/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-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:35:57,701 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:35:57,703 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:35:57,735 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 11:35:57,736 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 11:35:57,739 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 11:35:57,742 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 11:35:57,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 11:35:57,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 11:35:57,754 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 11:35:57,755 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 11:35:57,756 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 11:35:57,756 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:35:57,758 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:35:57,759 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:35:57,760 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:35:57,761 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:35:57,762 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:35:57,766 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:35:57,771 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:35:57,772 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:35:57,782 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:35:57,783 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:35:57,785 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:35:57,791 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 11:35:57,791 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 11:35:57,792 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 11:35:57,795 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 11:35:57,796 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 11:35:57,796 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 11:35:57,797 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 11:35:57,797 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 11:35:57,799 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 11:35:57,799 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 11:35:57,800 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 11:35:57,801 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 11:35:57,801 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 11:35:57,801 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 11:35:57,802 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:35:57,802 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:35:57,803 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:35:57,807 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:35:57,822 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:35:57,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:35:57,825 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:35:57,825 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:35:57,825 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:35:57,826 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:35:57,826 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:35:57,826 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:35:57,826 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:35:57,826 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:35:57,827 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:35:57,827 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:35:57,827 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:35:57,828 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:35:57,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:35:57,828 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:35:57,828 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:35:57,828 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:35:57,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:35:57,829 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:35:57,829 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:35:57,829 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:35:57,829 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:35:57,829 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:35:58,153 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:35:58,170 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:35:58,172 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:35:58,173 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:35:58,174 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:35:58,175 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2021-05-06 11:35:58,225 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1110ede04/cf7b565deed946a8a47b564da3f6e293/FLAG7714dff10 [2021-05-06 11:35:58,692 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:35:58,693 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2021-05-06 11:35:58,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1110ede04/cf7b565deed946a8a47b564da3f6e293/FLAG7714dff10 [2021-05-06 11:35:58,721 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1110ede04/cf7b565deed946a8a47b564da3f6e293 [2021-05-06 11:35:58,724 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:35:58,725 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:35:58,730 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:35:58,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:35:58,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:35:58,735 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ec8bec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58, skipping insertion in model container [2021-05-06 11:35:58,736 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,742 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:35:58,755 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:35:58,900 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-lit/gr2006.i[895,908] [2021-05-06 11:35:58,915 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:35:58,923 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:35:58,935 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-lit/gr2006.i[895,908] [2021-05-06 11:35:58,938 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:35:58,952 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:35:58,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58 WrapperNode [2021-05-06 11:35:58,953 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:35:58,955 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:35:58,956 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:35:58,956 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:35:58,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,973 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,989 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:58,992 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:59,004 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... [2021-05-06 11:35:59,011 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:35:59,012 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:35:59,013 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:35:59,013 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:35:59,013 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:35:59,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:35:59,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:35:59,087 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:35:59,087 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 11:35:59,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:35:59,088 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:35:59,088 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:35:59,088 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:35:59,088 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:35:59,088 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:35:59,088 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:35:59,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:35:59,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:35:59,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:35:59,091 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:35:59,091 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:35:59,091 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:35:59,370 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:35:59,370 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:35:59,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:35:59 BoogieIcfgContainer [2021-05-06 11:35:59,371 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:35:59,373 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:35:59,373 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:35:59,375 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:35:59,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:35:58" (1/3) ... [2021-05-06 11:35:59,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ae0d27f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:35:59, skipping insertion in model container [2021-05-06 11:35:59,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:58" (2/3) ... [2021-05-06 11:35:59,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ae0d27f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:35:59, skipping insertion in model container [2021-05-06 11:35:59,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:35:59" (3/3) ... [2021-05-06 11:35:59,402 INFO L111 eAbstractionObserver]: Analyzing ICFG gr2006.i [2021-05-06 11:35:59,407 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:35:59,410 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:35:59,425 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:35:59,459 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:35:59,459 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:35:59,459 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:35:59,459 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:35:59,459 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:35:59,459 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:35:59,459 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:35:59,460 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:35:59,474 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:35:59,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:35:59,480 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:59,480 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:59,481 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:59,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:59,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1795296022, now seen corresponding path program 1 times [2021-05-06 11:35:59,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:59,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869473595] [2021-05-06 11:35:59,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:59,552 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:35:59,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:59,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:59,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:59,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:59,744 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:59,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869473595] [2021-05-06 11:35:59,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1869473595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:59,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:59,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:35:59,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826139301] [2021-05-06 11:35:59,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:35:59,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:59,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:35:59,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:35:59,765 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:59,836 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-05-06 11:35:59,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:35:59,839 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:35:59,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:59,845 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:35:59,846 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:35:59,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:35:59,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:35:59,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:35:59,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-06 11:35:59,893 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-06 11:35:59,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:59,894 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-06 11:35:59,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,894 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-06 11:35:59,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:35:59,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:59,895 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:59,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:35:59,896 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:59,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:59,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1744532035, now seen corresponding path program 1 times [2021-05-06 11:35:59,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:59,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007638140] [2021-05-06 11:35:59,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:59,909 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:35:59,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:59,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:59,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:00,003 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:00,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007638140] [2021-05-06 11:36:00,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1007638140] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:00,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:00,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:36:00,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598222072] [2021-05-06 11:36:00,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:36:00,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:00,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:36:00,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:36:00,006 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:00,117 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-06 11:36:00,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:36:00,118 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:36:00,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:00,120 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:36:00,120 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 11:36:00,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 72.9ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:36:00,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 11:36:00,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2021-05-06 11:36:00,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:36:00,128 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2021-05-06 11:36:00,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:00,128 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:36:00,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,129 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:36:00,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:36:00,129 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:00,129 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:00,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:36:00,130 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:00,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:00,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1801790337, now seen corresponding path program 1 times [2021-05-06 11:36:00,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:00,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332266497] [2021-05-06 11:36:00,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:00,136 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:36:00,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:00,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:00,228 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:00,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332266497] [2021-05-06 11:36:00,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1332266497] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:00,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:00,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:36:00,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322057282] [2021-05-06 11:36:00,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:36:00,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:00,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:36:00,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:36:00,232 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:00,314 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-06 11:36:00,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:36:00,314 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:36:00,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:00,317 INFO L225 Difference]: With dead ends: 28 [2021-05-06 11:36:00,317 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:36:00,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:36:00,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:36:00,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-06 11:36:00,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 11:36:00,323 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2021-05-06 11:36:00,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:00,323 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 11:36:00,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,323 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 11:36:00,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 11:36:00,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:00,324 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:00,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:36:00,324 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:00,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:00,325 INFO L82 PathProgramCache]: Analyzing trace with hash 799073317, now seen corresponding path program 1 times [2021-05-06 11:36:00,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:00,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619967480] [2021-05-06 11:36:00,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:00,413 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:00,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:00,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:00,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:00,481 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:00,520 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:00,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:00,547 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:00,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:00,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:00,724 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:00,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619967480] [2021-05-06 11:36:00,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [619967480] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:00,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:00,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:36:00,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954818062] [2021-05-06 11:36:00,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:36:00,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:00,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:36:00,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:36:00,726 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:00,939 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-06 11:36:00,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:36:00,940 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 11:36:00,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:00,940 INFO L225 Difference]: With dead ends: 28 [2021-05-06 11:36:00,940 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:36:00,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 261.6ms TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:36:00,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:36:00,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-06 11:36:00,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-05-06 11:36:00,947 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 16 [2021-05-06 11:36:00,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:00,947 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-05-06 11:36:00,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:00,947 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-05-06 11:36:00,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:36:00,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:00,948 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:00,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:36:00,948 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:00,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:00,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1033932547, now seen corresponding path program 2 times [2021-05-06 11:36:00,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:00,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167076668] [2021-05-06 11:36:00,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:00,963 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:00,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:00,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:00,995 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:01,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:01,042 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:01,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:01,080 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:01,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:01,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:01,175 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:01,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:01,208 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:01,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:01,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:01,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:01,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:01,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:01,379 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:01,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167076668] [2021-05-06 11:36:01,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1167076668] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:01,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:01,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:36:01,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817055661] [2021-05-06 11:36:01,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:36:01,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:01,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:36:01,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:36:01,383 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:01,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:01,554 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2021-05-06 11:36:01,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:36:01,556 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 11:36:01,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:01,560 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:36:01,560 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:36:01,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 159.9ms TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:36:01,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:36:01,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-05-06 11:36:01,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:01,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-06 11:36:01,575 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2021-05-06 11:36:01,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:01,576 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-06 11:36:01,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:01,576 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-06 11:36:01,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 11:36:01,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:01,577 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:01,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:36:01,577 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:01,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:01,578 INFO L82 PathProgramCache]: Analyzing trace with hash 965362855, now seen corresponding path program 3 times [2021-05-06 11:36:01,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:01,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658664302] [2021-05-06 11:36:01,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:01,594 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:01,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:01,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:01,655 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:01,673 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:01,686 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:01,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,716 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:01,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:01,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:01,755 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:01,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:01,775 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:01,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:01,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:01,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:01,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:01,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:01,929 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:01,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658664302] [2021-05-06 11:36:01,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1658664302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:01,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:01,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:36:01,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702545526] [2021-05-06 11:36:01,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:36:01,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:01,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:36:01,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:36:01,931 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:02,093 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-06 11:36:02,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:36:02,093 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-06 11:36:02,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:02,094 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:36:02,094 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:36:02,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 145.7ms TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:36:02,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:36:02,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 11:36:02,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-05-06 11:36:02,106 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22 [2021-05-06 11:36:02,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:02,107 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-05-06 11:36:02,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,107 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-05-06 11:36:02,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:36:02,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:02,108 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:02,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:36:02,108 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:02,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:02,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1684865917, now seen corresponding path program 4 times [2021-05-06 11:36:02,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:02,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431041425] [2021-05-06 11:36:02,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:02,126 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:02,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:02,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:02,179 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:02,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:02,212 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:02,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:02,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:02,265 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:02,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:02,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:02,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:02,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:02,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:02,430 