length 214 [2021-05-06 12:18:30,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:18:30,900 INFO L480 AbstractCegarLoop]: Abstraction has 230 states and 244 transitions. [2021-05-06 12:18:30,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 3.014925373134328) internal successors, (202), 66 states have internal predecessors, (202), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:30,900 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 244 transitions. [2021-05-06 12:18:30,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-05-06 12:18:30,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:18:30,901 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 61, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:18:30,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 12:18:30,901 INFO L428 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:18:30,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:18:30,901 INFO L82 PathProgramCache]: Analyzing trace with hash 2082080889, now seen corresponding path program 59 times [2021-05-06 12:18:30,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:18:30,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202274367] [2021-05-06 12:18:30,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:18:30,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:18:30,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:18:30,982 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:18:30,983 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:18:30,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:31,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:18:31,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:31,086 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 12:18:38,938 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:38,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202274367] [2021-05-06 12:18:38,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1202274367] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:38,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:38,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 12:18:38,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377176269] [2021-05-06 12:18:38,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 12:18:38,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:38,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 12:18:38,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=510, Invalid=4182, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 12:18:38,939 INFO L87 Difference]: Start difference. First operand 230 states and 244 transitions. Second operand has 68 states, 68 states have (on average 3.014705882352941) internal successors, (205), 67 states have internal predecessors, (205), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:48,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:18:48,832 INFO L93 Difference]: Finished difference Result 303 states and 338 transitions. [2021-05-06 12:18:48,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 12:18:48,833 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.014705882352941) internal successors, (205), 67 states have internal predecessors, (205), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 217 [2021-05-06 12:18:48,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:18:48,834 INFO L225 Difference]: With dead ends: 303 [2021-05-06 12:18:48,834 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 12:18:48,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 11 SyntacticMatches, 121 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2679 ImplicationChecksByTransitivity, 11770.3ms TimeCoverageRelationStatistics Valid=1386, Invalid=16170, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 12:18:48,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 12:18:49,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 233. [2021-05-06 12:18:49,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 229 states have (on average 1.0655021834061136) internal successors, (244), 229 states have internal predecessors, (244), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:49,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 247 transitions. [2021-05-06 12:18:49,086 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 247 transitions. Word has length 217 [2021-05-06 12:18:49,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:18:49,086 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 247 transitions. [2021-05-06 12:18:49,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 3.014705882352941) internal successors, (205), 67 states have internal predecessors, (205), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:18:49,086 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 247 transitions. [2021-05-06 12:18:49,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-05-06 12:18:49,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:18:49,087 INFO L523 BasicCegarLoop]: trace histogram [63, 62, 62, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:18:49,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 12:18:49,087 INFO L428 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:18:49,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:18:49,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1145792520, now seen corresponding path program 60 times [2021-05-06 12:18:49,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:18:49,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18641055] [2021-05-06 12:18:49,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:18:49,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:18:49,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:18:49,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:18:49,176 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:18:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:49,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:18:49,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:49,277 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 12:18:57,080 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:57,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18641055] [2021-05-06 12:18:57,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [18641055] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:57,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:57,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 12:18:57,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736072544] [2021-05-06 12:18:57,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 12:18:57,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:57,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 12:18:57,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=4312, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 12:18:57,081 INFO L87 Difference]: Start difference. First operand 233 states and 247 transitions. Second operand has 69 states, 69 states have (on average 3.0144927536231885) internal successors, (208), 68 states have internal predecessors, (208), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:07,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:19:07,474 INFO L93 Difference]: Finished difference Result 306 states and 341 transitions. [2021-05-06 12:19:07,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 12:19:07,475 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.0144927536231885) internal successors, (208), 68 states have internal predecessors, (208), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 220 [2021-05-06 12:19:07,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:19:07,476 INFO L225 Difference]: With dead ends: 306 [2021-05-06 12:19:07,476 INFO L226 Difference]: Without dead ends: 260 [2021-05-06 12:19:07,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 11 SyntacticMatches, 123 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2754 ImplicationChecksByTransitivity, 11902.3ms TimeCoverageRelationStatistics Valid=1408, Invalid=16682, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 12:19:07,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-06 12:19:07,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 236. [2021-05-06 12:19:07,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 232 states have (on average 1.0646551724137931) internal successors, (247), 232 states have internal predecessors, (247), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:07,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 250 transitions. [2021-05-06 12:19:07,755 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 250 transitions. Word has length 220 [2021-05-06 12:19:07,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:19:07,755 INFO L480 AbstractCegarLoop]: Abstraction has 236 states and 250 transitions. [2021-05-06 12:19:07,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 3.0144927536231885) internal successors, (208), 68 states have internal predecessors, (208), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:07,756 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 250 transitions. [2021-05-06 12:19:07,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2021-05-06 12:19:07,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:19:07,756 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 63, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:19:07,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 12:19:07,756 INFO L428 