/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/loops/eureka_05.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:01:36,771 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:01:36,773 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:01:36,802 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 23:01:36,803 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 23:01:36,805 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 23:01:36,807 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 23:01:36,811 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 23:01:36,812 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 23:01:36,816 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 23:01:36,816 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 23:01:36,817 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 23:01:36,817 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 23:01:36,819 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 23:01:36,820 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 23:01:36,821 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 23:01:36,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 23:01:36,823 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 23:01:36,825 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 23:01:36,829 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 23:01:36,831 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 23:01:36,832 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 23:01:36,833 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 23:01:36,834 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 23:01:36,842 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 23:01:36,843 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 23:01:36,843 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 23:01:36,844 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 23:01:36,844 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 23:01:36,845 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 23:01:36,845 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 23:01:36,846 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 23:01:36,847 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 23:01:36,847 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 23:01:36,848 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 23:01:36,848 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 23:01:36,848 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 23:01:36,849 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 23:01:36,849 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:01:36,849 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:01:36,850 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:01:36,852 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:01:36,860 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:01:36,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:01:36,863 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:01:36,863 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:01:36,864 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:01:36,864 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:01:36,864 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:01:36,864 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:01:36,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:01:36,865 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:01:36,865 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:01:36,866 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:01:36,866 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:01:37,095 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:01:37,109 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:01:37,111 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:01:37,112 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:01:37,113 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:01:37,113 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_05.i [2021-05-02 23:01:37,158 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e3afbd8a/e61048f109804386a27ae5f6c0a8b081/FLAG9ba2c21c6 [2021-05-02 23:01:37,484 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:01:37,485 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_05.i [2021-05-02 23:01:37,490 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e3afbd8a/e61048f109804386a27ae5f6c0a8b081/FLAG9ba2c21c6 [2021-05-02 23:01:37,901 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e3afbd8a/e61048f109804386a27ae5f6c0a8b081 [2021-05-02 23:01:37,903 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:01:37,905 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:01:37,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:01:37,908 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:01:37,911 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:01:37,911 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:01:37" (1/1) ... [2021-05-02 23:01:37,912 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@174397a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:37, skipping insertion in model container [2021-05-02 23:01:37,912 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:01:37" (1/1) ... [2021-05-02 23:01:37,917 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:01:37,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:01:38,023 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_05.i[810,823] [2021-05-02 23:01:38,034 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:01:38,039 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:01:38,047 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_05.i[810,823] [2021-05-02 23:01:38,051 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:01:38,061 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:01:38,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38 WrapperNode [2021-05-02 23:01:38,061 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:01:38,062 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:01:38,062 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:01:38,062 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:01:38,075 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,080 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,080 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,097 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,101 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,102 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,103 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:01:38,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:01:38,104 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:01:38,104 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:01:38,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (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 [2021-05-02 23:01:38,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:01:38,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:01:38,175 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:01:38,175 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:01:38,175 INFO L138 BoogieDeclarations]: Found implementation of procedure SelectionSort [2021-05-02 23:01:38,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:01:38,176 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:01:38,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:01:38,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:01:38,176 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:01:38,176 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:01:38,177 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:01:38,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:01:38,177 INFO L130 BoogieDeclarations]: Found specification of procedure SelectionSort [2021-05-02 23:01:38,177 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:01:38,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:01:38,178 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:01:38,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:01:38,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:01:38,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:01:38,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:01:38,403 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:01:38,403 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-05-02 23:01:38,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:01:38 BoogieIcfgContainer [2021-05-02 23:01:38,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:01:38,405 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:01:38,405 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:01:38,407 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:01:38,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:01:37" (1/3) ... [2021-05-02 23:01:38,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@694c57d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:01:38, skipping insertion in model container [2021-05-02 23:01:38,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (2/3) ... [2021-05-02 23:01:38,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@694c57d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:01:38, skipping insertion in model container [2021-05-02 23:01:38,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:01:38" (3/3) ... [2021-05-02 23:01:38,409 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_05.i [2021-05-02 23:01:38,412 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:01:38,414 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:01:38,442 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:01:38,468 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:01:38,469 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:01:38,469 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:01:38,469 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:01:38,469 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:01:38,469 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:01:38,469 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:01:38,469 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:01:38,478 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 25 states have internal predecessors, (35), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:01:38,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 23:01:38,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:38,484 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:38,485 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:38,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:38,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1995632546, now seen corresponding path program 1 times [2021-05-02 23:01:38,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:38,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892817606] [2021-05-02 23:01:38,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:38,545 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:38,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:38,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:38,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:38,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 23:01:38,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:38,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:38,740 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:38,740 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892817606] [2021-05-02 23:01:38,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1892817606] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:38,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:38,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 23:01:38,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916402689] [2021-05-02 23:01:38,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 23:01:38,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:38,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 23:01:38,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:01:38,756 INFO L87 Difference]: Start difference. First operand has 34 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 25 states have internal predecessors, (35), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:38,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:38,938 INFO L93 Difference]: Finished difference Result 77 states and 109 transitions. [2021-05-02 23:01:38,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 23:01:38,940 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-02 23:01:38,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:38,946 INFO L225 Difference]: With dead ends: 77 [2021-05-02 23:01:38,946 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 23:01:38,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 71.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:01:38,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 23:01:38,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2021-05-02 23:01:38,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:38,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-02 23:01:38,987 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 18 [2021-05-02 23:01:38,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:38,987 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-02 23:01:38,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:38,988 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-02 23:01:38,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 23:01:38,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:38,990 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:38,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:01:38,991 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:38,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:38,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1221136232, now seen corresponding path program 1 times [2021-05-02 23:01:38,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:38,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972118883] [2021-05-02 23:01:38,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:38,997 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 23:01:39,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,083 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972118883] [2021-05-02 23:01:39,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [972118883] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 23:01:39,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723306243] [2021-05-02 23:01:39,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 23:01:39,085 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 23:01:39,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:01:39,085 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:39,256 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2021-05-02 23:01:39,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:01:39,257 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-02 23:01:39,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:39,258 INFO L225 Difference]: With dead ends: 59 [2021-05-02 23:01:39,258 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:01:39,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 79.4ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:01:39,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:01:39,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2021-05-02 23:01:39,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:39,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-02 23:01:39,269 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 18 [2021-05-02 23:01:39,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:39,270 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-02 23:01:39,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,270 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-02 23:01:39,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 23:01:39,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,271 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:01:39,271 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,272 INFO L82 PathProgramCache]: Analyzing trace with hash -957735862, now seen corresponding path program 1 times [2021-05-02 23:01:39,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039652401] [2021-05-02 23:01:39,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,287 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:39,290 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-05-02 23:01:39,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,383 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039652401] [2021-05-02 23:01:39,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1039652401] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:01:39,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479394512] [2021-05-02 23:01:39,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:01:39,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:01:39,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:01:39,384 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:39,526 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2021-05-02 23:01:39,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 23:01:39,526 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 23:01:39,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:39,528 INFO L225 Difference]: With dead ends: 61 [2021-05-02 23:01:39,528 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 23:01:39,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 53.3ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:39,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 23:01:39,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2021-05-02 23:01:39,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:39,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 23:01:39,537 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 20 [2021-05-02 23:01:39,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:39,537 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 