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:02,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431041425] [2021-05-06 11:36:02,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [431041425] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:02,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:02,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:36:02,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205404112] [2021-05-06 11:36:02,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:36:02,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:02,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:36:02,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:36:02,432 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:02,638 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-05-06 11:36:02,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:36:02,638 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-06 11:36:02,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:02,639 INFO L225 Difference]: With dead ends: 39 [2021-05-06 11:36:02,639 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:36:02,639 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 194.7ms TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:36:02,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:36:02,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-06 11:36:02,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-05-06 11:36:02,646 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2021-05-06 11:36:02,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:02,646 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-05-06 11:36:02,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,646 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-05-06 11:36:02,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 11:36:02,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:02,647 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:02,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:36:02,647 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:02,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:02,647 INFO L82 PathProgramCache]: Analyzing trace with hash -266410201, now seen corresponding path program 5 times [2021-05-06 11:36:02,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:02,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155509505] [2021-05-06 11:36:02,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:02,657 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:02,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:02,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:02,707 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:02,725 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:02,732 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:02,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:02,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:02,783 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:02,810 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:02,813 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:02,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:02,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:02,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:02,992 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:02,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155509505] [2021-05-06 11:36:02,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1155509505] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:02,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:02,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:36:02,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12672227] [2021-05-06 11:36:02,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:36:02,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:02,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:36:02,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:36:02,994 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:03,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:03,263 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 11:36:03,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:36:03,263 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-06 11:36:03,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:03,264 INFO L225 Difference]: With dead ends: 42 [2021-05-06 11:36:03,264 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:36:03,264 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 295.9ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:36:03,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:36:03,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-06 11:36:03,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:03,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-06 11:36:03,270 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 28 [2021-05-06 11:36:03,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:03,271 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-06 11:36:03,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:03,271 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-06 11:36:03,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:36:03,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:03,271 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:03,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:36:03,272 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:03,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:03,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1235400189, now seen corresponding path program 6 times [2021-05-06 11:36:03,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:03,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093420091] [2021-05-06 11:36:03,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:03,280 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:03,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:03,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:03,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:03,318 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:03,330 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:03,347 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:03,355 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:03,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:03,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:03,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:03,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:03,410 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:03,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:03,431 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:03,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:03,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:03,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:03,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:03,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:03,670 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:03,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093420091] [2021-05-06 11:36:03,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1093420091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:03,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:03,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:36:03,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962855029] [2021-05-06 11:36:03,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:36:03,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:03,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:36:03,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:36:03,672 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:04,000 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-05-06 11:36:04,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:36:04,001 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 11:36:04,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:04,004 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:36:04,004 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 11:36:04,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 362.0ms TimeCoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:36:04,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 11:36:04,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-06 11:36:04,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-05-06 11:36:04,020 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2021-05-06 11:36:04,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:04,020 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-05-06 11:36:04,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,021 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-05-06 11:36:04,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 11:36:04,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:04,023 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:04,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:36:04,024 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:04,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:04,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1940936281, now seen corresponding path program 7 times [2021-05-06 11:36:04,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:04,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547432833] [2021-05-06 11:36:04,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:04,033 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:04,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:04,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:04,078 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:04,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:04,101 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:04,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:04,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:04,145 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:04,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:04,168 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:04,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:04,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:04,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:04,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:04,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:04,414 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:04,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547432833] [2021-05-06 11:36:04,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [547432833] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:04,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:04,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:36:04,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115865772] [2021-05-06 11:36:04,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:36:04,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:04,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:36:04,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:36:04,417 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:04,830 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-06 11:36:04,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:36:04,831 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-06 11:36:04,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:04,831 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:36:04,831 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:36:04,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 415.8ms TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:36:04,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:36:04,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-06 11:36:04,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-06 11:36:04,839 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2021-05-06 11:36:04,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:04,839 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-06 11:36:04,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,839 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-06 11:36:04,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:36:04,840 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:04,840 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:04,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:36:04,840 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:04,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:04,840 INFO L82 PathProgramCache]: Analyzing trace with hash -996706429, now seen corresponding path program 8 times [2021-05-06 11:36:04,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:04,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480688373] [2021-05-06 11:36:04,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:04,848 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:04,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:04,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:04,889 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:04,906 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:04,911 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:04,930 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,941 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:04,944 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:04,955 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:04,972 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:04,973 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:04,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:05,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:05,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:05,204 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:05,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480688373] [2021-05-06 11:36:05,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1480688373] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:05,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:05,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:36:05,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539036938] [2021-05-06 11:36:05,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:36:05,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:05,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:36:05,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:36:05,205 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:05,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:05,734 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-06 11:36:05,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:36:05,734 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 11:36:05,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:05,735 INFO L225 Difference]: With dead ends: 51 [2021-05-06 11:36:05,735 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 11:36:05,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 507.9ms TimeCoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:36:05,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 11:36:05,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 11:36:05,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:05,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-05-06 11:36:05,742 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2021-05-06 11:36:05,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:05,743 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-05-06 11:36:05,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:05,743 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-05-06 11:36:05,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 11:36:05,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:05,743 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:05,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:36:05,744 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:05,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:05,744 INFO L82 PathProgramCache]: Analyzing trace with hash 813992999, now seen corresponding path program 9 times [2021-05-06 11:36:05,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:05,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113193055] [2021-05-06 11:36:05,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:05,758 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:05,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:05,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:05,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:05,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:05,807 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:05,825 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:05,831 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:05,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:05,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:05,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:05,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:05,876 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:05,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:05,896 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:05,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:05,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:05,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:06,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:06,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113193055] [2021-05-06 11:36:06,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2113193055] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:06,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:06,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:36:06,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491624937] [2021-05-06 11:36:06,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:36:06,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:06,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:36:06,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:36:06,203 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:06,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:06,725 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2021-05-06 11:36:06,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:36:06,725 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-06 11:36:06,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:06,726 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:36:06,726 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:36:06,727 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 570.7ms TimeCoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:36:06,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:36:06,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-06 11:36:06,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:06,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-06 11:36:06,746 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 40 [2021-05-06 11:36:06,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:06,746 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-06 11:36:06,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 20 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:06,746 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-06 11:36:06,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:36:06,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:06,748 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:06,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:36:06,748 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:06,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:06,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1428585213, now seen corresponding path program 10 times [2021-05-06 11:36:06,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:06,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281593206] [2021-05-06 11:36:06,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:06,757 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:06,759 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:06,761 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:06,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:06,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:06,802 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:06,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:06,835 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:06,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:06,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:06,848 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:06,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:06,877 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:06,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:06,897 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:06,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:06,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:06,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:06,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:06,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:07,227 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:07,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281593206] [2021-05-06 11:36:07,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1281593206] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:07,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:07,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:36:07,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122046677] [2021-05-06 11:36:07,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:36:07,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:07,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:36:07,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:36:07,229 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:07,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:07,918 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-05-06 11:36:07,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:36:07,918 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 11:36:07,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:07,921 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:36:07,921 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 11:36:07,924 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 646.2ms TimeCoverageRelationStatistics Valid=175, Invalid=1465, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:36:07,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 11:36:07,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-06 11:36:07,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:07,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-06 11:36:07,948 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-06 11:36:07,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:07,948 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-06 11:36:07,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:07,949 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-06 11:36:07,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:36:07,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:07,951 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:07,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:36:07,951 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:07,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:07,952 INFO L82 PathProgramCache]: Analyzing trace with hash -1859809625, now seen corresponding path program 11 times [2021-05-06 11:36:07,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:07,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176515732] [2021-05-06 11:36:07,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:07,965 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:07,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:07,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:07,995 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:07,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:08,009 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:08,025 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:08,031 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:08,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:08,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:08,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:08,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:08,077 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:08,092 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:08,093 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:08,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:08,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:08,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:08,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:08,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:08,466 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:08,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176515732] [2021-05-06 11:36:08,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1176515732] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:08,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:08,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:36:08,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042548713] [2021-05-06 11:36:08,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:36:08,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:08,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:36:08,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:36:08,468 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:09,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:09,188 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-05-06 11:36:09,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:36:09,188 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-06 11:36:09,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:09,189 INFO L225 Difference]: With dead ends: 60 [2021-05-06 11:36:09,189 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 11:36:09,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 739.1ms TimeCoverageRelationStatistics Valid=194, Invalid=1786, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:36:09,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 11:36:09,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-06 11:36:09,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:09,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-05-06 11:36:09,203 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 46 [2021-05-06 11:36:09,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:09,204 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-05-06 11:36:09,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:09,204 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-05-06 11:36:09,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:36:09,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:09,207 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:09,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:36:09,207 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:09,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:09,207 INFO L82 PathProgramCache]: Analyzing trace with hash 2075882115, now seen corresponding path program 12 times [2021-05-06 11:36:09,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:09,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386220354] [2021-05-06 11:36:09,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:09,217 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:09,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:09,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:09,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:09,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:09,266 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:09,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:09,288 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:09,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:09,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:09,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:09,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:09,331 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:09,348 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:09,349 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:09,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:09,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:09,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:09,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:09,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:09,744 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:09,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386220354] [2021-05-06 11:36:09,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [386220354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:09,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:09,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:36:09,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164370879] [2021-05-06 11:36:09,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:36:09,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:09,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:36:09,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=619, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:36:09,745 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:10,532 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2021-05-06 