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:19:07,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:19:07,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1595237401, now seen corresponding path program 61 times [2021-05-06 12:19:07,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:19:07,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240024319] [2021-05-06 12:19:07,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:19:07,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:19:07,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:19:07,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:19:07,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:19:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:08,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:19:08,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:08,025 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 12:19:16,011 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:19:16,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240024319] [2021-05-06 12:19:16,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1240024319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:19:16,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:19:16,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 12:19:16,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531904668] [2021-05-06 12:19:16,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 12:19:16,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:19:16,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 12:19:16,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=4444, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 12:19:16,013 INFO L87 Difference]: Start difference. First operand 236 states and 250 transitions. Second operand has 70 states, 70 states have (on average 3.0142857142857142) internal successors, (211), 69 states have internal predecessors, (211), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:26,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:19:26,018 INFO L93 Difference]: Finished difference Result 309 states and 344 transitions. [2021-05-06 12:19:26,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 12:19:26,018 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.0142857142857142) internal successors, (211), 69 states have internal predecessors, (211), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 223 [2021-05-06 12:19:26,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:19:26,019 INFO L225 Difference]: With dead ends: 309 [2021-05-06 12:19:26,019 INFO L226 Difference]: Without dead ends: 263 [2021-05-06 12:19:26,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 11 SyntacticMatches, 125 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2830 ImplicationChecksByTransitivity, 11962.8ms TimeCoverageRelationStatistics Valid=1430, Invalid=17202, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 12:19:26,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-05-06 12:19:26,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 239. [2021-05-06 12:19:26,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:26,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 253 transitions. [2021-05-06 12:19:26,300 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 253 transitions. Word has length 223 [2021-05-06 12:19:26,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:19:26,300 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 253 transitions. [2021-05-06 12:19:26,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 3.0142857142857142) internal successors, (211), 69 states have internal predecessors, (211), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:26,300 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 253 transitions. [2021-05-06 12:19:26,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-05-06 12:19:26,301 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:19:26,301 INFO L523 BasicCegarLoop]: trace histogram [65, 64, 64, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:19:26,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 12:19:26,301 INFO L428 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:19:26,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:19:26,302 INFO L82 PathProgramCache]: Analyzing trace with hash -595584936, now seen corresponding path program 62 times [2021-05-06 12:19:26,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:19:26,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949428517] [2021-05-06 12:19:26,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:19:26,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:19:26,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:19:26,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:19:26,401 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:19:26,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:26,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:19:26,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:26,526 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 12:19:34,738 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:19:34,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949428517] [2021-05-06 12:19:34,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1949428517] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:19:34,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:19:34,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 12:19:34,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380336628] [2021-05-06 12:19:34,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 12:19:34,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:19:34,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 12:19:34,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=4578, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 12:19:34,740 INFO L87 Difference]: Start difference. First operand 239 states and 253 transitions. Second operand has 71 states, 71 states have (on average 3.0140845070422535) internal successors, (214), 70 states have internal predecessors, (214), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:45,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:19:45,658 INFO L93 Difference]: Finished difference Result 312 states and 347 transitions. [2021-05-06 12:19:45,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 12:19:45,659 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.0140845070422535) internal successors, (214), 70 states have internal predecessors, (214), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 226 [2021-05-06 12:19:45,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:19:45,660 INFO L225 Difference]: With dead ends: 312 [2021-05-06 12:19:45,660 INFO L226 Difference]: Without dead ends: 266 [2021-05-06 12:19:45,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 11 SyntacticMatches, 127 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2907 ImplicationChecksByTransitivity, 12339.1ms TimeCoverageRelationStatistics Valid=1452, Invalid=17730, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 12:19:45,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-06 12:19:45,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 242. [2021-05-06 12:19:45,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 238 states have (on average 1.0630252100840336) internal successors, (253), 238 states have internal predecessors, (253), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:45,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 256 transitions. [2021-05-06 12:19:45,944 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 256 transitions. Word has length 226 [2021-05-06 12:19:45,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:19:45,944 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 256 transitions. [2021-05-06 12:19:45,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 3.0140845070422535) internal successors, (214), 70 states have internal predecessors, (214), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:19:45,944 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 256 transitions. [2021-05-06 12:19:45,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-05-06 12:19:45,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:19:45,945 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 65, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:19:45,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 12:19:45,945 INFO L428 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:19:45,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:19:45,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1060796487, now seen corresponding path program 63 times [2021-05-06 12:19:45,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:19:45,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004147194] [2021-05-06 12:19:45,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:19:45,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:19:46,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:19:46,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:19:46,028 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:19:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:46,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:19:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:19:46,157 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 12:19:54,534 