23:01:39,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,537 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 23:01:39,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:01:39,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,538 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:01:39,538 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1090222252, now seen corresponding path program 2 times [2021-05-02 23:01:39,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315803517] [2021-05-02 23:01:39,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,544 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:39,545 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:39,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,642 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315803517] [2021-05-02 23:01:39,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [315803517] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:01:39,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905987395] [2021-05-02 23:01:39,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:01:39,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:01:39,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:01:39,644 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:39,869 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 23:01:39,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:39,870 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-05-02 23:01:39,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:39,871 INFO L225 Difference]: With dead ends: 51 [2021-05-02 23:01:39,871 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:01:39,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 154.4ms TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:01:39,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:01:39,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 33. [2021-05-02 23:01:39,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:39,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-02 23:01:39,884 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 22 [2021-05-02 23:01:39,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:39,885 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-02 23:01:39,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,885 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-02 23:01:39,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 23:01:39,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,887 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:01:39,887 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,887 INFO L82 PathProgramCache]: Analyzing trace with hash -911525692, now seen corresponding path program 1 times [2021-05-02 23:01:39,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286512716] [2021-05-02 23:01:39,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,893 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:39,895 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:39,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,985 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286512716] [2021-05-02 23:01:39,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1286512716] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:01:39,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023465792] [2021-05-02 23:01:39,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:39,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:39,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:39,987 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:40,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:40,262 INFO L93 Difference]: Finished difference Result 60 states and 71 transitions. [2021-05-02 23:01:40,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:01:40,263 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-05-02 23:01:40,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:40,264 INFO L225 Difference]: With dead ends: 60 [2021-05-02 23:01:40,264 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 23:01:40,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 194.3ms TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:01:40,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 23:01:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2021-05-02 23:01:40,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:40,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 23:01:40,281 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 26 [2021-05-02 23:01:40,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:40,283 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 23:01:40,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:40,284 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 23:01:40,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:01:40,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:40,286 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:40,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:01:40,286 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:40,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:40,287 INFO L82 PathProgramCache]: Analyzing trace with hash -588044416, now seen corresponding path program 1 times [2021-05-02 23:01:40,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:40,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10947132] [2021-05-02 23:01:40,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:40,293 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:40,294 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:40,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:40,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:40,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:40,386 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:40,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10947132] [2021-05-02 23:01:40,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [10947132] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:40,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:40,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:01:40,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605092742] [2021-05-02 23:01:40,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:40,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:40,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:40,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:40,387 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 8 states, 7 states have (on average 3.0) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:40,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:40,604 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2021-05-02 23:01:40,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:01:40,606 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-05-02 23:01:40,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:40,607 INFO L225 Difference]: With dead ends: 58 [2021-05-02 23:01:40,607 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 23:01:40,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 151.5ms TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:01:40,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 23:01:40,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2021-05-02 23:01:40,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:40,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-02 23:01:40,613 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 29 [2021-05-02 23:01:40,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:40,613 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-02 23:01:40,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:40,613 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-02 23:01:40,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:01:40,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:40,614 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:40,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:01:40,614 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:40,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:40,615 INFO L82 PathProgramCache]: Analyzing trace with hash 835149208, now seen corresponding path program 2 times [2021-05-02 23:01:40,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:40,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961201787] [2021-05-02 23:01:40,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:40,618 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:40,618 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:40,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:40,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:40,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:40,702 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:40,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961201787] [2021-05-02 23:01:40,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1961201787] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:40,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:40,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:40,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468094501] [2021-05-02 23:01:40,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:01:40,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:40,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:01:40,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:40,703 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:41,005 INFO L93 Difference]: Finished difference Result 69 states and 83 transitions. [2021-05-02 23:01:41,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:01:41,006 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2021-05-02 23:01:41,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:41,006 INFO L225 Difference]: With dead ends: 69 [2021-05-02 23:01:41,006 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:01:41,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 220.9ms TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:01:41,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:01:41,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2021-05-02 23:01:41,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 33 states have internal predecessors, (40), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:41,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-05-02 23:01:41,012 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 33 [2021-05-02 23:01:41,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:41,012 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-05-02 23:01:41,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,013 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-05-02 23:01:41,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 23:01:41,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:41,013 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:41,013 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:01:41,013 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:41,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:41,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1075110444, now seen corresponding path program 3 times [2021-05-02 23:01:41,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:41,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616134207] [2021-05-02 23:01:41,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:41,017 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:41,017 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:41,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:41,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:41,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:41,084 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:41,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616134207] [2021-05-02 23:01:41,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1616134207] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:41,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:41,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:41,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120585693] [2021-05-02 23:01:41,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:01:41,085 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:41,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:01:41,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:41,086 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:41,373 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2021-05-02 23:01:41,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:01:41,373 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2021-05-02 23:01:41,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:41,374 INFO L225 Difference]: With dead ends: 69 [2021-05-02 23:01:41,374 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 23:01:41,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 212.6ms TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:01:41,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 23:01:41,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2021-05-02 23:01:41,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 36 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:41,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2021-05-02 23:01:41,380 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 36 [2021-05-02 23:01:41,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:41,380 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2021-05-02 23:01:41,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,380 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2021-05-02 23:01:41,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:01:41,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:41,381 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:41,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:01:41,381 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:41,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:41,382 INFO L82 PathProgramCache]: Analyzing trace with hash 482252264, now seen corresponding path program 4 times [2021-05-02 23:01:41,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:41,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885071454] [2021-05-02 23:01:41,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:41,386 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:41,388 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:41,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:41,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:41,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:41,476 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:41,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885071454] [2021-05-02 23:01:41,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [885071454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:41,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:41,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:41,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346382639] [2021-05-02 23:01:41,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:41,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:41,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:41,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:41,478 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:41,757 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2021-05-02 23:01:41,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:01:41,757 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-05-02 23:01:41,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:41,758 INFO L225 Difference]: With dead ends: 72 [2021-05-02 23:01:41,758 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 23:01:41,758 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 211.7ms TimeCoverageRelationStatistics Valid=102, Invalid=240, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:01:41,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 23:01:41,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 23:01:41,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:41,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 23:01:41,764 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2021-05-02 23:01:41,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:41,764 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 23:01:41,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:41,764 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 23:01:41,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 23:01:41,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:41,765 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:41,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:01:41,765 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:41,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:41,765 INFO L82 PathProgramCache]: Analyzing trace with hash -450266964, now seen corresponding path program 5 times [2021-05-02 23:01:41,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:41,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494705493] [2021-05-02 23:01:41,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:41,769 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:41,769 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:41,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:41,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:41,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:41,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:41,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494705493] [2021-05-02 23:01:41,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1494705493] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:41,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:41,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:41,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027468147] [2021-05-02 