11:36:10,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:36:10,532 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 11:36:10,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:10,533 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:36:10,533 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 11:36:10,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 803.5ms TimeCoverageRelationStatistics Valid=213, Invalid=2139, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:36:10,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 11:36:10,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-06 11:36:10,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-06 11:36:10,541 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-06 11:36:10,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:10,541 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-06 11:36:10,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,542 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-06 11:36:10,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:36:10,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:10,542 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:10,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:36:10,542 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:10,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:10,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1956294951, now seen corresponding path program 13 times [2021-05-06 11:36:10,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:10,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616981199] [2021-05-06 11:36:10,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:10,549 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:10,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:10,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:10,593 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:10,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:10,614 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:10,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:10,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:10,652 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:10,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:10,668 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:10,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:10,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:10,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:10,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:10,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:11,064 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:11,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616981199] [2021-05-06 11:36:11,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [616981199] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:11,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:11,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:36:11,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5828729] [2021-05-06 11:36:11,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:36:11,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:11,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:36:11,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:36:11,066 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:11,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:11,946 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2021-05-06 11:36:11,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:36:11,947 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-06 11:36:11,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:11,947 INFO L225 Difference]: With dead ends: 66 [2021-05-06 11:36:11,947 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:36:11,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 895.5ms TimeCoverageRelationStatistics Valid=232, Invalid=2524, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:36:11,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:36:11,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-06 11:36:11,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:11,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2021-05-06 11:36:11,962 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 52 [2021-05-06 11:36:11,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:11,963 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2021-05-06 11:36:11,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:11,963 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2021-05-06 11:36:11,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:36:11,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:11,964 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:11,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:36:11,964 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:11,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:11,965 INFO L82 PathProgramCache]: Analyzing trace with hash -137019389, now seen corresponding path program 14 times [2021-05-06 11:36:11,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:11,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604984894] [2021-05-06 11:36:11,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:11,974 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:11,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:11,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:12,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:12,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:12,019 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:12,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:12,042 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:12,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:12,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:12,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:12,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:12,086 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:12,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:12,103 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:12,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:12,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:12,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:12,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:12,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:12,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:12,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604984894] [2021-05-06 11:36:12,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [604984894] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:12,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:12,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:36:12,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837961807] [2021-05-06 11:36:12,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:36:12,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:12,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:36:12,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=891, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:36:12,584 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:13,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:13,505 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-05-06 11:36:13,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:36:13,505 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-06 11:36:13,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:13,505 INFO L225 Difference]: With dead ends: 69 [2021-05-06 11:36:13,505 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 11:36:13,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 1020.6ms TimeCoverageRelationStatistics Valid=256, Invalid=3050, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:36:13,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 11:36:13,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-06 11:36:13,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:13,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-06 11:36:13,512 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2021-05-06 11:36:13,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:13,512 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-06 11:36:13,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:13,512 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-06 11:36:13,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:36:13,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:13,513 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:13,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:36:13,513 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:13,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:13,513 INFO L82 PathProgramCache]: Analyzing trace with hash 860615591, now seen corresponding path program 15 times [2021-05-06 11:36:13,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:13,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772034846] [2021-05-06 11:36:13,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:13,527 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:13,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:13,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:13,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:13,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:13,562 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:13,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:13,580 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:13,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:13,583 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:13,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:13,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:13,626 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:13,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:13,642 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:13,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:13,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:13,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:13,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:13,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:14,120 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:14,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772034846] [2021-05-06 11:36:14,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [772034846] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:14,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:14,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:36:14,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178506661] [2021-05-06 11:36:14,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:36:14,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:14,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:36:14,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=952, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:36:14,121 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:15,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:15,140 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2021-05-06 11:36:15,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:36:15,140 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-06 11:36:15,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:15,141 INFO L225 Difference]: With dead ends: 72 [2021-05-06 11:36:15,141 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 11:36:15,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1044.9ms TimeCoverageRelationStatistics Valid=270, Invalid=3390, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:36:15,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 11:36:15,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-06 11:36:15,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:15,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-05-06 11:36:15,151 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 58 [2021-05-06 11:36:15,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:15,151 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-05-06 11:36:15,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:15,152 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-05-06 11:36:15,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:36:15,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:15,152 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:15,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:36:15,152 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:15,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:15,153 INFO L82 PathProgramCache]: Analyzing trace with hash 230616451, now seen corresponding path program 16 times [2021-05-06 11:36:15,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:15,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477341846] [2021-05-06 11:36:15,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:15,160 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:15,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:15,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:15,196 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:15,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:15,215 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:15,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:15,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:15,259 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:15,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:15,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:15,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:15,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:15,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:15,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:15,821 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:15,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477341846] [2021-05-06 11:36:15,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [477341846] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:15,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:15,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:36:15,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676044328] [2021-05-06 11:36:15,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:36:15,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:15,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:36:15,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1079, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:36:15,823 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:16,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:16,872 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2021-05-06 11:36:16,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:36:16,872 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 11:36:16,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:16,873 INFO L225 Difference]: With dead ends: 75 [2021-05-06 11:36:16,873 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 11:36:16,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 1143.6ms TimeCoverageRelationStatistics Valid=289, Invalid=3871, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:36:16,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 11:36:16,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-06 11:36:16,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:16,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2021-05-06 11:36:16,882 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2021-05-06 11:36:16,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:16,882 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2021-05-06 11:36:16,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:16,882 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2021-05-06 11:36:16,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:36:16,883 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:16,883 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:16,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:36:16,883 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:16,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:16,883 INFO L82 PathProgramCache]: Analyzing trace with hash 933320231, now seen corresponding path program 17 times [2021-05-06 11:36:16,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:16,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415924456] [2021-05-06 11:36:16,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:16,892 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:16,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:16,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:16,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:16,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:16,938 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:16,953 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:16,958 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:16,972 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:16,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:16,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:16,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:16,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:17,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:17,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:17,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:17,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:17,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:17,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:17,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:17,621 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:17,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415924456] [2021-05-06 11:36:17,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1415924456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:17,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:17,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:36:17,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100908106] [2021-05-06 11:36:17,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:36:17,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:17,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:36:17,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1214, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:36:17,625 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:18,818 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2021-05-06 11:36:18,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:36:18,818 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-06 11:36:18,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:18,819 INFO L225 Difference]: With dead ends: 78 [2021-05-06 11:36:18,819 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 11:36:18,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 1272.2ms TimeCoverageRelationStatistics Valid=308, Invalid=4384, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:36:18,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 11:36:18,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-06 11:36:18,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-05-06 11:36:18,829 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 64 [2021-05-06 11:36:18,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:18,829 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-05-06 11:36:18,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,829 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-05-06 11:36:18,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:36:18,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:18,829 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:18,830 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:36:18,830 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:18,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:18,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1511029507, now seen corresponding path program 18 times [2021-05-06 11:36:18,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:18,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168403326] [2021-05-06 11:36:18,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:18,838 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:18,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:18,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:18,872 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:18,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:18,890 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:18,891 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:18,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:18,922 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:18,937 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:18,938 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:18,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:18,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:18,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:18,995 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:18,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:19,595 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:19,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168403326] [2021-05-06 11:36:19,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [168403326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:19,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:19,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:36:19,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674458601] [2021-05-06 11:36:19,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:36:19,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:19,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:36:19,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1357, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:36:19,597 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:20,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:20,885 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2021-05-06 11:36:20,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:36:20,886 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-06 11:36:20,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:20,886 INFO L225 Difference]: With dead ends: 81 [2021-05-06 11:36:20,886 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 11:36:20,887 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 1388.7ms TimeCoverageRelationStatistics Valid=327, Invalid=4929, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:36:20,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 11:36:20,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-06 11:36:20,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:20,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-06 11:36:20,895 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-06 11:36:20,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:20,895 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-06 11:36:20,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:20,895 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-06 11:36:20,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 11:36:20,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:20,896 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:20,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:36:20,896 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:20,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:20,896 INFO L82 PathProgramCache]: Analyzing trace with hash 2114115751, now seen corresponding path program 19 times [2021-05-06 11:36:20,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:20,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061745633] [2021-05-06 11:36:20,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:20,910 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:20,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:20,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:20,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:20,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:20,945 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:20,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:20,964 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:20,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:20,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:20,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:21,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:21,012 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:21,031 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:21,032 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:21,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:21,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:21,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:21,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:21,684 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:21,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061745633] [2021-05-06 11:36:21,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2061745633] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:21,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:21,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:36:21,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363923769] [2021-05-06 11:36:21,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:36:21,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:21,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:36:21,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1508, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:36:21,686 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:22,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:22,996 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2021-05-06 11:36:22,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:36:22,997 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-06 11:36:22,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:22,998 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:36:22,998 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 11:36:22,999 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1517 ImplicationChecksByTransitivity, 1426.6ms TimeCoverageRelationStatistics Valid=346, Invalid=5506, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:36:22,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 11:36:23,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-05-06 11:36:23,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:23,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2021-05-06 11:36:23,008 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 70 [2021-05-06 11:36:23,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:23,008 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2021-05-06 11:36:23,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:23,008 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2021-05-06 11:36:23,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:36:23,009 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:23,009 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:23,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:36:23,009 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:23,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:23,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1486755709, now seen corresponding path program 20 times [2021-05-06 11:36:23,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:23,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711246352] [2021-05-06 11:36:23,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:23,018 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:23,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:23,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:23,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:23,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:23,067 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:23,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:23,092 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:23,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:23,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:23,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:23,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:23,132 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:23,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:23,147 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:23,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:23,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:23,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:23,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:23,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:24,106 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:24,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711246352] [2021-05-06 11:36:24,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [711246352] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:24,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:24,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:36:24,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827541017] [2021-05-06 11:36:24,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:36:24,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:24,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:36:24,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:36:24,108 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 