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:19:54,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004147194] [2021-05-06 12:19:54,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2004147194] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:19:54,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:19:54,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 12:19:54,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063062041] [2021-05-06 12:19:54,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 12:19:54,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:19:54,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 12:19:54,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=4714, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 12:19:54,536 INFO L87 Difference]: Start difference. First operand 242 states and 256 transitions. Second operand has 72 states, 72 states have (on average 3.013888888888889) internal successors, (217), 71 states have internal predecessors, (217), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:06,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:20:06,805 INFO L93 Difference]: Finished difference Result 315 states and 350 transitions. [2021-05-06 12:20:06,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 12:20:06,806 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.013888888888889) internal successors, (217), 71 states have internal predecessors, (217), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 229 [2021-05-06 12:20:06,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:20:06,807 INFO L225 Difference]: With dead ends: 315 [2021-05-06 12:20:06,807 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 12:20:06,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 11 SyntacticMatches, 129 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2985 ImplicationChecksByTransitivity, 12994.1ms TimeCoverageRelationStatistics Valid=1474, Invalid=18266, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 12:20:06,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 12:20:07,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 245. [2021-05-06 12:20:07,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 241 states have (on average 1.062240663900415) internal successors, (256), 241 states have internal predecessors, (256), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:07,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 259 transitions. [2021-05-06 12:20:07,246 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 259 transitions. Word has length 229 [2021-05-06 12:20:07,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:20:07,246 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 259 transitions. [2021-05-06 12:20:07,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 3.013888888888889) internal successors, (217), 71 states have internal predecessors, (217), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:07,246 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 259 transitions. [2021-05-06 12:20:07,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2021-05-06 12:20:07,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:20:07,247 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 66, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:20:07,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 12:20:07,247 INFO L428 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:20:07,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:20:07,248 INFO L82 PathProgramCache]: Analyzing trace with hash -318648136, now seen corresponding path program 64 times [2021-05-06 12:20:07,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:20:07,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686733300] [2021-05-06 12:20:07,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:20:07,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:20:07,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:20:07,367 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:20:07,368 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:20:07,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:07,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:20:07,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:07,525 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 12:20:17,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:20:17,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686733300] [2021-05-06 12:20:17,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1686733300] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:20:17,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:20:17,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 12:20:17,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286788171] [2021-05-06 12:20:17,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 12:20:17,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:20:17,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 12:20:17,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=4852, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 12:20:17,451 INFO L87 Difference]: Start difference. First operand 245 states and 259 transitions. Second operand has 73 states, 73 states have (on average 3.0136986301369864) internal successors, (220), 72 states have internal predecessors, (220), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:29,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:20:29,797 INFO L93 Difference]: Finished difference Result 318 states and 353 transitions. [2021-05-06 12:20:29,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 12:20:29,798 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.0136986301369864) internal successors, (220), 72 states have internal predecessors, (220), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 232 [2021-05-06 12:20:29,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:20:29,798 INFO L225 Difference]: With dead ends: 318 [2021-05-06 12:20:29,798 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 12:20:29,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 11 SyntacticMatches, 131 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3064 ImplicationChecksByTransitivity, 14722.2ms TimeCoverageRelationStatistics Valid=1496, Invalid=18810, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 12:20:29,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 12:20:30,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 248. [2021-05-06 12:20:30,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 244 states have (on average 1.0614754098360655) internal successors, (259), 244 states have internal predecessors, (259), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:30,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 262 transitions. [2021-05-06 12:20:30,099 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 262 transitions. Word has length 232 [2021-05-06 12:20:30,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:20:30,099 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 262 transitions. [2021-05-06 12:20:30,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 3.0136986301369864) internal successors, (220), 72 states have internal predecessors, (220), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:30,113 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 262 transitions. [2021-05-06 12:20:30,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2021-05-06 12:20:30,113 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:20:30,113 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 67, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:20:30,114 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 12:20:30,114 INFO L428 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:20:30,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:20:30,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1468763303, now seen corresponding path program 65 times [2021-05-06 12:20:30,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:20:30,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056402886] [2021-05-06 12:20:30,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:20:30,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:20:30,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:20:30,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:20:30,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:20:30,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:30,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:20:30,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:30,431 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 12:20:40,202 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:20:40,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2056402886] [2021-05-06 12:20:40,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2056402886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:20:40,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:20:40,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 12:20:40,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015325418] [2021-05-06 12:20:40,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 12:20:40,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:20:40,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 12:20:40,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=4992, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 12:20:40,203 INFO L87 Difference]: Start difference. First operand 248 states and 262 