23:01:41,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:41,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:41,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:41,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:41,854 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:42,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:42,205 INFO L93 Difference]: Finished difference Result 75 states and 89 transitions. [2021-05-02 23:01:42,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:01:42,205 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 42 [2021-05-02 23:01:42,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:42,206 INFO L225 Difference]: With dead ends: 75 [2021-05-02 23:01:42,206 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:01:42,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 279.5ms TimeCoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:01:42,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:01:42,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-05-02 23:01:42,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 42 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:42,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2021-05-02 23:01:42,213 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 42 [2021-05-02 23:01:42,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:42,213 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2021-05-02 23:01:42,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:42,213 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2021-05-02 23:01:42,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:01:42,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:42,214 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:42,214 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:01:42,214 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:42,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:42,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1282117784, now seen corresponding path program 6 times [2021-05-02 23:01:42,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:42,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667354804] [2021-05-02 23:01:42,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:42,217 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:42,218 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:42,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:42,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:42,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:42,291 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:42,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667354804] [2021-05-02 23:01:42,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1667354804] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:42,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:42,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:42,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050896351] [2021-05-02 23:01:42,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:42,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:42,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:42,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:42,293 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:42,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:42,682 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2021-05-02 23:01:42,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:01:42,682 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2021-05-02 23:01:42,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:42,683 INFO L225 Difference]: With dead ends: 79 [2021-05-02 23:01:42,683 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 23:01:42,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 283.4ms TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:01:42,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 23:01:42,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 53. [2021-05-02 23:01:42,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:42,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2021-05-02 23:01:42,700 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 45 [2021-05-02 23:01:42,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:42,701 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2021-05-02 23:01:42,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:42,701 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2021-05-02 23:01:42,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:01:42,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:42,704 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:42,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:01:42,704 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:42,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:42,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1463860828, now seen corresponding path program 7 times [2021-05-02 23:01:42,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:42,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626443159] [2021-05-02 23:01:42,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:42,707 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:42,708 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:42,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:42,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:42,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:42,784 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:42,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626443159] [2021-05-02 23:01:42,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [626443159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:42,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:42,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:42,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424572569] [2021-05-02 23:01:42,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:42,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:42,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:42,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:42,785 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 11 states, 10 states have (on average 3.1) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:43,223 INFO L93 Difference]: Finished difference Result 82 states and 100 transitions. [2021-05-02 23:01:43,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:01:43,224 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 48 [2021-05-02 23:01:43,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:43,224 INFO L225 Difference]: With dead ends: 82 [2021-05-02 23:01:43,224 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 23:01:43,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 328.4ms TimeCoverageRelationStatistics Valid=157, Invalid=395, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:01:43,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 23:01:43,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2021-05-02 23:01:43,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:43,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 23:01:43,231 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 48 [2021-05-02 23:01:43,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:43,231 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 23:01:43,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,232 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 23:01:43,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:01:43,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:43,232 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:43,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:01:43,232 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:43,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:43,233 INFO L82 PathProgramCache]: Analyzing trace with hash 670604008, now seen corresponding path program 8 times [2021-05-02 23:01:43,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:43,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690513185] [2021-05-02 23:01:43,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:43,236 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:43,236 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:43,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:43,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:43,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:43,304 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:43,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690513185] [2021-05-02 23:01:43,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [690513185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:43,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:43,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:43,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909865819] [2021-05-02 23:01:43,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:01:43,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:43,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:01:43,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:43,305 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:43,569 INFO L93 Difference]: Finished difference Result 80 states and 96 transitions. [2021-05-02 23:01:43,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:01:43,570 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 51 [2021-05-02 23:01:43,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:43,570 INFO L225 Difference]: With dead ends: 80 [2021-05-02 23:01:43,570 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 23:01:43,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 181.2ms TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:01:43,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 23:01:43,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2021-05-02 23:01:43,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:43,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 75 transitions. [2021-05-02 23:01:43,580 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 75 transitions. Word has length 51 [2021-05-02 23:01:43,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:43,580 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 75 transitions. [2021-05-02 23:01:43,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,580 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 75 transitions. [2021-05-02 23:01:43,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:01:43,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:43,581 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:43,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:01:43,581 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:43,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:43,581 INFO L82 PathProgramCache]: Analyzing trace with hash -862659328, now seen corresponding path program 9 times [2021-05-02 23:01:43,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:43,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730342589] [2021-05-02 23:01:43,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:43,585 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:43,586 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:43,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:43,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:43,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:43,674 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:43,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730342589] [2021-05-02 23:01:43,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [730342589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:43,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:43,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:43,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480132791] [2021-05-02 23:01:43,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:43,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:43,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:43,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:43,677 INFO L87 Difference]: Start difference. First operand 62 states and 75 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 7 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,015 INFO L93 Difference]: Finished difference Result 89 states and 109 transitions. [2021-05-02 23:01:44,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:01:44,015 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 7 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-02 23:01:44,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,016 INFO L225 Difference]: With dead ends: 89 [2021-05-02 23:01:44,016 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 23:01:44,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 253.2ms TimeCoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:01:44,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 23:01:44,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2021-05-02 23:01:44,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 55 states have (on average 1.2545454545454546) internal successors, (69), 55 states have internal predecessors, (69), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-02 23:01:44,037 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 55 [2021-05-02 23:01:44,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,037 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-02 23:01:44,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 7 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,038 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-02 23:01:44,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 23:01:44,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,038 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:01:44,038 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,039 INFO L82 PathProgramCache]: Analyzing trace with hash -804107836, now seen corresponding path program 10 times [2021-05-02 23:01:44,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134008806] [2021-05-02 23:01:44,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,042 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,043 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:44,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:44,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:44,140 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:44,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134008806] [2021-05-02 23:01:44,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [134008806] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:44,140 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:44,140 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:44,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703671453] [2021-05-02 23:01:44,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:44,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:44,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:44,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:44,141 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,567 INFO L93 Difference]: Finished difference Result 92 states and 113 transitions. [2021-05-02 23:01:44,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:01:44,567 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-02 23:01:44,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,568 INFO L225 Difference]: With dead ends: 92 [2021-05-02 23:01:44,568 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 23:01:44,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 334.1ms TimeCoverageRelationStatistics Valid=167, Invalid=433, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:01:44,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 23:01:44,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2021-05-02 23:01:44,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 58 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-05-02 23:01:44,576 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 58 [2021-05-02 23:01:44,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,576 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-05-02 23:01:44,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,576 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-05-02 23:01:44,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 23:01:44,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,577 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:01:44,577 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,577 INFO L82 PathProgramCache]: Analyzing trace with hash -253331840, now seen corresponding path program 11 times [2021-05-02 23:01:44,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208496748] [2021-05-02 23:01:44,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,580 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,581 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:44,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:44,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:44,663 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:44,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208496748] [2021-05-02 23:01:44,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1208496748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:44,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:44,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:44,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544561047] [2021-05-02 23:01:44,664 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:44,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:44,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:44,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:44,664 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,959 INFO L93 Difference]: Finished difference Result 90 states and 109 transitions. [2021-05-02 23:01:44,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:01:44,959 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-02 23:01:44,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,960 INFO L225 Difference]: With dead ends: 90 [2021-05-02 