43 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:26,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:26,292 INFO L93 Difference]: Finished difference Result 87 states and 91 transitions. [2021-05-06 11:36:26,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:36:26,292 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 43 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 11:36:26,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:26,292 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:36:26,293 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 11:36:26,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 2187.4ms TimeCoverageRelationStatistics Valid=369, Invalid=6771, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:36:26,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 11:36:26,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-06 11:36:26,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:26,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-06 11:36:26,303 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-06 11:36:26,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:26,303 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-06 11:36:26,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.5681818181818181) internal successors, (69), 43 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:26,303 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-06 11:36:26,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:36:26,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:26,304 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:26,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:36:26,304 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:26,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:26,304 INFO L82 PathProgramCache]: Analyzing trace with hash 349731623, now seen corresponding path program 21 times [2021-05-06 11:36:26,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:26,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008424131] [2021-05-06 11:36:26,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:26,312 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:26,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:26,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:26,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:26,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:26,344 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:26,359 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:26,365 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:26,366 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:26,368 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:26,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:26,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:26,399 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:26,414 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:26,419 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:26,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:26,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:26,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:26,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:26,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:27,266 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:27,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008424131] [2021-05-06 11:36:27,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1008424131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:27,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:27,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:36:27,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700654277] [2021-05-06 11:36:27,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:36:27,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:27,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:36:27,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1920, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:36:27,267 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:28,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:28,894 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2021-05-06 11:36:28,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:36:28,895 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-06 11:36:28,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:28,895 INFO L225 Difference]: With dead ends: 90 [2021-05-06 11:36:28,895 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:36:28,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1926 ImplicationChecksByTransitivity, 1769.6ms TimeCoverageRelationStatistics Valid=389, Invalid=6921, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:36:28,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:36:28,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-05-06 11:36:28,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.04) internal successors, (78), 75 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:28,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-05-06 11:36:28,906 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 76 [2021-05-06 11:36:28,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:28,906 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-05-06 11:36:28,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:28,906 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-05-06 11:36:28,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:36:28,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:28,907 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:28,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:36:28,907 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:28,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:28,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1850422787, now seen corresponding path program 22 times [2021-05-06 11:36:28,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:28,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213553749] [2021-05-06 11:36:28,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:28,920 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:28,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:28,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:28,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:28,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:28,958 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:28,973 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:28,988 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:28,989 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:28,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:29,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:29,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:29,031 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:29,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:29,048 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:29,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:29,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:29,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:29,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:29,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:29,927 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:29,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213553749] [2021-05-06 11:36:29,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1213553749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:29,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:29,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:36:29,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291683732] [2021-05-06 11:36:29,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:36:29,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:29,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:36:29,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2009, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:36:29,928 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:31,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:31,590 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2021-05-06 11:36:31,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:36:31,591 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-06 11:36:31,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:31,591 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:36:31,591 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:36:31,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2084 ImplicationChecksByTransitivity, 1841.6ms TimeCoverageRelationStatistics Valid=403, Invalid=7429, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:36:31,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:36:31,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-06 11:36:31,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:31,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-06 11:36:31,603 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2021-05-06 11:36:31,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:31,603 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-06 11:36:31,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:31,603 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-06 11:36:31,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:36:31,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:31,604 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:31,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:36:31,604 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:31,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:31,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1668661849, now seen corresponding path program 23 times [2021-05-06 11:36:31,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:31,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094005494] [2021-05-06 11:36:31,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:31,612 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:31,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:31,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:31,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:31,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:31,646 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:31,660 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:31,665 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:31,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:31,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:31,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:31,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:31,702 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:31,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:31,718 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:31,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:31,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:31,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:31,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:31,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:32,815 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:32,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094005494] [2021-05-06 11:36:32,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1094005494] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:32,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:32,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:36:32,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25897097] [2021-05-06 11:36:32,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:36:32,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:32,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:36:32,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=2263, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:36:32,817 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 50 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:35,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:35,771 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2021-05-06 11:36:35,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:36:35,772 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 11:36:35,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:35,772 INFO L225 Difference]: With dead ends: 96 [2021-05-06 11:36:35,773 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:36:35,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 2749.2ms TimeCoverageRelationStatistics Valid=557, Invalid=8755, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:36:35,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:36:35,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-06 11:36:35,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:35,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2021-05-06 11:36:35,788 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 82 [2021-05-06 11:36:35,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:35,788 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2021-05-06 11:36:35,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:35,788 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2021-05-06 11:36:35,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:36:35,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:35,788 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:35,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:36:35,789 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:35,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:35,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1432642435, now seen corresponding path program 24 times [2021-05-06 11:36:35,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:35,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937821461] [2021-05-06 11:36:35,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:35,799 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:35,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:35,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:35,841 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:35,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:35,863 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:35,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:35,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:35,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:35,902 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:35,917 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:35,918 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:35,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:35,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:35,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:35,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:35,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:36,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:36,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937821461] [2021-05-06 11:36:37,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1937821461] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:37,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:37,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:36:37,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494601693] [2021-05-06 11:36:37,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:36:37,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:37,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:36:37,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2383, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:36:37,001 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:38,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:38,976 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2021-05-06 11:36:38,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:36:38,977 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 11:36:38,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:38,978 INFO L225 Difference]: With dead ends: 99 [2021-05-06 11:36:38,978 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:36:38,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2512 ImplicationChecksByTransitivity, 2173.9ms TimeCoverageRelationStatistics Valid=441, Invalid=8871, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:36:38,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:36:38,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-06 11:36:38,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:38,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2021-05-06 11:36:38,998 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2021-05-06 11:36:38,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:38,998 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2021-05-06 11:36:38,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.588235294117647) internal successors, (81), 50 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:38,998 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2021-05-06 11:36:38,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 11:36:38,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:38,999 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:38,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:36:38,999 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:38,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:38,999 INFO L82 PathProgramCache]: Analyzing trace with hash -947904473, now seen corresponding path program 25 times [2021-05-06 11:36:38,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:38,999 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203308581] [2021-05-06 11:36:39,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:39,006 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:39,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:39,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:39,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:39,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:39,039 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:39,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:39,059 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:39,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:39,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:39,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:39,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:39,093 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:39,108 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:39,109 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:39,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:39,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:39,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:39,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:40,201 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:40,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203308581] [2021-05-06 11:36:40,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [203308581] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:40,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:40,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:36:40,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216703025] [2021-05-06 11:36:40,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:36:40,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:40,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:36:40,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=2684, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:36:40,202 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:42,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:42,374 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2021-05-06 11:36:42,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:36:42,374 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2021-05-06 11:36:42,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:42,375 INFO L225 Difference]: With dead ends: 102 [2021-05-06 11:36:42,375 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:36:42,376 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2790 ImplicationChecksByTransitivity, 2353.8ms TimeCoverageRelationStatistics Valid=465, Invalid=9837, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:36:42,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:36:42,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-06 11:36:42,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:42,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-05-06 11:36:42,389 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 88 [2021-05-06 11:36:42,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:42,389 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-05-06 11:36:42,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:42,389 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-05-06 11:36:42,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 11:36:42,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:42,390 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:42,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:36:42,390 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:42,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:42,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1320849149, now seen corresponding path program 26 times [2021-05-06 11:36:42,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:42,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009139605] [2021-05-06 11:36:42,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:42,396 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:42,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:42,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:42,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:42,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:42,436 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:42,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:42,457 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:42,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:42,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:42,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:42,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:42,498 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:42,514 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:42,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:42,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:42,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:42,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:42,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:42,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:43,674 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:43,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009139605] [2021-05-06 11:36:43,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1009139605] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:43,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:43,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:36:43,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745348434] [2021-05-06 11:36:43,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:36:43,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:43,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:36:43,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2895, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:36:43,675 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:45,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:45,993 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2021-05-06 11:36:45,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:36:45,993 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-06 11:36:45,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:45,994 INFO L225 Difference]: With dead ends: 105 [2021-05-06 11:36:45,994 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:36:45,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3031 ImplicationChecksByTransitivity, 2518.6ms TimeCoverageRelationStatistics Valid=484, Invalid=10646, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:36:45,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:36:46,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-05-06 11:36:46,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:46,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-06 11:36:46,009 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-06 11:36:46,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:46,009 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-06 11:36:46,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:46,009 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-06 11:36:46,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:36:46,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:46,010 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:46,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:36:46,010 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:46,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:46,010 INFO L82 PathProgramCache]: Analyzing trace with hash -635297113, now seen corresponding path program 27 times [2021-05-06 11:36:46,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:46,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428913242] [2021-05-06 11:36:46,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:46,017 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:46,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:46,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:46,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:46,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:46,056 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:46,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:46,084 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:46,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:46,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:46,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:46,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:46,118 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:46,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:46,134 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:46,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:46,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:46,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:46,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:46,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:47,335 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:47,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428913242] [2021-05-06 11:36:47,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [428913242] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:47,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:47,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:36:47,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480690648] [2021-05-06 11:36:47,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:36:47,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:47,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:36:47,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3004, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:36:47,337 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:49,814 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2021-05-06 11:36:49,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:36:49,814 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-06 11:36:49,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:49,814 INFO L225 Difference]: With dead ends: 108 [2021-05-06 11:36:49,814 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:36:49,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3229 ImplicationChecksByTransitivity, 2600.1ms TimeCoverageRelationStatistics Valid=498, Invalid=11274, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:36:49,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:36:49,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-05-06 11:36:49,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.032258064516129) internal successors, (96), 93 states have internal predecessors, (96), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2021-05-06 11:36:49,829 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 94 [2021-05-06 11:36:49,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:49,830 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2021-05-06 11:36:49,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,830 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2021-05-06 11:36:49,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:36:49,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:49,830 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:49,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:36:49,831 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:49,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:49,831 INFO L82 PathProgramCache]: Analyzing trace with hash 75914883, now seen corresponding path program 28 times [2021-05-06 11:36:49,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:49,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397192953] [2021-05-06 11:36:49,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:49,839 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:49,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:49,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:49,874 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:49,889 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:49,895 