transitions. Second operand has 74 states, 74 states have (on average 3.0135135135135136) internal successors, (223), 73 states have internal predecessors, (223), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:53,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:20:53,383 INFO L93 Difference]: Finished difference Result 321 states and 356 transitions. [2021-05-06 12:20:53,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 12:20:53,384 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.0135135135135136) internal successors, (223), 73 states have internal predecessors, (223), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 235 [2021-05-06 12:20:53,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:20:53,385 INFO L225 Difference]: With dead ends: 321 [2021-05-06 12:20:53,385 INFO L226 Difference]: Without dead ends: 275 [2021-05-06 12:20:53,385 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 11 SyntacticMatches, 133 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3144 ImplicationChecksByTransitivity, 14710.3ms TimeCoverageRelationStatistics Valid=1518, Invalid=19362, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 12:20:53,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-05-06 12:20:53,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 251. [2021-05-06 12:20:53,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 247 states have (on average 1.0607287449392713) internal successors, (262), 247 states have internal predecessors, (262), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:53,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 265 transitions. [2021-05-06 12:20:53,703 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 265 transitions. Word has length 235 [2021-05-06 12:20:53,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:20:53,703 INFO L480 AbstractCegarLoop]: Abstraction has 251 states and 265 transitions. [2021-05-06 12:20:53,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 3.0135135135135136) internal successors, (223), 73 states have internal predecessors, (223), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:20:53,704 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 265 transitions. [2021-05-06 12:20:53,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-05-06 12:20:53,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:20:53,705 INFO L523 BasicCegarLoop]: trace histogram [69, 68, 68, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:20:53,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 12:20:53,705 INFO L428 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:20:53,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:20:53,705 INFO L82 PathProgramCache]: Analyzing trace with hash 699384088, now seen corresponding path program 66 times [2021-05-06 12:20:53,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:20:53,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542157675] [2021-05-06 12:20:53,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:20:53,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:20:53,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:20:53,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:20:53,812 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:20:53,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:53,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:20:53,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:20:53,935 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 12:21:03,583 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:21:03,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542157675] [2021-05-06 12:21:03,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1542157675] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:21:03,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:21:03,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 12:21:03,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136264073] [2021-05-06 12:21:03,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 12:21:03,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:21:03,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 12:21:03,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=5134, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 12:21:03,584 INFO L87 Difference]: Start difference. First operand 251 states and 265 transitions. Second operand has 75 states, 75 states have (on average 3.013333333333333) internal successors, (226), 74 states have internal predecessors, (226), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:16,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:21:16,064 INFO L93 Difference]: Finished difference Result 324 states and 359 transitions. [2021-05-06 12:21:16,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 12:21:16,064 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.013333333333333) internal successors, (226), 74 states have internal predecessors, (226), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 238 [2021-05-06 12:21:16,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:21:16,065 INFO L225 Difference]: With dead ends: 324 [2021-05-06 12:21:16,065 INFO L226 Difference]: Without dead ends: 278 [2021-05-06 12:21:16,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 11 SyntacticMatches, 135 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3225 ImplicationChecksByTransitivity, 14400.4ms TimeCoverageRelationStatistics Valid=1540, Invalid=19922, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 12:21:16,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-05-06 12:21:16,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 254. [2021-05-06 12:21:16,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 250 states have (on average 1.06) internal successors, (265), 250 states have internal predecessors, (265), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:16,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 268 transitions. [2021-05-06 12:21:16,408 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 268 transitions. Word has length 238 [2021-05-06 12:21:16,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:21:16,409 INFO L480 AbstractCegarLoop]: Abstraction has 254 states and 268 transitions. [2021-05-06 12:21:16,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 3.013333333333333) internal successors, (226), 74 states have internal predecessors, (226), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:16,409 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 268 transitions. [2021-05-06 12:21:16,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-05-06 12:21:16,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:16,410 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 69, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:16,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 12:21:16,410 INFO L428 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:16,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:16,410 INFO L82 PathProgramCache]: Analyzing trace with hash -34855175, now seen corresponding path program 67 times [2021-05-06 12:21:16,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:16,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515025678] [2021-05-06 12:21:16,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:16,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:21:16,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:21:16,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:21:16,502 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:21:16,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:16,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:16,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:16,613 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 12:21:25,299 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:21:25,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515025678] [2021-05-06 12:21:25,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [515025678] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:21:25,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:21:25,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 12:21:25,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194888115] [2021-05-06 12:21:25,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 12:21:25,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:21:25,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 12:21:25,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=5278, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 12:21:25,301 INFO L87 Difference]: Start difference. First operand 254 states and 268 transitions. Second operand has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:36,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:21:36,464 INFO L93 Difference]: Finished difference Result 327 states and 362 transitions. [2021-05-06 12:21:36,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 12:21:36,464 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 241 [2021-05-06 12:21:36,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:21:36,465 INFO L225 Difference]: With dead ends: 327 [2021-05-06 12:21:36,465 INFO L226 Difference]: Without dead ends: 281 [2021-05-06 12:21:36,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 11 SyntacticMatches, 137 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3307 ImplicationChecksByTransitivity, 12877.5ms TimeCoverageRelationStatistics