23:01:44,960 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 23:01:44,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 211.8ms TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:01:44,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 23:01:44,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 72. [2021-05-02 23:01:44,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 64 states have (on average 1.265625) internal successors, (81), 64 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2021-05-02 23:01:44,968 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 61 [2021-05-02 23:01:44,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,969 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2021-05-02 23:01:44,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:44,969 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2021-05-02 23:01:44,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 23:01:44,969 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,969 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:01:44,969 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1836788888, now seen corresponding path program 12 times [2021-05-02 23:01:44,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225496693] [2021-05-02 23:01:44,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,972 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,973 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:45,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:45,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:45,055 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:45,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225496693] [2021-05-02 23:01:45,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225496693] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:45,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:45,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:45,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929307755] [2021-05-02 23:01:45,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:45,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:45,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:45,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:45,056 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 11 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:45,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:45,481 INFO L93 Difference]: Finished difference Result 99 states and 122 transitions. [2021-05-02 23:01:45,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:01:45,482 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 65 [2021-05-02 23:01:45,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:45,482 INFO L225 Difference]: With dead ends: 99 [2021-05-02 23:01:45,482 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 23:01:45,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 335.7ms TimeCoverageRelationStatistics Valid=153, Invalid=399, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:01:45,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 23:01:45,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-05-02 23:01:45,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 65 states have internal predecessors, (82), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:45,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2021-05-02 23:01:45,491 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 65 [2021-05-02 23:01:45,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:45,491 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2021-05-02 23:01:45,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 3.9) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:45,492 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2021-05-02 23:01:45,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 23:01:45,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:45,492 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:45,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:01:45,492 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:45,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:45,492 INFO L82 PathProgramCache]: Analyzing trace with hash -509955284, now seen corresponding path program 13 times [2021-05-02 23:01:45,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:45,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847580680] [2021-05-02 23:01:45,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:45,501 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:45,502 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:45,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:45,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:45,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:45,586 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:45,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847580680] [2021-05-02 23:01:45,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1847580680] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:45,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:45,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:45,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32159682] [2021-05-02 23:01:45,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:45,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:45,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:45,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:45,587 INFO L87 Difference]: Start difference. First operand 73 states and 89 transitions. Second operand has 11 states, 10 states have (on average 4.2) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:45,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:45,933 INFO L93 Difference]: Finished difference Result 97 states and 118 transitions. [2021-05-02 23:01:45,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:01:45,934 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.2) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 68 [2021-05-02 23:01:45,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:45,934 INFO L225 Difference]: With dead ends: 97 [2021-05-02 23:01:45,934 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:01:45,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 245.0ms TimeCoverageRelationStatistics Valid=118, Invalid=302, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:01:45,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:01:45,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-05-02 23:01:45,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 71 states have (on average 1.267605633802817) internal successors, (90), 71 states have internal predecessors, (90), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:45,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 97 transitions. [2021-05-02 23:01:45,945 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 97 transitions. Word has length 68 [2021-05-02 23:01:45,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:45,945 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 97 transitions. [2021-05-02 23:01:45,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 4.2) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:45,945 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 97 transitions. [2021-05-02 23:01:45,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 23:01:45,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:45,946 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:45,946 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:01:45,946 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:45,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:45,946 INFO L82 PathProgramCache]: Analyzing trace with hash 992555844, now seen corresponding path program 14 times [2021-05-02 23:01:45,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:45,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490442248] [2021-05-02 23:01:45,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:45,951 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:45,952 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:45,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:45,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:01:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:46,005 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:46,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490442248] [2021-05-02 23:01:46,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [490442248] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:46,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:46,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:01:46,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614945918] [2021-05-02 23:01:46,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:01:46,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:46,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:01:46,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:01:46,006 INFO L87 Difference]: Start difference. First operand 79 states and 97 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,108 INFO L93 Difference]: Finished difference Result 150 states and 186 transitions. [2021-05-02 23:01:46,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:46,109 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-02 23:01:46,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,109 INFO L225 Difference]: With dead ends: 150 [2021-05-02 23:01:46,109 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 23:01:46,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:46,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 23:01:46,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 23:01:46,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 73 states have (on average 1.2602739726027397) internal successors, (92), 73 states have internal predecessors, (92), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 99 transitions. [2021-05-02 23:01:46,120 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 99 transitions. Word has length 72 [2021-05-02 23:01:46,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,120 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 99 transitions. [2021-05-02 23:01:46,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,120 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 99 transitions. [2021-05-02 23:01:46,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 23:01:46,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,121 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:01:46,121 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1493400922, now seen corresponding path program 15 times [2021-05-02 23:01:46,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795042112] [2021-05-02 23:01:46,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,124 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,125 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:46,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-02 23:01:46,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:46,184 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:46,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795042112] [2021-05-02 23:01:46,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [795042112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:46,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:46,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:46,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233936995] [2021-05-02 23:01:46,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:46,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:46,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:46,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:46,185 INFO L87 Difference]: Start difference. First operand 81 states and 99 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,312 INFO L93 Difference]: Finished difference Result 152 states and 188 transitions. [2021-05-02 23:01:46,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:01:46,312 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-02 23:01:46,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,313 INFO L225 Difference]: With dead ends: 152 [2021-05-02 23:01:46,313 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:01:46,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 53.0ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:46,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:01:46,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 23:01:46,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 75 states have (on average 1.2533333333333334) internal successors, (94), 75 states have internal predecessors, (94), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 101 transitions. [2021-05-02 23:01:46,326 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 101 transitions. Word has length 74 [2021-05-02 23:01:46,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,326 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 101 transitions. [2021-05-02 23:01:46,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,326 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 101 transitions. [2021-05-02 23:01:46,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 23:01:46,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,327 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:01:46,327 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1798930824, now seen corresponding path program 16 times [2021-05-02 23:01:46,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959405450] [2021-05-02 23:01:46,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,331 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,332 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:46,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 23:01:46,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:46,395 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:46,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959405450] [2021-05-02 23:01:46,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [959405450] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:46,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:46,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:46,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931478049] [2021-05-02 23:01:46,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:01:46,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:46,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:01:46,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:46,397 INFO L87 Difference]: Start difference. First operand 83 states and 101 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,561 INFO L93 Difference]: Finished difference Result 169 states and 209 transitions. [2021-05-02 23:01:46,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:01:46,561 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2021-05-02 23:01:46,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,562 INFO L225 Difference]: With dead ends: 169 [2021-05-02 23:01:46,562 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 23:01:46,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 54.9ms TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:46,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 23:01:46,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2021-05-02 23:01:46,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 77 states have (on average 1.2467532467532467) internal successors, (96), 77 states have internal predecessors, (96), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 103 transitions. [2021-05-02 23:01:46,573 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 103 transitions. Word has length 76 [2021-05-02 23:01:46,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,573 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 103 transitions. [2021-05-02 23:01:46,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:46,573 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 103 transitions. [2021-05-02 23:01:46,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:01:46,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,574 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:01:46,574 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,574 INFO L82 PathProgramCache]: Analyzing trace with hash 338841578, now seen corresponding path program 17 times [2021-05-02 23:01:46,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543163259] [2021-05-02 23:01:46,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,577 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,578 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:46,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:01:46,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,091 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:47,092 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:47,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543163259] [2021-05-02 23:01:47,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [543163259] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:47,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:47,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:01:47,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691888211] [2021-05-02 23:01:47,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:01:47,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:47,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:01:47,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:01:47,093 INFO L87 Difference]: Start difference. First operand 85 states and 103 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:48,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:48,278 INFO L93 Difference]: Finished difference Result 148 states and 182 transitions. [2021-05-02 23:01:48,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:01:48,279 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 78 [2021-05-02 23:01:48,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:48,279 