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:49,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:49,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:49,942 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:49,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:49,957 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:49,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:49,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:49,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:50,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:50,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:51,233 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:51,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397192953] [2021-05-06 11:36:51,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [397192953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:51,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:51,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:36:51,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836723821] [2021-05-06 11:36:51,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:36:51,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:51,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:36:51,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=3227, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:36:51,235 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:53,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:53,711 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2021-05-06 11:36:53,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:36:53,711 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 11:36:53,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:53,712 INFO L225 Difference]: With dead ends: 111 [2021-05-06 11:36:53,712 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 11:36:53,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3488 ImplicationChecksByTransitivity, 2700.2ms TimeCoverageRelationStatistics Valid=517, Invalid=12139, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:36:53,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 11:36:53,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-06 11:36:53,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:53,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-06 11:36:53,729 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-06 11:36:53,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:53,729 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-06 11:36:53,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:53,729 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-06 11:36:53,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 11:36:53,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:53,730 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:53,730 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:36:53,730 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:53,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:53,730 INFO L82 PathProgramCache]: Analyzing trace with hash 718816551, now seen corresponding path program 29 times [2021-05-06 11:36:53,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:53,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110322816] [2021-05-06 11:36:53,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:53,735 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:53,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:53,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:53,771 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:53,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:53,789 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:53,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:53,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:53,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:53,823 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:53,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:53,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:53,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:53,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:53,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:53,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:53,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:55,202 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:55,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110322816] [2021-05-06 11:36:55,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2110322816] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:55,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:55,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:36:55,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960144880] [2021-05-06 11:36:55,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:36:55,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:55,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:36:55,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3458, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:36:55,204 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 61 states, 61 states have (on average 1.5737704918032787) internal successors, (96), 60 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:57,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:57,880 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2021-05-06 11:36:57,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:36:57,881 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.5737704918032787) internal successors, (96), 60 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-05-06 11:36:57,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:57,881 INFO L225 Difference]: With dead ends: 114 [2021-05-06 11:36:57,881 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 11:36:57,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3757 ImplicationChecksByTransitivity, 2842.1ms TimeCoverageRelationStatistics Valid=536, Invalid=13036, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:36:57,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 11:36:57,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2021-05-06 11:36:57,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 99 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:57,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2021-05-06 11:36:57,895 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 100 [2021-05-06 11:36:57,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:57,895 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2021-05-06 11:36:57,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.5737704918032787) internal successors, (96), 60 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:57,896 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2021-05-06 11:36:57,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:36:57,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:57,896 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:57,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:36:57,896 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:57,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:57,896 INFO L82 PathProgramCache]: Analyzing trace with hash 2143235075, now seen corresponding path program 30 times [2021-05-06 11:36:57,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:57,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162765110] [2021-05-06 11:36:57,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:57,901 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:36:57,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:57,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:57,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:36:57,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:36:57,936 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:36:57,951 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:57,954 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:36:57,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:57,957 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:57,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:36:57,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:36:57,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:36:58,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:58,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:36:58,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:58,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:58,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:58,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:58,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:59,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:59,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162765110] [2021-05-06 11:36:59,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [162765110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:59,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:59,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:36:59,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900918462] [2021-05-06 11:36:59,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:36:59,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:59,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:36:59,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=3819, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:36:59,542 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:02,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:02,348 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-05-06 11:37:02,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:37:02,349 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:37:02,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:02,349 INFO L225 Difference]: With dead ends: 117 [2021-05-06 11:37:02,350 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:37:02,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4095 ImplicationChecksByTransitivity, 3146.5ms TimeCoverageRelationStatistics Valid=560, Invalid=14202, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:37:02,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:37:02,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-06 11:37:02,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:02,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-06 11:37:02,366 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2021-05-06 11:37:02,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:02,366 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-06 11:37:02,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:02,366 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-06 11:37:02,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-06 11:37:02,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:02,366 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:02,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:37:02,367 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:02,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:02,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1576368217, now seen corresponding path program 31 times [2021-05-06 11:37:02,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:02,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837485615] [2021-05-06 11:37:02,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:02,374 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:02,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:02,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:02,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:02,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:02,409 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:02,423 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:02,427 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:02,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:02,442 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:02,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:02,453 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:02,462 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:02,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:02,477 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:02,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:02,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:02,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:02,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:03,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:03,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837485615] [2021-05-06 11:37:03,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [837485615] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:03,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:03,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:37:03,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475987956] [2021-05-06 11:37:03,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:37:03,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:03,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:37:03,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=4070, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:37:03,998 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:06,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:06,882 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2021-05-06 11:37:06,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:37:06,882 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 106 [2021-05-06 11:37:06,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:06,883 INFO L225 Difference]: With dead ends: 120 [2021-05-06 11:37:06,883 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 11:37:06,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4386 ImplicationChecksByTransitivity, 3175.1ms TimeCoverageRelationStatistics Valid=579, Invalid=15171, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 11:37:06,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 11:37:06,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2021-05-06 11:37:06,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 105 states have (on average 1.0285714285714285) internal successors, (108), 105 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:06,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-05-06 11:37:06,901 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 106 [2021-05-06 11:37:06,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:06,901 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-05-06 11:37:06,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:06,901 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-05-06 11:37:06,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 11:37:06,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:06,902 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:06,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:37:06,902 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:06,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:06,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2121803389, now seen corresponding path program 32 times [2021-05-06 11:37:06,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:06,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936953546] [2021-05-06 11:37:06,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:06,908 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:06,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:06,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:06,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:06,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:06,945 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:06,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:06,965 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:06,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:06,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:06,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:07,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:07,010 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:07,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:07,029 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:07,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:07,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:07,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:07,077 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 11:37:07,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:08,619 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:08,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936953546] [2021-05-06 11:37:08,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [936953546] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:08,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:08,620 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:37:08,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049811694] [2021-05-06 11:37:08,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:37:08,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:08,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:37:08,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=4199, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:37:08,621 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 67 states, 67 states have (on average 1.5671641791044777) internal successors, (105), 66 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:11,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:11,665 INFO L93 Difference]: Finished difference Result 123 states and 127 transitions. [2021-05-06 11:37:11,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:37:11,665 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.5671641791044777) internal successors, (105), 66 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-06 11:37:11,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:11,666 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:37:11,666 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 11:37:11,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4624 ImplicationChecksByTransitivity, 3308.0ms TimeCoverageRelationStatistics Valid=593, Invalid=15919, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:37:11,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 11:37:11,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-05-06 11:37:11,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:11,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2021-05-06 11:37:11,683 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2021-05-06 11:37:11,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:11,683 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2021-05-06 11:37:11,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.5671641791044777) internal successors, (105), 66 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:11,684 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2021-05-06 11:37:11,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-06 11:37:11,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:11,684 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:11,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2021-05-06 11:37:11,685 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:11,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:11,685 INFO L82 PathProgramCache]: Analyzing trace with hash 975235623, now seen corresponding path program 33 times [2021-05-06 11:37:11,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:11,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572481318] [2021-05-06 11:37:11,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:11,694 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:11,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:11,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:11,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:11,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:11,736 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:11,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:11,767 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:11,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:11,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:11,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:11,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:11,805 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:11,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:11,821 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:11,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:11,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:11,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:11,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:11,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:13,503 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:13,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572481318] [2021-05-06 11:37:13,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [572481318] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:13,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:13,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:37:13,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271731425] [2021-05-06 11:37:13,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:37:13,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:13,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:37:13,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=4596, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:37:13,504 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 69 states, 69 states have (on average 1.565217391304348) internal successors, (108), 68 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:16,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:16,766 INFO L93 Difference]: Finished difference Result 126 states and 130 transitions. [2021-05-06 11:37:16,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:37:16,767 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.565217391304348) internal successors, (108), 68 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-05-06 11:37:16,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:16,768 INFO L225 Difference]: With dead ends: 126 [2021-05-06 11:37:16,768 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 11:37:16,769 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4998 ImplicationChecksByTransitivity, 3506.7ms TimeCoverageRelationStatistics Valid=617, Invalid=17205, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 11:37:16,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 11:37:16,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2021-05-06 11:37:16,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 states have internal predecessors, (114), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:16,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2021-05-06 11:37:16,784 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 112 [2021-05-06 11:37:16,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:16,784 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2021-05-06 11:37:16,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.565217391304348) internal successors, (108), 68 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:16,785 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2021-05-06 11:37:16,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:37:16,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:16,785 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:16,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2021-05-06 11:37:16,785 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:16,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:16,786 INFO L82 PathProgramCache]: Analyzing trace with hash 376989443, now seen corresponding path program 34 times [2021-05-06 11:37:16,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:16,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590964163] [2021-05-06 11:37:16,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:16,790 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:16,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:16,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:16,821 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:16,835 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:16,851 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:16,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:16,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:16,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:16,889 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:16,905 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:16,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:16,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:16,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:16,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:16,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:16,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:19,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:19,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590964163] [2021-05-06 11:37:19,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [590964163] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:19,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:19,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:37:19,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228383492] [2021-05-06 11:37:19,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:37:19,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:19,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:37:19,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=4975, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:37:19,223 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 72 states, 72 states have (on average 1.5416666666666667) internal successors, (111), 71 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:24,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:24,466 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2021-05-06 11:37:24,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 11:37:24,467 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.5416666666666667) internal successors, (111), 71 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 11:37:24,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:24,468 INFO L225 Difference]: With dead ends: 129 [2021-05-06 11:37:24,468 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:37:24,469 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2746 ImplicationChecksByTransitivity, 5234.7ms TimeCoverageRelationStatistics Valid=829, Invalid=19193, Unknown=0, NotChecked=0, Total=20022 [2021-05-06 11:37:24,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:37:24,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-05-06 11:37:24,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:24,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-06 11:37:24,490 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-06 11:37:24,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:24,490 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-06 11:37:24,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.5416666666666667) internal successors, (111), 71 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:24,490 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-06 11:37:24,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 11:37:24,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:24,491 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:24,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2021-05-06 11:37:24,491 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:24,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:24,491 INFO L82 PathProgramCache]: Analyzing trace with hash 2139319463, now seen corresponding path program 35 times [2021-05-06 11:37:24,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:24,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729813485] [2021-05-06 11:37:24,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:24,497 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:24,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:24,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:24,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:24,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:24,535 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:24,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:24,557 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:24,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:24,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:24,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:24,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:24,589 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:24,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:24,604 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:24,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:24,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:24,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:24,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:24,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:26,481 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:26,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729813485] [2021-05-06 11:37:26,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [729813485] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:26,481 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:26,481 