Valid=1562, Invalid=20490, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 12:21:36,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-05-06 12:21:36,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 257. [2021-05-06 12:21:36,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 253 states have (on average 1.0592885375494072) internal successors, (268), 253 states have internal predecessors, (268), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:36,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 271 transitions. [2021-05-06 12:21:36,810 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 271 transitions. Word has length 241 [2021-05-06 12:21:36,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:21:36,810 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 271 transitions. [2021-05-06 12:21:36,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:36,810 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 271 transitions. [2021-05-06 12:21:36,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2021-05-06 12:21:36,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:36,811 INFO L523 BasicCegarLoop]: trace histogram [71, 70, 70, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:36,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 12:21:36,811 INFO L428 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:36,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:36,812 INFO L82 PathProgramCache]: Analyzing trace with hash 511699320, now seen corresponding path program 68 times [2021-05-06 12:21:36,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:36,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125102034] [2021-05-06 12:21:36,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:36,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:21:36,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:21:36,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:21:36,931 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:21:36,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:37,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:37,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:37,039 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 12:21:46,524 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:21:46,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125102034] [2021-05-06 12:21:46,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [125102034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:21:46,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:21:46,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 12:21:46,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584301361] [2021-05-06 12:21:46,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 12:21:46,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:21:46,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 12:21:46,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=5424, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 12:21:46,526 INFO L87 Difference]: Start difference. First operand 257 states and 271 transitions. Second operand has 77 states, 77 states have (on average 3.012987012987013) internal successors, (232), 76 states have internal predecessors, (232), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:58,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:21:58,842 INFO L93 Difference]: Finished difference Result 330 states and 365 transitions. [2021-05-06 12:21:58,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 12:21:58,843 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.012987012987013) internal successors, (232), 76 states have internal predecessors, (232), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 244 [2021-05-06 12:21:58,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:21:58,843 INFO L225 Difference]: With dead ends: 330 [2021-05-06 12:21:58,843 INFO L226 Difference]: Without dead ends: 284 [2021-05-06 12:21:58,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 11 SyntacticMatches, 139 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3390 ImplicationChecksByTransitivity, 14172.4ms TimeCoverageRelationStatistics Valid=1584, Invalid=21066, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 12:21:58,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-06 12:21:59,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 260. [2021-05-06 12:21:59,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 256 states have (on average 1.05859375) internal successors, (271), 256 states have internal predecessors, (271), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:59,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 274 transitions. [2021-05-06 12:21:59,187 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 274 transitions. Word has length 244 [2021-05-06 12:21:59,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:21:59,189 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 274 transitions. [2021-05-06 12:21:59,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 77 states have (on average 3.012987012987013) internal successors, (232), 76 states have internal predecessors, (232), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:21:59,189 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 274 transitions. [2021-05-06 12:21:59,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2021-05-06 12:21:59,197 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:59,197 INFO L523 BasicCegarLoop]: trace histogram [72, 71, 71, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:59,197 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 12:21:59,197 INFO L428 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:59,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:59,198 INFO L82 PathProgramCache]: Analyzing trace with hash 695640729, now seen corresponding path program 69 times [2021-05-06 12:21:59,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:59,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043251886] [2021-05-06 12:21:59,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:59,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:21:59,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:21:59,291 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:21:59,292 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:21:59,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:59,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:59,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:59,404 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 12:22:09,540 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:22:09,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043251886] [2021-05-06 12:22:09,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2043251886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:22:09,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:22:09,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 12:22:09,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600906983] [2021-05-06 12:22:09,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 12:22:09,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:22:09,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 12:22:09,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=5572, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 12:22:09,542 INFO L87 Difference]: Start difference. First operand 260 states and 274 transitions. Second operand has 78 states, 78 states have (on average 3.0128205128205128) internal successors, (235), 77 states have internal predecessors, (235), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:21,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:22:21,453 INFO L93 Difference]: Finished difference Result 333 states and 368 transitions. [2021-05-06 12:22:21,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 12:22:21,453 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.0128205128205128) internal successors, (235), 77 states have internal predecessors, (235), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 247 [2021-05-06 12:22:21,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:22:21,454 INFO L225 Difference]: With dead ends: 333 [2021-05-06 12:22:21,454 INFO L226 Difference]: Without dead ends: 287 [2021-05-06 12:22:21,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 11 SyntacticMatches, 141 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3474 ImplicationChecksByTransitivity, 14592.3ms TimeCoverageRelationStatistics Valid=1606, Invalid=21650, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 12:22:21,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-05-06 12:22:21,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 263. [2021-05-06 12:22:21,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 259 states have (on average 1.057915057915058) internal successors, (274), 259 states have internal predecessors, (274), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:21,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 277 transitions. [2021-05-06 12:22:21,816 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 277 transitions. Word has length 247 [2021-05-06 12:22:21,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:22:21,817 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 277 transitions. [2021-05-06 12:22:21,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 3.0128205128205128) internal successors, (235), 77 states have internal