INFO L225 Difference]: With dead ends: 148 [2021-05-02 23:01:48,279 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 23:01:48,280 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 7 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1132.6ms TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:01:48,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 23:01:48,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-02 23:01:48,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 83 states have (on average 1.2409638554216869) internal successors, (103), 83 states have internal predecessors, (103), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:48,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 110 transitions. [2021-05-02 23:01:48,299 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 110 transitions. Word has length 78 [2021-05-02 23:01:48,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:48,300 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 110 transitions. [2021-05-02 23:01:48,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:48,300 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 110 transitions. [2021-05-02 23:01:48,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:01:48,300 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:48,301 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:48,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:01:48,301 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:48,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:48,301 INFO L82 PathProgramCache]: Analyzing trace with hash -2016963672, now seen corresponding path program 1 times [2021-05-02 23:01:48,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:48,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47071661] [2021-05-02 23:01:48,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:48,305 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:48,306 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:48,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:48,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:48,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:48,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:01:48,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:49,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:49,029 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:49,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47071661] [2021-05-02 23:01:49,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [47071661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:49,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:49,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:01:49,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977515031] [2021-05-02 23:01:49,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:01:49,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:49,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:01:49,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=563, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:01:49,030 INFO L87 Difference]: Start difference. First operand 91 states and 110 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:51,326 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 93 [2021-05-02 23:01:52,170 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 94 [2021-05-02 23:01:53,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:53,536 INFO L93 Difference]: Finished difference Result 388 states and 513 transitions. [2021-05-02 23:01:53,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 23:01:53,537 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 78 [2021-05-02 23:01:53,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:53,538 INFO L225 Difference]: With dead ends: 388 [2021-05-02 23:01:53,538 INFO L226 Difference]: Without dead ends: 342 [2021-05-02 23:01:53,540 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1833 ImplicationChecksByTransitivity, 4054.1ms TimeCoverageRelationStatistics Valid=1048, Invalid=5924, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 23:01:53,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-05-02 23:01:53,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 230. [2021-05-02 23:01:53,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 222 states have (on average 1.3693693693693694) internal successors, (304), 222 states have internal predecessors, (304), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:53,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 311 transitions. [2021-05-02 23:01:53,591 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 311 transitions. Word has length 78 [2021-05-02 23:01:53,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:53,592 INFO L480 AbstractCegarLoop]: Abstraction has 230 states and 311 transitions. [2021-05-02 23:01:53,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 24 states have internal predecessors, (45), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:53,592 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 311 transitions. [2021-05-02 23:01:53,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:01:53,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:53,592 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 5, 5, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:53,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:01:53,593 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:53,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:53,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1248644326, now seen corresponding path program 2 times [2021-05-02 23:01:53,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:53,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94387820] [2021-05-02 23:01:53,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:53,596 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:53,596 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:53,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:53,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:01:53,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:53,817 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:53,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94387820] [2021-05-02 23:01:53,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [94387820] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:53,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:53,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:01:53,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736481671] [2021-05-02 23:01:53,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:01:53,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:53,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:01:53,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:01:53,818 INFO L87 Difference]: Start difference. First operand 230 states and 311 transitions. Second operand has 18 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:54,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:54,484 INFO L93 Difference]: Finished difference Result 253 states and 337 transitions. [2021-05-02 23:01:54,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:01:54,484 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 78 [2021-05-02 23:01:54,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:54,485 INFO L225 Difference]: With dead ends: 253 [2021-05-02 23:01:54,485 INFO L226 Difference]: Without dead ends: 251 [2021-05-02 23:01:54,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 483.5ms TimeCoverageRelationStatistics Valid=281, Invalid=1201, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:01:54,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-05-02 23:01:54,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 236. [2021-05-02 23:01:54,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 226 states have (on average 1.3628318584070795) internal successors, (308), 227 states have internal predecessors, (308), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:01:54,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 317 transitions. [2021-05-02 23:01:54,537 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 317 transitions. Word has length 78 [2021-05-02 23:01:54,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:54,538 INFO L480 AbstractCegarLoop]: Abstraction has 236 states and 317 transitions. [2021-05-02 23:01:54,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:54,538 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 317 transitions. [2021-05-02 23:01:54,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:01:54,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:54,538 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:54,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:01:54,539 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:54,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:54,539 INFO L82 PathProgramCache]: Analyzing trace with hash 479012826, now seen corresponding path program 1 times [2021-05-02 23:01:54,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:54,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260362268] [2021-05-02 23:01:54,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:54,542 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:54,543 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:54,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:54,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:54,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:54,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:01:54,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:55,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:01:55,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:55,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:55,332 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:55,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260362268] [2021-05-02 23:01:55,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1260362268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:55,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:55,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:01:55,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052959178] [2021-05-02 23:01:55,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:01:55,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:55,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:01:55,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:01:55,334 INFO L87 Difference]: Start difference. First operand 236 states and 317 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:56,509 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 88 [2021-05-02 23:01:58,724 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 81 [2021-05-02 23:02:00,557 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 85 [2021-05-02 23:02:00,838 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 84 [2021-05-02 23:02:01,760 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 88 [2021-05-02 23:02:02,638 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 85 [2021-05-02 23:02:02,906 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 84 [2021-05-02 23:02:03,177 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 81 [2021-05-02 23:02:03,429 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 78 [2021-05-02 23:02:04,006 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 82 [2021-05-02 23:02:05,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:05,567 INFO L93 Difference]: Finished difference Result 965 states and 1315 transitions. [2021-05-02 23:02:05,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-02 23:02:05,568 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:05,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:05,570 INFO L225 Difference]: With dead ends: 965 [2021-05-02 23:02:05,571 INFO L226 Difference]: Without dead ends: 842 [2021-05-02 23:02:05,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5175 ImplicationChecksByTransitivity, 9035.6ms TimeCoverageRelationStatistics Valid=2687, Invalid=13825, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 23:02:05,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-05-02 23:02:05,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 460. [2021-05-02 23:02:05,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 450 states have (on average 1.4133333333333333) internal successors, (636), 451 states have internal predecessors, (636), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:05,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 645 transitions. [2021-05-02 23:02:05,700 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 645 transitions. Word has length 86 [2021-05-02 23:02:05,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:05,700 INFO L480 AbstractCegarLoop]: Abstraction has 460 states and 645 transitions. [2021-05-02 23:02:05,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:05,700 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 645 transitions. [2021-05-02 23:02:05,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:05,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:05,701 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:05,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:02:05,701 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:05,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:05,701 INFO L82 PathProgramCache]: Analyzing trace with hash 84646040, now seen corresponding path program 2 times [2021-05-02 23:02:05,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:05,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892091272] [2021-05-02 23:02:05,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:05,704 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:05,705 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:05,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:05,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:05,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:05,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:05,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:06,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:06,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:06,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:06,059 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:06,059 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892091272] [2021-05-02 23:02:06,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [892091272] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:06,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:06,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:02:06,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484659004] [2021-05-02 23:02:06,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:02:06,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:06,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:02:06,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:02:06,060 INFO L87 Difference]: Start difference. First operand 460 states and 645 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:06,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:06,790 INFO L93 Difference]: Finished difference Result 807 states and 1149 transitions. [2021-05-02 23:02:06,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:02:06,790 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:06,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:06,792 INFO L225 Difference]: With dead ends: 807 [2021-05-02 23:02:06,793 INFO L226 Difference]: Without dead ends: 424 [2021-05-02 23:02:06,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 633.0ms TimeCoverageRelationStatistics Valid=128, Invalid=574, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:02:06,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-05-02 23:02:06,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 423. [2021-05-02 23:02:06,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 413 states have (on average 1.430992736077482) internal successors, (591), 414 states have internal predecessors, (591), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:06,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 600 transitions. [2021-05-02 23:02:06,902 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 600 transitions. Word has length 86 [2021-05-02 23:02:06,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:06,902 INFO L480 AbstractCegarLoop]: Abstraction has 423 states and 600 transitions. [2021-05-02 23:02:06,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:06,903 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 600 transitions. [2021-05-02 23:02:06,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:06,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:06,903 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 5, 5, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:06,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:02:06,904 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:06,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:06,904 INFO L82 PathProgramCache]: Analyzing trace with hash -810662372, now seen corresponding path program 3 times [2021-05-02 23:02:06,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:06,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121041675] [2021-05-02 23:02:06,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:06,908 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:06,909 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:06,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:07,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:07,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:07,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:07,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:07,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:07,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:07,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:07,554 