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:37:26,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234985181] [2021-05-06 11:37:26,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:37:26,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:26,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:37:26,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=5012, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:37:26,482 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:30,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:30,093 INFO L93 Difference]: Finished difference Result 132 states and 136 transitions. [2021-05-06 11:37:30,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:37:30,093 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 118 [2021-05-06 11:37:30,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:30,094 INFO L225 Difference]: With dead ends: 132 [2021-05-06 11:37:30,094 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 11:37:30,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5581 ImplicationChecksByTransitivity, 3923.1ms TimeCoverageRelationStatistics Valid=650, Invalid=19090, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 11:37:30,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 11:37:30,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2021-05-06 11:37:30,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:30,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2021-05-06 11:37:30,116 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2021-05-06 11:37:30,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:30,116 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2021-05-06 11:37:30,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:30,116 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2021-05-06 11:37:30,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 11:37:30,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:30,117 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:30,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2021-05-06 11:37:30,117 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:30,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:30,117 INFO L82 PathProgramCache]: Analyzing trace with hash 2032718979, now seen corresponding path program 36 times [2021-05-06 11:37:30,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:30,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275029968] [2021-05-06 11:37:30,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:30,123 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:30,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:30,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:30,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:30,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:30,163 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:30,178 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:30,183 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:30,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:30,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:30,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:30,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:30,220 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:30,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:30,235 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:30,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:30,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:30,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:30,274 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:30,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:32,144 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:32,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275029968] [2021-05-06 11:37:32,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1275029968] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:32,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:32,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:37:32,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071271089] [2021-05-06 11:37:32,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:37:32,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:32,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:37:32,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=5299, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:37:32,146 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:35,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:35,841 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2021-05-06 11:37:35,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:37:35,842 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-06 11:37:35,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:35,842 INFO L225 Difference]: With dead ends: 135 [2021-05-06 11:37:35,842 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 11:37:35,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5920 ImplicationChecksByTransitivity, 4008.7ms TimeCoverageRelationStatistics Valid=669, Invalid=20211, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 11:37:35,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 11:37:35,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-05-06 11:37:35,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:35,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-06 11:37:35,862 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-06 11:37:35,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:35,862 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-06 11:37:35,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:35,862 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-06 11:37:35,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-06 11:37:35,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:35,863 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:35,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 11:37:35,863 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:35,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:35,863 INFO L82 PathProgramCache]: Analyzing trace with hash 278531879, now seen corresponding path program 37 times [2021-05-06 11:37:35,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:35,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077135411] [2021-05-06 11:37:35,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:35,869 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:35,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:35,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:35,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:35,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:35,905 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:35,919 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:35,923 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:35,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:35,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:35,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:35,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:35,972 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:35,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:35,988 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:35,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:36,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:36,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:36,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:36,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:38,053 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:38,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077135411] [2021-05-06 11:37:38,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1077135411] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:38,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:38,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 11:37:38,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454169648] [2021-05-06 11:37:38,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 11:37:38,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:38,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 11:37:38,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=5744, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:37:38,054 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:41,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:41,908 INFO L93 Difference]: Finished difference Result 138 states and 142 transitions. [2021-05-06 11:37:41,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:37:41,908 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-05-06 11:37:41,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:41,909 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:37:41,909 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:37:41,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6342 ImplicationChecksByTransitivity, 4263.5ms TimeCoverageRelationStatistics Valid=693, Invalid=21657, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 11:37:41,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:37:41,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2021-05-06 11:37:41,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.024390243902439) internal successors, (126), 123 states have internal predecessors, (126), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:41,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2021-05-06 11:37:41,930 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 124 [2021-05-06 11:37:41,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:41,930 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2021-05-06 11:37:41,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:41,930 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2021-05-06 11:37:41,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 11:37:41,931 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:41,931 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:41,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2021-05-06 11:37:41,931 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:41,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:41,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1842273789, now seen corresponding path program 38 times [2021-05-06 11:37:41,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:41,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539674462] [2021-05-06 11:37:41,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:41,940 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:41,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:41,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:41,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:41,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:41,974 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:41,988 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:41,992 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:42,006 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:42,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:42,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:42,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:42,025 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:42,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:42,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:42,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:42,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:42,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:42,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:44,170 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:44,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539674462] [2021-05-06 11:37:44,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [539674462] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:44,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:44,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:37:44,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781425224] [2021-05-06 11:37:44,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:37:44,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:44,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:37:44,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=5897, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:37:44,172 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:48,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:48,271 INFO L93 Difference]: Finished difference Result 141 states and 145 transitions. [2021-05-06 11:37:48,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:37:48,272 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 127 [2021-05-06 11:37:48,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:48,273 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:37:48,273 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:37:48,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6628 ImplicationChecksByTransitivity, 4383.9ms TimeCoverageRelationStatistics Valid=707, Invalid=22549, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 11:37:48,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:37:48,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-05-06 11:37:48,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:48,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-06 11:37:48,304 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 127 [2021-05-06 11:37:48,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:48,304 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-06 11:37:48,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:48,304 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-06 11:37:48,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 11:37:48,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:48,305 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:48,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2021-05-06 11:37:48,305 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:48,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:48,305 INFO L82 PathProgramCache]: Analyzing trace with hash 499962279, now seen corresponding path program 39 times [2021-05-06 11:37:48,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:48,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436457050] [2021-05-06 11:37:48,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:48,311 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:48,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:48,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:48,348 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:48,365 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:48,369 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:48,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:48,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:48,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:48,422 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:48,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:48,444 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:48,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:48,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:48,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:48,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:48,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:50,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:50,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436457050] [2021-05-06 11:37:50,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1436457050] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:50,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:50,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:37:50,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965045969] [2021-05-06 11:37:50,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:37:50,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:50,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:37:50,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=6366, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:37:50,954 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:55,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:55,271 INFO L93 Difference]: Finished difference Result 144 states and 148 transitions. [2021-05-06 11:37:55,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:37:55,271 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-05-06 11:37:55,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:55,272 INFO L225 Difference]: With dead ends: 144 [2021-05-06 11:37:55,272 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 11:37:55,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7074 ImplicationChecksByTransitivity, 4878.0ms TimeCoverageRelationStatistics Valid=731, Invalid=24075, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 11:37:55,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 11:37:55,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2021-05-06 11:37:55,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:55,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2021-05-06 11:37:55,300 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 130 [2021-05-06 11:37:55,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:55,300 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2021-05-06 11:37:55,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:55,301 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2021-05-06 11:37:55,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:37:55,301 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:55,301 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:55,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2021-05-06 11:37:55,301 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:55,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:55,302 INFO L82 PathProgramCache]: Analyzing trace with hash 2015973251, now seen corresponding path program 40 times [2021-05-06 11:37:55,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:55,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359633706] [2021-05-06 11:37:55,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:55,309 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:37:55,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:55,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:55,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:37:55,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:37:55,349 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:37:55,365 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:55,370 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:37:55,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:55,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:55,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:37:55,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:37:55,416 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:37:55,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:55,433 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:37:55,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:55,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:55,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:55,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:55,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:57,835 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:57,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359633706] [2021-05-06 11:37:57,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [359633706] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:57,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:57,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 11:37:57,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845733607] [2021-05-06 11:37:57,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 11:37:57,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:57,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 11:37:57,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=6527, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:37:57,837 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 83 states, 83 states have (on average 1.5542168674698795) internal successors, (129), 82 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:02,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:02,297 INFO L93 Difference]: Finished difference Result 147 states and 151 transitions. [2021-05-06 11:38:02,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:38:02,297 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.5542168674698795) internal successors, (129), 82 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 11:38:02,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:02,298 INFO L225 Difference]: With dead ends: 147 [2021-05-06 11:38:02,298 INFO L226 Difference]: Without dead ends: 138 [2021-05-06 11:38:02,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7376 ImplicationChecksByTransitivity, 4876.8ms TimeCoverageRelationStatistics Valid=745, Invalid=25015, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:38:02,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-06 11:38:02,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2021-05-06 11:38:02,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:02,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2021-05-06 11:38:02,321 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 133 [2021-05-06 11:38:02,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:02,322 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2021-05-06 11:38:02,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 83 states have (on average 1.5542168674698795) internal successors, (129), 82 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:02,322 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2021-05-06 11:38:02,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-05-06 11:38:02,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:02,323 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:02,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2021-05-06 11:38:02,323 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:02,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:02,323 INFO L82 PathProgramCache]: Analyzing trace with hash -377244633, now seen corresponding path program 41 times [2021-05-06 11:38:02,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:02,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234948416] [2021-05-06 11:38:02,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:02,329 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:02,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:02,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:02,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:02,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:02,362 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:02,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:02,380 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:02,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:02,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:02,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:02,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:02,428 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:02,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:02,443 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:02,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:02,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:02,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:02,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:02,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:05,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:05,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234948416] [2021-05-06 11:38:05,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1234948416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:05,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:05,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:38:05,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509333690] [2021-05-06 11:38:05,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:38:05,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:05,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:38:05,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=6854, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:38:05,038 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:09,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:09,678 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2021-05-06 11:38:09,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:38:09,678 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 136 [2021-05-06 11:38:09,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:09,679 INFO L225 Difference]: With dead ends: 150 [2021-05-06 11:38:09,679 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 11:38:09,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7765 ImplicationChecksByTransitivity, 5173.1ms TimeCoverageRelationStatistics Valid=764, Invalid=26296, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 11:38:09,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 11:38:09,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2021-05-06 11:38:09,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 135 states have internal predecessors, (138), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:09,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2021-05-06 11:38:09,701 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 136 [2021-05-06 11:38:09,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:09,702 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2021-05-06 11:38:09,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:09,702 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2021-05-06 11:38:09,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-06 11:38:09,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:09,702 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:09,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 11:38:09,702 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:09,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:09,703 INFO L82 PathProgramCache]: Analyzing trace with hash -274113277, now seen corresponding path program 42 times [2021-05-06 11:38:09,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:09,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086608912] [2021-05-06 11:38:09,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:09,708 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:09,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:09,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:09,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:09,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:09,749 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:09,764 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:09,781 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:09,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:09,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:09,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:09,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:09,819 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:09,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:09,835 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:09,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:09,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:09,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:09,877 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 11:38:09,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:12,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:12,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086608912] [2021-05-06 11:38:12,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086608912] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:12,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:12,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:38:12,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176891538] [2021-05-06 11:38:12,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:38:12,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:12,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:38:12,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=7317, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:38:12,997 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand has 88 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 87 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:21,177 INFO L93 Difference]: Finished difference Result 153 states and 157 transitions. [2021-05-06 11:38:21,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 11:38:21,177 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 87 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-06 11:38:21,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:21,178 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:38:21,178 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:38:21,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3818 ImplicationChecksByTransitivity, 7545.8ms TimeCoverageRelationStatistics Valid=1013, Invalid=28743, Unknown=0, NotChecked=0, Total=29756 [2021-05-06 11:38:21,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:38:21,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2021-05-06 11:38:21,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-06 11:38:21,200 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-06 11:38:21,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:21,200 