predecessors, (235), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:21,817 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 277 transitions. [2021-05-06 12:22:21,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-05-06 12:22:21,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:22:21,818 INFO L523 BasicCegarLoop]: trace histogram [73, 72, 72, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:22:21,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 12:22:21,818 INFO L428 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:22:21,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:22:21,818 INFO L82 PathProgramCache]: Analyzing trace with hash 115886552, now seen corresponding path program 70 times [2021-05-06 12:22:21,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:22:21,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32477363] [2021-05-06 12:22:21,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:22:21,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:22:21,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:22:21,907 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:22:21,908 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:22:21,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:22:22,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:22:22,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:22:22,075 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 12:22:33,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:22:33,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32477363] [2021-05-06 12:22:33,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [32477363] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:22:33,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:22:33,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 12:22:33,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948308796] [2021-05-06 12:22:33,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 12:22:33,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:22:33,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 12:22:33,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=598, Invalid=5722, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 12:22:33,582 INFO L87 Difference]: Start difference. First operand 263 states and 277 transitions. Second operand has 79 states, 79 states have (on average 3.0126582278481013) internal successors, (238), 78 states have internal predecessors, (238), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:46,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:22:46,983 INFO L93 Difference]: Finished difference Result 336 states and 371 transitions. [2021-05-06 12:22:46,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 12:22:46,983 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.0126582278481013) internal successors, (238), 78 states have internal predecessors, (238), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 250 [2021-05-06 12:22:46,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:22:46,984 INFO L225 Difference]: With dead ends: 336 [2021-05-06 12:22:46,984 INFO L226 Difference]: Without dead ends: 290 [2021-05-06 12:22:46,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 11 SyntacticMatches, 143 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3559 ImplicationChecksByTransitivity, 16631.0ms TimeCoverageRelationStatistics Valid=1628, Invalid=22242, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 12:22:46,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-05-06 12:22:47,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 266. [2021-05-06 12:22:47,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 262 states have (on average 1.0572519083969465) internal successors, (277), 262 states have internal predecessors, (277), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:47,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 280 transitions. [2021-05-06 12:22:47,334 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 280 transitions. Word has length 250 [2021-05-06 12:22:47,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:22:47,334 INFO L480 AbstractCegarLoop]: Abstraction has 266 states and 280 transitions. [2021-05-06 12:22:47,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 3.0126582278481013) internal successors, (238), 78 states have internal predecessors, (238), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:22:47,334 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 280 transitions. [2021-05-06 12:22:47,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-05-06 12:22:47,335 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:22:47,335 INFO L523 BasicCegarLoop]: trace histogram [74, 73, 73, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:22:47,335 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 12:22:47,335 INFO L428 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:22:47,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:22:47,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1277303239, now seen corresponding path program 71 times [2021-05-06 12:22:47,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:22:47,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176311599] [2021-05-06 12:22:47,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:22:47,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:22:47,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:22:47,439 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:22:47,440 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:22:47,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:22:47,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:22:47,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:22:47,546 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 12:22:58,989 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:22:58,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176311599] [2021-05-06 12:22:58,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1176311599] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:22:58,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:22:58,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 12:22:58,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468563175] [2021-05-06 12:22:58,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 12:22:58,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:22:58,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 12:22:58,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=606, Invalid=5874, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 12:22:58,991 INFO L87 Difference]: Start difference. First operand 266 states and 280 transitions. Second operand has 80 states, 80 states have (on average 3.0125) internal successors, (241), 79 states have internal predecessors, (241), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:12,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:12,671 INFO L93 Difference]: Finished difference Result 339 states and 374 transitions. [2021-05-06 12:23:12,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 12:23:12,671 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.0125) internal successors, (241), 79 states have internal predecessors, (241), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 253 [2021-05-06 12:23:12,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:12,672 INFO L225 Difference]: With dead ends: 339 [2021-05-06 12:23:12,672 INFO L226 Difference]: Without dead ends: 293 [2021-05-06 12:23:12,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 11 SyntacticMatches, 145 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3645 ImplicationChecksByTransitivity, 16552.4ms TimeCoverageRelationStatistics Valid=1650, Invalid=22842, Unknown=0, NotChecked=0, Total=24492 [2021-05-06 12:23:12,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-06 12:23:13,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 269. [2021-05-06 12:23:13,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 265 states have (on average 1.0566037735849056) internal successors, (280), 265 states have internal predecessors, (280), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:13,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 283 transitions. [2021-05-06 12:23:13,024 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 283 transitions. Word has length 253 [2021-05-06 12:23:13,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:13,024 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 283 transitions. [2021-05-06 12:23:13,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 3.0125) internal successors, (241), 79 states have internal predecessors, (241), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:13,025 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 283 transitions. [2021-05-06 12:23:13,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-05-06 12:23:13,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:13,025 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 74, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:13,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 12:23:13,026 INFO L428 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:13,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:13,026 INFO L82 PathProgramCache]: Analyzing trace with hash 769581624, now seen corresponding path program 72 times [2021-05-06 12:23:13,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:13,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756657289] [2021-05-06 