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:07,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121041675] [2021-05-02 23:02:07,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1121041675] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:07,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:07,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:02:07,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747702368] [2021-05-02 23:02:07,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:02:07,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:07,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:02:07,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:02:07,555 INFO L87 Difference]: Start difference. First operand 423 states and 600 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:08,996 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 91 [2021-05-02 23:02:09,825 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 84 [2021-05-02 23:02:11,377 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 84 [2021-05-02 23:02:11,509 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 87 [2021-05-02 23:02:12,869 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 82 [2021-05-02 23:02:13,161 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 82 [2021-05-02 23:02:13,344 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 75 [2021-05-02 23:02:13,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:13,764 INFO L93 Difference]: Finished difference Result 1400 states and 1971 transitions. [2021-05-02 23:02:13,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 23:02:13,765 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:13,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:13,768 INFO L225 Difference]: With dead ends: 1400 [2021-05-02 23:02:13,768 INFO L226 Difference]: Without dead ends: 1078 [2021-05-02 23:02:13,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2664 ImplicationChecksByTransitivity, 5573.9ms TimeCoverageRelationStatistics Valid=1497, Invalid=7433, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 23:02:13,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1078 states. [2021-05-02 23:02:14,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1078 to 781. [2021-05-02 23:02:14,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 781 states, 771 states have (on average 1.4280155642023347) internal successors, (1101), 772 states have internal predecessors, (1101), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:14,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 781 states to 781 states and 1110 transitions. [2021-05-02 23:02:14,024 INFO L78 Accepts]: Start accepts. Automaton has 781 states and 1110 transitions. Word has length 86 [2021-05-02 23:02:14,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:14,024 INFO L480 AbstractCegarLoop]: Abstraction has 781 states and 1110 transitions. [2021-05-02 23:02:14,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:14,024 INFO L276 IsEmpty]: Start isEmpty. Operand 781 states and 1110 transitions. [2021-05-02 23:02:14,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:14,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:14,025 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:14,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:02:14,026 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:14,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:14,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1708055650, now seen corresponding path program 4 times [2021-05-02 23:02:14,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:14,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698656162] [2021-05-02 23:02:14,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:14,029 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:14,030 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:14,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:14,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:14,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:14,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:14,501 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:14,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698656162] [2021-05-02 23:02:14,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [698656162] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:14,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:14,501 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:02:14,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263365800] [2021-05-02 23:02:14,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:02:14,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:14,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:02:14,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:02:14,502 INFO L87 Difference]: Start difference. First operand 781 states and 1110 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 21 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:18,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:18,054 INFO L93 Difference]: Finished difference Result 2158 states and 3052 transitions. [2021-05-02 23:02:18,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 23:02:18,055 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 21 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:18,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:18,059 INFO L225 Difference]: With dead ends: 2158 [2021-05-02 23:02:18,059 INFO L226 Difference]: Without dead ends: 1528 [2021-05-02 23:02:18,061 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1443 ImplicationChecksByTransitivity, 2834.6ms TimeCoverageRelationStatistics Valid=984, Invalid=4128, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 23:02:18,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1528 states. [2021-05-02 23:02:18,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1528 to 1070. [2021-05-02 23:02:18,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1070 states, 1060 states have (on average 1.4235849056603773) internal successors, (1509), 1061 states have internal predecessors, (1509), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:18,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1070 states to 1070 states and 1518 transitions. [2021-05-02 23:02:18,482 INFO L78 Accepts]: Start accepts. Automaton has 1070 states and 1518 transitions. Word has length 86 [2021-05-02 23:02:18,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:18,482 INFO L480 AbstractCegarLoop]: Abstraction has 1070 states and 1518 transitions. [2021-05-02 23:02:18,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 21 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:18,483 INFO L276 IsEmpty]: Start isEmpty. Operand 1070 states and 1518 transitions. [2021-05-02 23:02:18,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:18,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:18,484 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:18,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:02:18,484 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:18,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:18,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1723574368, now seen corresponding path program 5 times [2021-05-02 23:02:18,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:18,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651843723] [2021-05-02 23:02:18,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:18,488 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:18,489 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:18,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:18,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:18,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:18,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:18,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:19,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:19,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:19,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:19,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:19,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651843723] [2021-05-02 23:02:19,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [651843723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:19,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:19,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:02:19,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396588812] [2021-05-02 23:02:19,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:02:19,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:19,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:02:19,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:02:19,518 INFO L87 Difference]: Start difference. First operand 1070 states and 1518 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:20,981 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 69 [2021-05-02 23:02:21,355 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 71 [2021-05-02 23:02:21,493 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 75 [2021-05-02 23:02:21,616 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 71 [2021-05-02 23:02:21,798 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 70 [2021-05-02 23:02:22,170 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 54 [2021-05-02 23:02:22,915 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 69 [2021-05-02 23:02:26,240 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2021-05-02 23:02:27,762 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 75 [2021-05-02 23:02:29,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:29,166 INFO L93 Difference]: Finished difference Result 1730 states and 2416 transitions. [2021-05-02 23:02:29,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-02 23:02:29,167 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:29,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:29,171 INFO L225 Difference]: With dead ends: 1730 [2021-05-02 23:02:29,171 INFO L226 Difference]: Without dead ends: 1685 [2021-05-02 23:02:29,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4558 ImplicationChecksByTransitivity, 8597.2ms TimeCoverageRelationStatistics Valid=2071, Invalid=12935, Unknown=0, NotChecked=0, Total=15006 [2021-05-02 23:02:29,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1685 states. [2021-05-02 23:02:29,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1685 to 967. [2021-05-02 23:02:29,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 967 states, 957 states have (on average 1.3584117032392895) internal successors, (1300), 958 states have internal predecessors, (1300), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:29,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 967 states to 967 states and 1309 transitions. [2021-05-02 23:02:29,551 INFO L78 Accepts]: Start accepts. Automaton has 967 states and 1309 transitions. Word has length 86 [2021-05-02 23:02:29,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:29,551 INFO L480 AbstractCegarLoop]: Abstraction has 967 states and 1309 transitions. [2021-05-02 23:02:29,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:29,551 INFO L276 IsEmpty]: Start isEmpty. Operand 967 states and 1309 transitions. [2021-05-02 23:02:29,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:29,553 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:29,553 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:29,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:02:29,553 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:29,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:29,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1661534754, now seen corresponding path program 6 times [2021-05-02 23:02:29,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:29,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153390266] [2021-05-02 23:02:29,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:29,556 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:29,557 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:29,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:29,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:29,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:29,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:29,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:30,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:30,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:30,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:30,752 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:30,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153390266] [2021-05-02 23:02:30,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1153390266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:30,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:30,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:02:30,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282158416] [2021-05-02 23:02:30,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:02:30,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:30,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:02:30,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:02:30,753 INFO L87 Difference]: Start difference. First operand 967 states and 1309 transitions. Second operand has 35 states, 35 states have (on average 1.8) internal successors, (63), 33 states have internal predecessors, (63), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:32,847 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 108 [2021-05-02 23:02:36,159 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 91 [2021-05-02 23:02:36,552 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 88 [2021-05-02 23:02:36,705 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 81 [2021-05-02 23:02:37,513 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 95 [2021-05-02 23:02:38,619 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 80 [2021-05-02 23:02:40,293 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 86 [2021-05-02 23:02:40,480 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 84 [2021-05-02 23:02:40,787 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 78 [2021-05-02 23:02:42,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:42,473 INFO L93 Difference]: Finished difference Result 2040 states and 2738 transitions. [2021-05-02 23:02:42,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-02 23:02:42,474 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8) internal successors, (63), 33 states have internal predecessors, (63), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:42,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:42,479 INFO L225 Difference]: With dead ends: 2040 [2021-05-02 23:02:42,479 INFO L226 Difference]: Without dead ends: 1950 [2021-05-02 23:02:42,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6281 ImplicationChecksByTransitivity, 10346.4ms TimeCoverageRelationStatistics Valid=2473, Invalid=17267, Unknown=0, NotChecked=0, Total=19740 [2021-05-02 23:02:42,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1950 states. [2021-05-02 23:02:43,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1950 to 1447. [2021-05-02 23:02:43,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1447 states, 1437 states have (on average 1.3674321503131524) internal successors, (1965), 1438 states have internal predecessors, (1965), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:43,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1447 states to 1447 states and 1974 transitions. [2021-05-02 23:02:43,062 INFO L78 Accepts]: Start accepts. Automaton has 1447 states and 1974 transitions. Word has length 86 [2021-05-02 23:02:43,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:43,062 INFO L480 AbstractCegarLoop]: Abstraction has 1447 states and 1974 transitions. [2021-05-02 23:02:43,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.8) internal successors, (63), 33 states have internal predecessors, (63), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:43,062 INFO L276 IsEmpty]: Start isEmpty. Operand 1447 states and 1974 transitions. [2021-05-02 23:02:43,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:02:43,064 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:43,064 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:43,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:02:43,065 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:43,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:43,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1795960926, now seen corresponding path program 7 times [2021-05-02 23:02:43,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:43,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654641405] [2021-05-02 23:02:43,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:43,068 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:43,074 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:43,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:43,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:43,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:43,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:43,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:43,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:43,504 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:43,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654641405] [2021-05-02 23:02:43,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1654641405] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:43,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:43,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:02:43,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43419210] [2021-05-02 23:02:43,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:02:43,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:43,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:02:43,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:02:43,505 INFO L87 Difference]: Start difference. First operand 1447 states and 1974 transitions. Second