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-06 11:38:21,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 87 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,200 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-06 11:38:21,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-05-06 11:38:21,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:21,201 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:21,201 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127 [2021-05-06 11:38:21,201 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:21,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:21,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1210496679, now seen corresponding path program 43 times [2021-05-06 11:38:21,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:21,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18130881] [2021-05-06 11:38:21,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:21,208 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:21,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:21,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:21,245 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:21,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:21,265 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:21,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:21,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:21,311 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:21,328 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:21,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:21,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:21,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:21,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:21,368 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 11:38:21,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:23,985 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:23,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18130881] [2021-05-06 11:38:23,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [18130881] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:23,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:23,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 11:38:23,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053448426] [2021-05-06 11:38:23,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 11:38:23,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:23,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 11:38:23,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=7706, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:38:23,987 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:29,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:29,083 INFO L93 Difference]: Finished difference Result 156 states and 160 transitions. [2021-05-06 11:38:29,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:38:29,083 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 142 [2021-05-06 11:38:29,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:29,084 INFO L225 Difference]: With dead ends: 156 [2021-05-06 11:38:29,084 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 11:38:29,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8658 ImplicationChecksByTransitivity, 5524.0ms TimeCoverageRelationStatistics Valid=807, Invalid=29295, Unknown=0, NotChecked=0, Total=30102 [2021-05-06 11:38:29,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 11:38:29,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2021-05-06 11:38:29,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.0212765957446808) internal successors, (144), 141 states have internal predecessors, (144), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:29,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2021-05-06 11:38:29,117 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 142 [2021-05-06 11:38:29,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:29,117 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2021-05-06 11:38:29,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:29,117 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2021-05-06 11:38:29,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 11:38:29,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:29,118 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:29,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130 [2021-05-06 11:38:29,118 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:29,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:29,119 INFO L82 PathProgramCache]: Analyzing trace with hash -347518333, now seen corresponding path program 44 times [2021-05-06 11:38:29,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:29,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134886303] [2021-05-06 11:38:29,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:29,128 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:29,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:29,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:29,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:29,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:29,167 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:29,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:29,200 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:29,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:29,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:29,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:29,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:29,241 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:29,258 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:29,259 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:29,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:29,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:29,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:29,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:29,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:32,108 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:32,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134886303] [2021-05-06 11:38:32,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1134886303] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:32,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:32,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:38:32,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619991657] [2021-05-06 11:38:32,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:38:32,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:32,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:38:32,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=7883, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:38:32,109 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:37,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:37,372 INFO L93 Difference]: Finished difference Result 159 states and 163 transitions. [2021-05-06 11:38:37,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:38:37,373 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-06 11:38:37,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:37,373 INFO L225 Difference]: With dead ends: 159 [2021-05-06 11:38:37,373 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 11:38:37,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8992 ImplicationChecksByTransitivity, 5785.0ms TimeCoverageRelationStatistics Valid=821, Invalid=30331, Unknown=0, NotChecked=0, Total=31152 [2021-05-06 11:38:37,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 11:38:37,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-06 11:38:37,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:37,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-06 11:38:37,396 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-06 11:38:37,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:37,396 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-06 11:38:37,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:37,396 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-06 11:38:37,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-06 11:38:37,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:37,397 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:37,397 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133 [2021-05-06 11:38:37,397 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:37,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:37,397 INFO L82 PathProgramCache]: Analyzing trace with hash 538827047, now seen corresponding path program 45 times [2021-05-06 11:38:37,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:37,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047177158] [2021-05-06 11:38:37,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:37,402 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:37,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:37,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:37,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:37,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:37,441 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:37,455 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:37,458 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:37,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:37,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:37,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:37,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:37,497 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:37,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:37,513 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:37,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:37,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:37,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:37,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:37,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:40,565 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:40,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047177158] [2021-05-06 11:38:40,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1047177158] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:40,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:40,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2021-05-06 11:38:40,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038193556] [2021-05-06 11:38:40,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2021-05-06 11:38:40,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:40,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-05-06 11:38:40,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=8424, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:38:40,567 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:45,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:45,923 INFO L93 Difference]: Finished difference Result 162 states and 166 transitions. [2021-05-06 11:38:45,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 11:38:45,924 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 148 [2021-05-06 11:38:45,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:45,924 INFO L225 Difference]: With dead ends: 162 [2021-05-06 11:38:45,924 INFO L226 Difference]: Without dead ends: 153 [2021-05-06 11:38:45,926 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9510 ImplicationChecksByTransitivity, 6052.8ms TimeCoverageRelationStatistics Valid=845, Invalid=32097, Unknown=0, NotChecked=0, Total=32942 [2021-05-06 11:38:45,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-06 11:38:45,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2021-05-06 11:38:45,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:45,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2021-05-06 11:38:45,959 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 148 [2021-05-06 11:38:45,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:45,959 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2021-05-06 11:38:45,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:45,959 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2021-05-06 11:38:45,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 11:38:45,960 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:45,960 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:45,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2021-05-06 11:38:45,960 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:45,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:45,960 INFO L82 PathProgramCache]: Analyzing trace with hash 195106819, now seen corresponding path program 46 times [2021-05-06 11:38:45,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:45,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399202459] [2021-05-06 11:38:45,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:45,967 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:45,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:45,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:45,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:45,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:46,006 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:46,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:46,026 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:46,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:46,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:46,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:46,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:46,061 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:46,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:46,085 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:46,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:46,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:46,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:46,127 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 11:38:46,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:49,139 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:49,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399202459] [2021-05-06 11:38:49,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [399202459] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:49,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:49,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 11:38:49,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054530841] [2021-05-06 11:38:49,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 11:38:49,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:49,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 11:38:49,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=8609, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:38:49,140 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 95 states, 95 states have (on average 1.5473684210526315) internal successors, (147), 94 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:54,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:54,733 INFO L93 Difference]: Finished difference Result 165 states and 169 transitions. [2021-05-06 11:38:54,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 11:38:54,734 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.5473684210526315) internal successors, (147), 94 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-06 11:38:54,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:54,735 INFO L225 Difference]: With dead ends: 165 [2021-05-06 11:38:54,735 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:38:54,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9860 ImplicationChecksByTransitivity, 6163.0ms TimeCoverageRelationStatistics Valid=859, Invalid=33181, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:38:54,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:38:54,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2021-05-06 11:38:54,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:54,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-06 11:38:54,761 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 151 [2021-05-06 11:38:54,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:54,761 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-06 11:38:54,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 1.5473684210526315) internal successors, (147), 94 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:54,761 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-06 11:38:54,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-06 11:38:54,762 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:54,762 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:54,762 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 11:38:54,762 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:54,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:54,762 INFO L82 PathProgramCache]: Analyzing trace with hash -372171865, now seen corresponding path program 47 times [2021-05-06 11:38:54,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:54,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61021825] [2021-05-06 11:38:54,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:54,766 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:38:54,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:54,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:54,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:38:54,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:38:54,798 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:38:54,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:54,816 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:38:54,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:54,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:54,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:38:54,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:38:54,851 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:38:54,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:54,866 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:38:54,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:54,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:54,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:54,935 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 11:38:54,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:58,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:58,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61021825] [2021-05-06 11:38:58,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [61021825] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:58,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:58,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:38:58,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492026835] [2021-05-06 11:38:58,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:38:58,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:58,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:38:58,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=9411, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:38:58,789 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 98 states, 98 states have (on average 1.530612244897959) internal successors, (150), 97 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:08,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:08,344 INFO L93 Difference]: Finished difference Result 168 states and 172 transitions. [2021-05-06 11:39:08,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:39:08,344 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.530612244897959) internal successors, (150), 97 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 154 [2021-05-06 11:39:08,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:08,345 INFO L225 Difference]: With dead ends: 168 [2021-05-06 11:39:08,345 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 11:39:08,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4743 ImplicationChecksByTransitivity, 9103.1ms TimeCoverageRelationStatistics Valid=855, Invalid=36201, Unknown=0, NotChecked=0, Total=37056 [2021-05-06 11:39:08,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 11:39:08,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2021-05-06 11:39:08,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:08,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 160 transitions. [2021-05-06 11:39:08,386 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 160 transitions. Word has length 154 [2021-05-06 11:39:08,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:08,386 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 160 transitions. [2021-05-06 11:39:08,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.530612244897959) internal successors, (150), 97 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:08,387 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 160 transitions. [2021-05-06 11:39:08,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 11:39:08,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:08,387 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:08,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2021-05-06 11:39:08,387 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:08,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:08,388 INFO L82 PathProgramCache]: Analyzing trace with hash 524862851, now seen corresponding path program 48 times [2021-05-06 11:39:08,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:08,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367365811] [2021-05-06 11:39:08,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:08,396 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:39:08,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:08,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:08,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:39:08,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:39:08,431 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:39:08,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:08,448 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:08,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:08,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:08,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:39:08,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:39:08,478 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:39:08,493 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:08,493 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:08,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:08,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:08,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:08,536 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 11:39:08,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:11,731 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:11,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367365811] [2021-05-06 11:39:11,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1367365811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:11,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:11,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2021-05-06 11:39:11,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928865401] [2021-05-06 11:39:11,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2021-05-06 11:39:11,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:11,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-05-06 11:39:11,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=9367, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:39:11,732 INFO L87 Difference]: Start difference. First operand 158 states and 160 transitions. Second operand has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:17,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:17,843 INFO L93 Difference]: Finished difference Result 171 states and 175 transitions. [2021-05-06 11:39:17,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:39:17,843 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-05-06 11:39:17,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:17,844 INFO L225 Difference]: With dead ends: 171 [2021-05-06 11:39:17,844 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 11:39:17,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10768 ImplicationChecksByTransitivity, 6649.9ms TimeCoverageRelationStatistics Valid=897, Invalid=36159, Unknown=0, NotChecked=0, Total=37056 [2021-05-06 11:39:17,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 11:39:17,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-05-06 11:39:17,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:17,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2021-05-06 11:39:17,870 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 157 [2021-05-06 11:39:17,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:17,870 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2021-05-06 11:39:17,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:17,871 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2021-05-06 11:39:17,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-06 11:39:17,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:17,871 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:17,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145 [2021-05-06 11:39:17,871 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:17,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:17,872 INFO L82 PathProgramCache]: Analyzing trace with hash 799571495, now seen corresponding path program 49 times [2021-05-06 11:39:17,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:17,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797632701] [2021-05-06 11:39:17,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:17,878 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:39:17,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:17,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:17,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:39:17,916 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:39:17,926 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:39:17,942 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:17,946 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:17,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:17,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:17,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:39:17,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:39:17,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:39:17,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:17,997 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:18,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:18,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:18,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:18,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:18,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:21,346 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:21,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797632701] [2021-05-06 11:39:21,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [797632701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:21,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:21,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 11:39:21,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461445252] [2021-05-06 11:39:21,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 11:39:21,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:21,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 11:39:21,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=9758, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:39:21,348 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 101 states, 101 states have (on average 1.5445544554455446) internal successors, (156), 100 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:27,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:27,783 INFO L93 Difference]: Finished difference Result 180 states and 186 transitions. [2021-05-06 11:39:27,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-06 11:39:27,784 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.5445544554455446) internal successors, (156), 100 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-05-06 11:39:27,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:27,784 INFO L225 Difference]: With dead ends: 180 [2021-05-06 11:39:27,784 INFO L226 Difference]: Without dead ends: 171 [2021-05-06 11:39:27,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11716 ImplicationChecksByTransitivity, 6966.7ms TimeCoverageRelationStatistics Valid=935, Invalid=38865, Unknown=0, NotChecked=0, Total=39800 [2021-05-06 11:39:27,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-05-06 11:39:27,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 164. [2021-05-06 11:39:27,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0188679245283019) internal successors, (162), 159 states have internal predecessors, (162), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:27,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2021-05-06 11:39:27,825 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2021-05-06 11:39:27,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:27,825 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2021-05-06 11:39:27,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 101 states, 101 states have (on average 1.5445544554455446) internal successors, (156), 100 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:27,825 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2021-05-06 11:39:27,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 11:39:27,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:27,826 