12:23:13,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:13,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:23:13,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:23:13,115 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:23:13,116 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:23:13,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:13,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:13,214 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 12:23:24,424 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:23:24,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756657289] [2021-05-06 12:23:24,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1756657289] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:23:24,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:23:24,424 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 12:23:24,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474359731] [2021-05-06 12:23:24,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 12:23:24,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:23:24,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 12:23:24,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=6028, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 12:23:24,427 INFO L87 Difference]: Start difference. First operand 269 states and 283 transitions. Second operand has 81 states, 81 states have (on average 3.0123456790123457) internal successors, (244), 80 states have internal predecessors, (244), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:38,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:38,750 INFO L93 Difference]: Finished difference Result 342 states and 377 transitions. [2021-05-06 12:23:38,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 12:23:38,750 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.0123456790123457) internal successors, (244), 80 states have internal predecessors, (244), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 256 [2021-05-06 12:23:38,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:38,751 INFO L225 Difference]: With dead ends: 342 [2021-05-06 12:23:38,751 INFO L226 Difference]: Without dead ends: 296 [2021-05-06 12:23:38,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 11 SyntacticMatches, 147 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3732 ImplicationChecksByTransitivity, 16502.7ms TimeCoverageRelationStatistics Valid=1672, Invalid=23450, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 12:23:38,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-06 12:23:39,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 272. [2021-05-06 12:23:39,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 268 states have (on average 1.0559701492537314) internal successors, (283), 268 states have internal predecessors, (283), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:39,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 286 transitions. [2021-05-06 12:23:39,146 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 286 transitions. Word has length 256 [2021-05-06 12:23:39,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:39,146 INFO L480 AbstractCegarLoop]: Abstraction has 272 states and 286 transitions. [2021-05-06 12:23:39,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 3.0123456790123457) internal successors, (244), 80 states have internal predecessors, (244), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:23:39,146 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 286 transitions. [2021-05-06 12:23:39,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2021-05-06 12:23:39,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:39,147 INFO L523 BasicCegarLoop]: trace histogram [76, 75, 75, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:39,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 12:23:39,147 INFO L428 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:39,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:39,147 INFO L82 PathProgramCache]: Analyzing trace with hash -429133351, now seen corresponding path program 73 times [2021-05-06 12:23:39,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:39,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561048154] [2021-05-06 12:23:39,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:39,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:23:39,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:23:39,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:23:39,234 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:23:39,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:39,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:39,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:39,330 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 12:23:50,069 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:23:50,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561048154] [2021-05-06 12:23:50,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [561048154] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:23:50,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:23:50,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 12:23:50,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444152535] [2021-05-06 12:23:50,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 12:23:50,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:23:50,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 12:23:50,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=6184, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 12:23:50,070 INFO L87 Difference]: Start difference. First operand 272 states and 286 transitions. Second operand has 82 states, 82 states have (on average 3.0121951219512195) internal successors, (247), 81 states have internal predecessors, (247), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:04,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:24:04,135 INFO L93 Difference]: Finished difference Result 345 states and 380 transitions. [2021-05-06 12:24:04,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 12:24:04,136 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.0121951219512195) internal successors, (247), 81 states have internal predecessors, (247), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 259 [2021-05-06 12:24:04,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:24:04,136 INFO L225 Difference]: With dead ends: 345 [2021-05-06 12:24:04,137 INFO L226 Difference]: Without dead ends: 299 [2021-05-06 12:24:04,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 11 SyntacticMatches, 149 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3820 ImplicationChecksByTransitivity, 16082.0ms TimeCoverageRelationStatistics Valid=1694, Invalid=24066, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 12:24:04,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-06 12:24:04,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 275. [2021-05-06 12:24:04,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 271 states have (on average 1.055350553505535) internal successors, (286), 271 states have internal predecessors, (286), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:04,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 289 transitions. [2021-05-06 12:24:04,533 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 289 transitions. Word has length 259 [2021-05-06 12:24:04,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:24:04,533 INFO L480 AbstractCegarLoop]: Abstraction has 275 states and 289 transitions. [2021-05-06 12:24:04,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 3.0121951219512195) internal successors, (247), 81 states have internal predecessors, (247), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:04,533 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 289 transitions. [2021-05-06 12:24:04,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-05-06 12:24:04,534 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:24:04,534 INFO L523 BasicCegarLoop]: trace histogram [77, 76, 76, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:24:04,534 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 12:24:04,534 INFO L428 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:24:04,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:24:04,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1306112664, now seen corresponding path program 74 times [2021-05-06 12:24:04,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:24:04,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265004423] [2021-05-06 12:24:04,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:24:04,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:24:04,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:24:04,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:24:04,691 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:24:04,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:04,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:24:04,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:04,870 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 12:24:16,303 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:24:16,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265004423] [2021-05-06 12:24:16,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [265004423] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:24:16,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:24:16,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 