operand has 20 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 17 states have internal predecessors, (44), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:45,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:45,015 INFO L93 Difference]: Finished difference Result 1472 states and 2002 transitions. [2021-05-02 23:02:45,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:02:45,016 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 17 states have internal predecessors, (44), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 86 [2021-05-02 23:02:45,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:45,020 INFO L225 Difference]: With dead ends: 1472 [2021-05-02 23:02:45,020 INFO L226 Difference]: Without dead ends: 1470 [2021-05-02 23:02:45,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 832.5ms TimeCoverageRelationStatistics Valid=207, Invalid=1275, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:02:45,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1470 states. [2021-05-02 23:02:45,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1470 to 1455. [2021-05-02 23:02:45,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1455 states, 1443 states have (on average 1.365904365904366) internal successors, (1971), 1444 states have internal predecessors, (1971), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:02:45,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1455 states to 1455 states and 1982 transitions. [2021-05-02 23:02:45,601 INFO L78 Accepts]: Start accepts. Automaton has 1455 states and 1982 transitions. Word has length 86 [2021-05-02 23:02:45,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:45,602 INFO L480 AbstractCegarLoop]: Abstraction has 1455 states and 1982 transitions. [2021-05-02 23:02:45,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 17 states have internal predecessors, (44), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:45,602 INFO L276 IsEmpty]: Start isEmpty. Operand 1455 states and 1982 transitions. [2021-05-02 23:02:45,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:02:45,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:45,604 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:45,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:02:45,604 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:45,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:45,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1530113686, now seen corresponding path program 8 times [2021-05-02 23:02:45,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:45,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846909420] [2021-05-02 23:02:45,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:45,615 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:45,617 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:45,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:45,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:45,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:45,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:45,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:46,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:46,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:46,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:02:46,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:46,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:46,049 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:46,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846909420] [2021-05-02 23:02:46,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1846909420] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:46,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:46,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:02:46,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561285550] [2021-05-02 23:02:46,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:02:46,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:46,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:02:46,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:02:46,050 INFO L87 Difference]: Start difference. First operand 1455 states and 1982 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:47,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:47,627 INFO L93 Difference]: Finished difference Result 2668 states and 3646 transitions. [2021-05-02 23:02:47,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:02:47,627 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 94 [2021-05-02 23:02:47,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:47,630 INFO L225 Difference]: With dead ends: 2668 [2021-05-02 23:02:47,630 INFO L226 Difference]: Without dead ends: 1434 [2021-05-02 23:02:47,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1027.3ms TimeCoverageRelationStatistics Valid=153, Invalid=717, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:02:47,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1434 states. [2021-05-02 23:02:48,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1434 to 1434. [2021-05-02 23:02:48,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1434 states, 1422 states have (on average 1.3677918424753868) internal successors, (1945), 1423 states have internal predecessors, (1945), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:02:48,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1434 states to 1434 states and 1956 transitions. [2021-05-02 23:02:48,202 INFO L78 Accepts]: Start accepts. Automaton has 1434 states and 1956 transitions. Word has length 94 [2021-05-02 23:02:48,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:48,202 INFO L480 AbstractCegarLoop]: Abstraction has 1434 states and 1956 transitions. [2021-05-02 23:02:48,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:48,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1434 states and 1956 transitions. [2021-05-02 23:02:48,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:02:48,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:48,204 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:48,204 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:02:48,204 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:48,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:48,205 INFO L82 PathProgramCache]: Analyzing trace with hash -325083950, now seen corresponding path program 9 times [2021-05-02 23:02:48,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:48,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411628619] [2021-05-02 23:02:48,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:48,215 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:48,216 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:48,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:48,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:48,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:48,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:48,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:49,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:49,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:49,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:02:49,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:49,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:49,243 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:49,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411628619] [2021-05-02 23:02:49,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1411628619] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:49,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:49,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:02:49,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642135795] [2021-05-02 23:02:49,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:02:49,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:49,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:02:49,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:02:49,244 INFO L87 Difference]: Start difference. First operand 1434 states and 1956 transitions. Second operand has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:55,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:55,544 INFO L93 Difference]: Finished difference Result 1922 states and 2542 transitions. [2021-05-02 23:02:55,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 23:02:55,544 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 94 [2021-05-02 23:02:55,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:55,548 INFO L225 Difference]: With dead ends: 1922 [2021-05-02 23:02:55,548 INFO L226 Difference]: Without dead ends: 1689 [2021-05-02 23:02:55,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 12 SyntacticMatches, 5 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2912 ImplicationChecksByTransitivity, 5393.8ms TimeCoverageRelationStatistics Valid=1429, Invalid=8671, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 23:02:55,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1689 states. [2021-05-02 23:02:56,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1689 to 1303. [2021-05-02 23:02:56,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1303 states, 1291 states have (on average 1.372579395817196) internal successors, (1772), 1292 states have internal predecessors, (1772), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:02:56,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 1783 transitions. [2021-05-02 23:02:56,110 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 1783 transitions. Word has length 94 [2021-05-02 23:02:56,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:56,110 INFO L480 AbstractCegarLoop]: Abstraction has 1303 states and 1783 transitions. [2021-05-02 23:02:56,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:56,110 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 1783 transitions. [2021-05-02 23:02:56,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:02:56,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:56,112 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:56,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-02 23:02:56,112 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:56,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:56,113 INFO L82 PathProgramCache]: Analyzing trace with hash 550935056, now seen corresponding path program 10 times [2021-05-02 23:02:56,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:56,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529212552] [2021-05-02 23:02:56,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:56,116 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:56,117 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:56,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:56,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:56,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:56,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:56,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:56,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:56,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:56,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:02:56,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:56,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:56,602 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:56,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529212552] [2021-05-02 23:02:56,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [529212552] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:56,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:56,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:02:56,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092209614] [2021-05-02 23:02:56,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:02:56,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:56,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:02:56,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:02:56,603 INFO L87 Difference]: Start difference. First operand 1303 states and 1783 transitions. Second operand has 21 states, 20 states have (on average 2.35) internal successors, (47), 18 states have internal predecessors, (47), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:58,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:58,170 INFO L93 Difference]: Finished difference Result 1324 states and 1806 transitions. [2021-05-02 23:02:58,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:02:58,171 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 18 states have internal predecessors, (47), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 94 [2021-05-02 23:02:58,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:58,174 INFO L225 Difference]: With dead ends: 1324 [2021-05-02 23:02:58,174 INFO L226 Difference]: Without dead ends: 1322 [2021-05-02 23:02:58,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 931.0ms TimeCoverageRelationStatistics Valid=220, Invalid=1340, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 23:02:58,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2021-05-02 23:02:58,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1311. [2021-05-02 23:02:58,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1311 states, 1297 states have (on average 1.3708558211256747) internal successors, (1778), 1298 states have internal predecessors, (1778), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 23:02:58,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1311 states to 1311 states and 1791 transitions. [2021-05-02 23:02:58,716 INFO L78 Accepts]: Start accepts. Automaton has 1311 states and 1791 transitions. Word has length 94 [2021-05-02 23:02:58,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:58,717 INFO L480 AbstractCegarLoop]: Abstraction has 1311 states and 1791 transitions. [2021-05-02 23:02:58,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 18 states have internal predecessors, (47), 6 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:02:58,717 INFO L276 IsEmpty]: Start isEmpty. Operand 1311 states and 1791 transitions. [2021-05-02 23:02:58,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-02 23:02:58,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:58,719 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:58,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-02 23:02:58,719 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:58,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:58,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1709954300, now seen corresponding path program 11 times [2021-05-02 23:02:58,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:58,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450139963] [2021-05-02 23:02:58,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:58,723 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:58,724 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:58,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:59,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:02:59,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:02:59,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:02:59,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:02:59,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:02:59,234 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:59,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450139963] [2021-05-02 23:02:59,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1450139963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:59,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:59,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:02:59,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213345385] [2021-05-02 23:02:59,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:02:59,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:59,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:02:59,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:02:59,235 INFO L87 Difference]: Start difference. First operand 1311 states and 1791 transitions. Second operand has 21 states, 20 states have (on average 2.45) internal successors, (49), 18 states have internal predecessors, (49), 7 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:03:00,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:00,882 INFO L93 Difference]: Finished difference Result 1328 states and 1809 transitions. [2021-05-02 23:03:00,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 23:03:00,883 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.45) internal successors, (49), 18 states have internal predecessors, (49), 7 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 102 [2021-05-02 23:03:00,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:00,885 INFO L225 Difference]: With dead ends: 1328 [2021-05-02 23:03:00,885 INFO L226 Difference]: Without dead ends: 1326 [2021-05-02 23:03:00,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 1068.8ms TimeCoverageRelationStatistics Valid=257, Invalid=1549, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:03:00,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1326 states. [2021-05-02 23:03:01,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1326 to 1319. [2021-05-02 23:03:01,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1319 states, 1303 states have (on average 1.3691481197237145) internal successors, (1784), 1304 states have internal predecessors, (1784), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:01,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1319 states to 1319 states and 1799 transitions. [2021-05-02 23:03:01,417 INFO L78 Accepts]: Start accepts. Automaton has 1319 states and 1799 transitions. Word has length 102 [2021-05-02 23:03:01,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:01,417 INFO L480 AbstractCegarLoop]: Abstraction has 1319 states and 1799 transitions. [2021-05-02 23:03:01,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.45) internal successors, (49), 18 states have internal predecessors, (49), 7 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:03:01,417 