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:27,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2021-05-06 11:39:27,826 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:27,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:27,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1562881277, now seen corresponding path program 50 times [2021-05-06 11:39:27,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:27,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355045968] [2021-05-06 11:39:27,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:27,832 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:39:27,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:27,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:27,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:39:27,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:39:27,879 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:39:27,898 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:27,901 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:27,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:27,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:27,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:39:27,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:39:27,934 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:39:27,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:27,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:27,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:27,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:27,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:28,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:32,314 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:32,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355045968] [2021-05-06 11:39:32,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [355045968] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:32,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:32,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:39:32,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885792416] [2021-05-06 11:39:32,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:39:32,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:32,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:39:32,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=10309, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:39:32,316 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand has 104 states, 104 states have (on average 1.5288461538461537) internal successors, (159), 103 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:43,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:43,116 INFO L93 Difference]: Finished difference Result 177 states and 181 transitions. [2021-05-06 11:39:43,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-06 11:39:43,116 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.5288461538461537) internal successors, (159), 103 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 163 [2021-05-06 11:39:43,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:43,117 INFO L225 Difference]: With dead ends: 177 [2021-05-06 11:39:43,117 INFO L226 Difference]: Without dead ends: 168 [2021-05-06 11:39:43,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5348 ImplicationChecksByTransitivity, 10275.9ms TimeCoverageRelationStatistics Valid=1205, Invalid=40615, Unknown=0, NotChecked=0, Total=41820 [2021-05-06 11:39:43,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-06 11:39:43,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2021-05-06 11:39:43,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0185185185185186) internal successors, (165), 162 states have internal predecessors, (165), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:43,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-05-06 11:39:43,157 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 163 [2021-05-06 11:39:43,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:43,157 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-05-06 11:39:43,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 104 states have (on average 1.5288461538461537) internal successors, (159), 103 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:43,157 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-05-06 11:39:43,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-05-06 11:39:43,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:43,158 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:43,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2021-05-06 11:39:43,158 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:43,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:43,159 INFO L82 PathProgramCache]: Analyzing trace with hash 235667623, now seen corresponding path program 51 times [2021-05-06 11:39:43,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:43,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651144435] [2021-05-06 11:39:43,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:43,164 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:39:43,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:43,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:43,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:39:43,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:39:43,199 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:39:43,216 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:43,235 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:43,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:43,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:43,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:39:43,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:39:43,271 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:39:43,288 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:43,289 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:43,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:43,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:43,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:43,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:43,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:47,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:47,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651144435] [2021-05-06 11:39:47,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [651144435] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:47,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:47,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2021-05-06 11:39:47,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988325221] [2021-05-06 11:39:47,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 107 states [2021-05-06 11:39:47,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:47,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-05-06 11:39:47,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=11185, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:39:47,022 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:54,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:54,271 INFO L93 Difference]: Finished difference Result 186 states and 193 transitions. [2021-05-06 11:39:54,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-06 11:39:54,272 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 166 [2021-05-06 11:39:54,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:54,273 INFO L225 Difference]: With dead ends: 186 [2021-05-06 11:39:54,273 INFO L226 Difference]: Without dead ends: 174 [2021-05-06 11:39:54,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13800 ImplicationChecksByTransitivity, 7678.1ms TimeCoverageRelationStatistics Valid=1015, Invalid=44141, Unknown=0, NotChecked=0, Total=45156 [2021-05-06 11:39:54,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-06 11:39:54,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 170. [2021-05-06 11:39:54,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:54,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2021-05-06 11:39:54,307 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 166 [2021-05-06 11:39:54,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:54,307 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2021-05-06 11:39:54,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:54,307 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2021-05-06 11:39:54,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 11:39:54,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:54,308 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 50, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:54,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2021-05-06 11:39:54,308 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:54,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:54,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1347095361, now seen corresponding path program 52 times [2021-05-06 11:39:54,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:54,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771897470] [2021-05-06 11:39:54,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:54,313 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:39:54,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:54,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:54,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:39:54,339 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:39:54,347 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:39:54,362 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:54,365 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:39:54,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:54,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:54,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:39:54,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:39:54,398 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:39:54,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:54,414 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:39:54,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:54,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:54,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:54,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:54,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:58,316 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:58,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771897470] [2021-05-06 11:39:58,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1771897470] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:58,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:58,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2021-05-06 11:39:58,316 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985322070] [2021-05-06 11:39:58,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 109 states [2021-05-06 11:39:58,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:58,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-05-06 11:39:58,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=11400, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:39:58,318 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 109 states, 109 states have (on average 1.5137614678899083) internal successors, (165), 108 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:05,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:05,774 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2021-05-06 11:40:05,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:40:05,774 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.5137614678899083) internal successors, (165), 108 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 169 [2021-05-06 11:40:05,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:05,775 INFO L225 Difference]: With dead ends: 186 [2021-05-06 11:40:05,775 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 11:40:05,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14521 ImplicationChecksByTransitivity, 7883.8ms TimeCoverageRelationStatistics Valid=1033, Invalid=45839, Unknown=0, NotChecked=0, Total=46872 [2021-05-06 11:40:05,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 11:40:05,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2021-05-06 11:40:05,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0119047619047619) internal successors, (170), 168 states have internal predecessors, (170), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:05,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 174 transitions. [2021-05-06 11:40:05,804 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 174 transitions. Word has length 169 [2021-05-06 11:40:05,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:05,804 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 174 transitions. [2021-05-06 11:40:05,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 109 states, 109 states have (on average 1.5137614678899083) internal successors, (165), 108 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:05,805 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 174 transitions. [2021-05-06 11:40:05,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-05-06 11:40:05,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:05,805 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 50, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:05,805 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable157 [2021-05-06 11:40:05,805 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:05,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:05,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1987953255, now seen corresponding path program 53 times [2021-05-06 11:40:05,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:05,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333897009] [2021-05-06 11:40:05,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:05,810 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:40:05,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:05,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:05,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:40:05,835 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:40:05,843 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:40:05,858 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:05,861 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:40:05,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:05,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:05,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:40:05,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:40:05,891 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:40:05,906 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:05,907 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:40:05,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:05,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:05,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:05,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:05,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:09,868 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:09,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333897009] [2021-05-06 11:40:09,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333897009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:09,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:09,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2021-05-06 11:40:09,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934041399] [2021-05-06 11:40:09,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2021-05-06 11:40:09,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:09,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-05-06 11:40:09,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=11833, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:40:09,870 INFO L87 Difference]: Start difference. First operand 173 states and 174 transitions. Second operand has 111 states, 111 states have (on average 1.5135135135135136) internal successors, (168), 110 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:17,135 INFO L93 Difference]: Finished difference Result 189 states and 194 transitions. [2021-05-06 11:40:17,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-05-06 11:40:17,136 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.5135135135135136) internal successors, (168), 110 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-05-06 11:40:17,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:17,136 INFO L225 Difference]: With dead ends: 189 [2021-05-06 11:40:17,136 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 11:40:17,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15149 ImplicationChecksByTransitivity, 8050.3ms TimeCoverageRelationStatistics Valid=1048, Invalid=47572, Unknown=0, NotChecked=0, Total=48620 [2021-05-06 11:40:17,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 11:40:17,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 176. [2021-05-06 11:40:17,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.0116959064327486) internal successors, (173), 171 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 177 transitions. [2021-05-06 11:40:17,170 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 177 transitions. Word has length 172 [2021-05-06 11:40:17,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:17,170 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 177 transitions. [2021-05-06 11:40:17,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 111 states, 111 states have (on average 1.5135135135135136) internal successors, (168), 110 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,170 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 177 transitions. [2021-05-06 11:40:17,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-06 11:40:17,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:17,170 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 50, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:17,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable160 [2021-05-06 11:40:17,171 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:17,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:17,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1639124607, now seen corresponding path program 54 times [2021-05-06 11:40:17,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:17,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775529874] [2021-05-06 11:40:17,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:17,175 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size [2021-05-06 11:40:17,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:40:17,199 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:40:17,208 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 91.7 percent of original size 66 [2021-05-06 11:40:17,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:17,225 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:40:17,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-06 11:40:17,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-05-06 11:40:17,258 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 71 [2021-05-06 11:40:17,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:17,273 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:40:17,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:17,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:17,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:17,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:17,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:22,305 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:22,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775529874] [2021-05-06 11:40:22,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [775529874] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:22,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:22,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2021-05-06 11:40:22,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115695277] [2021-05-06 11:40:22,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-06 11:40:22,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:22,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-06 11:40:22,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=12773, Unknown=0, NotChecked=0, Total=13110 [2021-05-06 11:40:22,307 INFO L87 Difference]: Start difference. First operand 176 states and 177 transitions. Second operand has 114 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:33,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:33,867 INFO L93 Difference]: Finished difference Result 178 states and 179 transitions. [2021-05-06 11:40:33,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-06 11:40:33,867 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 175 [2021-05-06 11:40:33,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:33,867 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:40:33,867 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 11:40:33,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8511 ImplicationChecksByTransitivity, 11324.7ms TimeCoverageRelationStatistics Valid=882, Invalid=49070, Unknown=0, NotChecked=0, Total=49952 [2021-05-06 11:40:33,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 11:40:33,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 11:40:33,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 11:40:33,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 11:40:33,869 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 175 [2021-05-06 11:40:33,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:33,869 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 11:40:33,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:33,870 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 11:40:33,870 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 11:40:33,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163 [2021-05-06 11:40:33,871 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 11:40:34,106 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 342 DAG size of output: 326 [2021-05-06 11:40:35,505 WARN L205 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 494 DAG size of output: 420 [2021-05-06 11:40:35,684 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 337 DAG size of output: 324 [2021-05-06 11:40:36,394 WARN L205 SmtUtils]: Spent 654.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 37 [2021-05-06 11:40:39,810 WARN L205 SmtUtils]: Spent 3.41 s on a formula simplification. DAG size of input: 381 DAG size of output: 29 [2021-05-06 11:40:40,353 WARN L205 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 18 [2021-05-06 11:40:40,360 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 12) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point L12-1(line 12) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string0.offset| |old(#t~string0.offset)|) (= |old(#length)| |#length|) (= |#t~string1.base| |old(#t~string1.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string0.base| |old(#t~string0.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|) (= |#t~string1.offset| |old(#t~string1.offset)|)) [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point L15(line 15) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 14 16) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point L15-2(lines 14 16) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 14 16) no Hoare annotation was computed. [2021-05-06 11:40:40,361 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 24 39) the Hoare annotation is: true [2021-05-06 11:40:40,361 INFO L194 CegarLoopUtils]: At program point L29(lines 29 33) the Hoare annotation is: (or (and (< main_~x~0 51) (or (and (= main_~y~0 main_~x~0) (< 1 main_~x~0)) (and (= main_~y~0 1) (= main_~x~0 1)))) (and (= main_~y~0 0) (= main_~x~0 0))) [2021-05-06 11:40:40,361 INFO L194 CegarLoopUtils]: At program point L29-2(lines 28 36) the Hoare annotation is: (or (and (< main_~x~0 50) (<= 1 main_~y~0) (= (+ main_~x~0 1) main_~y~0)) (and (= main_~y~0 48) (= 51 main_~x~0)) (and (= 49 main_~y~0) (= main_~x~0 50)) (and (= 53 main_~x~0) (= main_~y~0 46)) (and (= main_~x~0 52) (= main_~y~0 47))) [2021-05-06 11:40:40,361 INFO L194 CegarLoopUtils]: At program point L28-2(lines 28 36) the Hoare annotation is: (or (and (< main_~x~0 51) (or (and (= main_~y~0 main_~x~0) (< 1 main_~x~0)) (and (= main_~y~0 1) (= main_~x~0 1)))) (and (= main_~y~0 0) (= main_~x~0 0)) (and (= main_~y~0 46) (= main_~x~0 54)) (and (= 53 main_~x~0) (= main_~y~0 47)) (and (= main_~x~0 52) (= main_~y~0 48)) (and (= 49 main_~y~0) (= 51 main_~x~0))) [2021-05-06 11:40:40,362 INFO L194 CegarLoopUtils]: At program point L28-3(lines 28 36) the Hoare annotation is: false [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point mainEXIT(lines 24 39) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point mainFINAL(lines 24 39) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point L37(line 37) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point L18-2(lines 17 22) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 17 22) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertEXIT(lines 17 22) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point L19(line 19) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) the Hoare annotation is: true [2021-05-06 11:40:40,362 INFO L201 CegarLoopUtils]: At program point L18(lines 18 20) the Hoare annotation is: true [2021-05-06 11:40:40,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:40:40 BoogieIcfgContainer [2021-05-06 11:40:40,375 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:40:40,375 INFO L168 Benchmark]: Toolchain (without parser) took 281649.94 ms. Allocated memory was 198.2 MB in the beginning and 595.6 MB in the end (delta: 397.4 MB). Free memory was 163.8 MB in the beginning and 420.3 MB in the end (delta: -256.5 MB). Peak memory consumption was 366.3 MB. Max. memory is 8.0 GB. [2021-05-06 11:40:40,375 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 198.2 MB. Free memory is still 180.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:40:40,376 INFO L168 Benchmark]: CACSL2BoogieTranslator took 223.46 ms. Allocated memory is still 198.2 MB. Free memory was 163.5 MB in the beginning and 154.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 11:40:40,376 INFO L168 Benchmark]: Boogie Preprocessor took 55.92 ms. Allocated memory is still 198.2 MB. Free memory was 153.9 MB in the beginning and 181.4 MB in the end (delta: -27.5 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. [2021-05-06 11:40:40,376 INFO L168 Benchmark]: RCFGBuilder took 358.97 ms. Allocated memory is still 198.2 MB. Free memory was 181.4 MB in the beginning and 167.2 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-06 11:40:40,376 INFO L168 Benchmark]: TraceAbstraction took 281001.92 ms. Allocated memory was 198.2 MB in the beginning and 595.6 MB in the end (delta: 397.4 MB). Free memory was 166.7 MB in the beginning and 420.3 MB in the end (delta: -253.5 MB). Peak memory consumption was 369.3 MB. Max. memory is 8.0 GB. [2021-05-06 11:40:40,376 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 198.2 MB. Free memory is still 180.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 223.46 ms. Allocated memory is still 198.2 MB. Free memory was 163.5 MB in the beginning and 154.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 55.92 ms. Allocated memory is still 198.2 MB. Free memory was 153.9 MB in the beginning and 181.4 MB in the end (delta: -27.5 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. * RCFGBuilder took 358.97 ms. Allocated memory is still 198.2 MB. Free memory was 181.4 MB in the beginning and 167.2 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 281001.92 ms. Allocated memory was 198.2 MB in the beginning and 595.6 MB in the end (delta: 397.4 MB). Free memory was 166.7 MB in the beginning and 420.3 MB in the end (delta: -253.5 MB). Peak memory consumption was 369.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 274413.6ms, OverallIterations: 57, TraceHistogramMax: 55, EmptinessCheckTime: 47.1ms, AutomataDifference: 177458.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 6490.0ms, InitialAbstractionConstructionTime: 7.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 2114 SDtfs, 3758 SDslu, 3501 SDs, 0 SdLazy, 205338 SolverSat, 7212 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 55447.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8095 GetRequests, 2113 SyntacticMatches, 2 SemanticMatches, 5980 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227587 ImplicationChecksByTransitivity, 186094.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=176occurred in iteration=56, InterpolantAutomatonStates: 3083, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 968.7ms AutomataMinimizationTime, 57 MinimizatonAttempts, 74 StatesRemovedByMinimization, 55 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 21 LocationsWithAnnotation, 357 PreInvPairs, 637 NumberOfFragments, 165 HoareAnnotationTreeSize, 357 FomulaSimplifications, 7755200649721437 FormulaSimplificationTreeSizeReduction, 1844.8ms HoareSimplificationTime, 21 FomulaSimplificationsInter, 23315623427741 FormulaSimplificationTreeSizeReductionInter, 4628.9ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: (((((x < 51 && ((y == x && 1 < x) || (y == 1 && x == 1))) || (y == 0 && x == 0)) || (y == 46 && x == 54)) || (53 == x && y == 47)) || (x == 52 && y == 48)) || (49 == y && 51 == x) - ProcedureContractResult [Line: 24]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 17]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 RESULT: Ultimate proved your program to be correct! Received shutdown request...