12:24:16,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796159282] [2021-05-06 12:24:16,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 12:24:16,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:24:16,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 12:24:16,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=6342, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 12:24:16,304 INFO L87 Difference]: Start difference. First operand 275 states and 289 transitions. Second operand has 83 states, 83 states have (on average 3.0120481927710845) internal successors, (250), 82 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:30,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:24:30,630 INFO L93 Difference]: Finished difference Result 348 states and 383 transitions. [2021-05-06 12:24:30,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 12:24:30,631 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.0120481927710845) internal successors, (250), 82 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 262 [2021-05-06 12:24:30,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:24:30,632 INFO L225 Difference]: With dead ends: 348 [2021-05-06 12:24:30,632 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 12:24:30,633 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 11 SyntacticMatches, 151 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3909 ImplicationChecksByTransitivity, 16741.8ms TimeCoverageRelationStatistics Valid=1716, Invalid=24690, Unknown=0, NotChecked=0, Total=26406 [2021-05-06 12:24:30,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 12:24:31,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 278. [2021-05-06 12:24:31,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 274 states have (on average 1.0547445255474452) internal successors, (289), 274 states have internal predecessors, (289), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:31,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 292 transitions. [2021-05-06 12:24:31,010 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 292 transitions. Word has length 262 [2021-05-06 12:24:31,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:24:31,010 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 292 transitions. [2021-05-06 12:24:31,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 83 states have (on average 3.0120481927710845) internal successors, (250), 82 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:31,010 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 292 transitions. [2021-05-06 12:24:31,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-05-06 12:24:31,011 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:24:31,011 INFO L523 BasicCegarLoop]: trace histogram [78, 77, 77, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:24:31,011 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 12:24:31,011 INFO L428 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:24:31,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:24:31,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1793770873, now seen corresponding path program 75 times [2021-05-06 12:24:31,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:24:31,011 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1550020164] [2021-05-06 12:24:31,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:24:31,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:24:31,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:24:31,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:24:31,107 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:24:31,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:31,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:24:31,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:31,214 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 12:24:42,223 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:24:42,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1550020164] [2021-05-06 12:24:42,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1550020164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:24:42,223 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:24:42,223 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 12:24:42,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969740139] [2021-05-06 12:24:42,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 12:24:42,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:24:42,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 12:24:42,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=6502, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 12:24:42,224 INFO L87 Difference]: Start difference. First operand 278 states and 292 transitions. Second operand has 84 states, 84 states have (on average 3.011904761904762) internal successors, (253), 83 states have internal predecessors, (253), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:56,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:24:56,457 INFO L93 Difference]: Finished difference Result 351 states and 386 transitions. [2021-05-06 12:24:56,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 12:24:56,458 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.011904761904762) internal successors, (253), 83 states have internal predecessors, (253), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 265 [2021-05-06 12:24:56,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:24:56,459 INFO L225 Difference]: With dead ends: 351 [2021-05-06 12:24:56,459 INFO L226 Difference]: Without dead ends: 305 [2021-05-06 12:24:56,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 11 SyntacticMatches, 153 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3999 ImplicationChecksByTransitivity, 16227.3ms TimeCoverageRelationStatistics Valid=1738, Invalid=25322, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 12:24:56,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-05-06 12:24:56,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 281. [2021-05-06 12:24:56,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 277 states have (on average 1.0541516245487366) internal successors, (292), 277 states have internal predecessors, (292), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:56,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 295 transitions. [2021-05-06 12:24:56,852 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 295 transitions. Word has length 265 [2021-05-06 12:24:56,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:24:56,852 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 295 transitions. [2021-05-06 12:24:56,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 3.011904761904762) internal successors, (253), 83 states have internal predecessors, (253), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:24:56,853 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 295 transitions. [2021-05-06 12:24:56,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-05-06 12:24:56,853 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:24:56,853 INFO L523 BasicCegarLoop]: trace histogram [79, 78, 78, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:24:56,854 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 12:24:56,854 INFO L428 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:24:56,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:24:56,854 INFO L82 PathProgramCache]: Analyzing trace with hash -254887176, now seen corresponding path program 76 times [2021-05-06 12:24:56,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:24:56,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125639350] [2021-05-06 12:24:56,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:24:56,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:24:56,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 12:24:56,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 10 HavocedVariables, 0 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:24:56,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:24:56,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:57,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:24:57,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:24:57,066 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 12:25:09,984 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:25:09,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125639350] [2021-05-06 12:25:09,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1125639350] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:25:09,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:25:09,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 12:25:09,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346127707] [2021-05-06 12:25:09,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 12:25:09,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:25:09,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 12:25:09,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=6664, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 12:25:09,985 INFO L87 Difference]: Start difference. First operand 281 states and 295 transitions. Second operand has 85 states, 85 states have (on average 3.011764705882353) internal successors, (256), 84 states have internal predecessors, (256), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)