INFO L276 IsEmpty]: Start isEmpty. Operand 1319 states and 1799 transitions. [2021-05-02 23:03:01,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:01,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:01,419 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:01,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-02 23:03:01,419 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:01,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:01,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1442547704, now seen corresponding path program 12 times [2021-05-02 23:03:01,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:01,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347047219] [2021-05-02 23:03:01,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:01,423 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:01,424 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:01,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:01,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:01,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:01,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:01,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:01,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:01,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:01,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:01,882 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:01,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347047219] [2021-05-02 23:03:01,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1347047219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:01,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:01,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:03:01,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425071726] [2021-05-02 23:03:01,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:03:01,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:01,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:03:01,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:03:01,883 INFO L87 Difference]: Start difference. First operand 1319 states and 1799 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:03,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:03,453 INFO L93 Difference]: Finished difference Result 2426 states and 3319 transitions. [2021-05-02 23:03:03,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:03:03,454 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:03,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:03,457 INFO L225 Difference]: With dead ends: 2426 [2021-05-02 23:03:03,457 INFO L226 Difference]: Without dead ends: 1308 [2021-05-02 23:03:03,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1072.3ms TimeCoverageRelationStatistics Valid=161, Invalid=769, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:03:03,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1308 states. [2021-05-02 23:03:03,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1308 to 1304. [2021-05-02 23:03:03,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1304 states, 1288 states have (on average 1.3711180124223603) internal successors, (1766), 1289 states have internal predecessors, (1766), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:04,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1304 states to 1304 states and 1781 transitions. [2021-05-02 23:03:04,001 INFO L78 Accepts]: Start accepts. Automaton has 1304 states and 1781 transitions. Word has length 110 [2021-05-02 23:03:04,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:04,001 INFO L480 AbstractCegarLoop]: Abstraction has 1304 states and 1781 transitions. [2021-05-02 23:03:04,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:04,001 INFO L276 IsEmpty]: Start isEmpty. Operand 1304 states and 1781 transitions. [2021-05-02 23:03:04,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:04,003 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:04,003 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:04,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-02 23:03:04,003 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:04,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:04,003 INFO L82 PathProgramCache]: Analyzing trace with hash 302630006, now seen corresponding path program 13 times [2021-05-02 23:03:04,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:04,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043842261] [2021-05-02 23:03:04,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:04,007 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:04,007 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:04,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:04,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:04,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:04,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:04,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:04,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:04,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:04,987 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:04,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043842261] [2021-05-02 23:03:04,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1043842261] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:04,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:04,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:03:04,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91413478] [2021-05-02 23:03:04,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:03:04,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:04,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:03:04,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=921, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:03:04,988 INFO L87 Difference]: Start difference. First operand 1304 states and 1781 transitions. Second operand has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:10,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:10,703 INFO L93 Difference]: Finished difference Result 2662 states and 3620 transitions. [2021-05-02 23:03:10,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 23:03:10,704 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:10,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:10,709 INFO L225 Difference]: With dead ends: 2662 [2021-05-02 23:03:10,709 INFO L226 Difference]: Without dead ends: 2516 [2021-05-02 23:03:10,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 4407.0ms TimeCoverageRelationStatistics Valid=1141, Invalid=7415, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:03:10,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2516 states. [2021-05-02 23:03:11,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2516 to 1660. [2021-05-02 23:03:11,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1644 states have (on average 1.3509732360097324) internal successors, (2221), 1645 states have internal predecessors, (2221), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:11,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 2236 transitions. [2021-05-02 23:03:11,436 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 2236 transitions. Word has length 110 [2021-05-02 23:03:11,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:11,436 INFO L480 AbstractCegarLoop]: Abstraction has 1660 states and 2236 transitions. [2021-05-02 23:03:11,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:11,436 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 2236 transitions. [2021-05-02 23:03:11,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:11,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:11,438 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:11,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-02 23:03:11,438 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:11,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:11,439 INFO L82 PathProgramCache]: Analyzing trace with hash 2044627514, now seen corresponding path program 14 times [2021-05-02 23:03:11,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:11,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140596943] [2021-05-02 23:03:11,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:11,442 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:11,443 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:11,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:11,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:11,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:11,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:11,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:12,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:12,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:12,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:12,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:12,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:12,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:12,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:12,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:12,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:12,516 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:12,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140596943] [2021-05-02 23:03:12,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2140596943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:12,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:12,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:03:12,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65092513] [2021-05-02 23:03:12,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:03:12,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:12,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:03:12,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:03:12,517 INFO L87 Difference]: Start difference. First operand 1660 states and 2236 transitions. Second operand has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 25 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:13,842 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 72 [2021-05-02 23:03:14,518 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 82 [2021-05-02 23:03:14,672 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 87 [2021-05-02 23:03:14,943 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 91 [2021-05-02 23:03:15,095 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 84 [2021-05-02 23:03:15,754 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 82 [2021-05-02 23:03:15,935 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 86 [2021-05-02 23:03:17,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:17,521 INFO L93 Difference]: Finished difference Result 3374 states and 4545 transitions. [2021-05-02 23:03:17,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 23:03:17,522 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 25 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:17,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:17,526 INFO L225 Difference]: With dead ends: 3374 [2021-05-02 23:03:17,526 INFO L226 Difference]: Without dead ends: 2007 [2021-05-02 23:03:17,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 18 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 3656.1ms TimeCoverageRelationStatistics Valid=439, Invalid=2531, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:03:17,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2007 states. [2021-05-02 23:03:18,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2007 to 1798. [2021-05-02 23:03:18,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1798 states, 1782 states have (on average 1.3468013468013469) internal successors, (2400), 1783 states have internal predecessors, (2400), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:18,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1798 states to 1798 states and 2415 transitions. [2021-05-02 23:03:18,353 INFO L78 Accepts]: Start accepts. Automaton has 1798 states and 2415 transitions. Word has length 110 [2021-05-02 23:03:18,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:18,353 INFO L480 AbstractCegarLoop]: Abstraction has 1798 states and 2415 transitions. [2021-05-02 23:03:18,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 25 states have internal predecessors, (51), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:18,354 INFO L276 IsEmpty]: Start isEmpty. Operand 1798 states and 2415 transitions. [2021-05-02 23:03:18,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:18,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:18,356 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:18,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-02 23:03:18,357 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:18,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:18,357 INFO L82 PathProgramCache]: Analyzing trace with hash -2083879500, now seen corresponding path program 15 times [2021-05-02 23:03:18,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:18,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223820081] [2021-05-02 23:03:18,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:18,362 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:18,362 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:18,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:18,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:18,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:18,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:18,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:19,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:19,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:19,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:19,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:19,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:19,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:19,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:19,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:19,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:19,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223820081] [2021-05-02 23:03:19,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1223820081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:19,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:19,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:03:19,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132960795] [2021-05-02 23:03:19,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:03:19,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:19,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:03:19,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=883, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:03:19,689 INFO L87 Difference]: Start difference. First operand 1798 states and 2415 transitions. Second operand has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:20,618 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 82 [2021-05-02 23:03:21,164 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 71 [2021-05-02 23:03:21,378 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 96 [2021-05-02 23:03:21,690 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 91 [2021-05-02 23:03:21,837 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 83 [2021-05-02 23:03:22,433 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 79 [2021-05-02 23:03:22,583 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 79 [2021-05-02 23:03:23,363 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 90 [2021-05-02 23:03:23,508 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 78 [2021-05-02 23:03:23,683 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 87 [2021-05-02 23:03:24,281 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 84 [2021-05-02 23:03:24,596 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 84 [2021-05-02 23:03:25,671 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 85 [2021-05-02 23:03:27,078 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 69 [2021-05-02 23:03:27,237 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 71 [2021-05-02 23:03:27,692 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 82 [2021-05-02 23:03:28,169 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 82 [2021-05-02 23:03:28,688 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 75 [2021-05-02 23:03:29,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:29,767 INFO L93 Difference]: Finished difference Result 2382 states and 3136 transitions. [2021-05-02 23:03:29,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 23:03:29,768 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:29,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:29,772 INFO L225 Difference]: With dead ends: 2382 [2021-05-02 23:03:29,772 INFO L226 Difference]: Without dead ends: 2153 [2021-05-02 23:03:29,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 20 SyntacticMatches, 5 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 8114.8ms TimeCoverageRelationStatistics Valid=1406, Invalid=7336, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 23:03:29,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2153 states. [2021-05-02 23:03:30,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2153 to 1914. [2021-05-02 23:03:30,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1914 states, 1898 states have (on average 1.3461538461538463) internal successors, (2555), 1899 states have internal predecessors, (2555), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:30,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1914 states to 1914 states and 2570 transitions. [2021-05-02 23:03:30,684 INFO L78 Accepts]: Start accepts. Automaton has 1914 states and 2570 transitions. Word has length 110 [2021-05-02 23:03:30,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:30,684 INFO L480 AbstractCegarLoop]: Abstraction has 1914 states and 2570 transitions. [2021-05-02 23:03:30,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.84375) internal successors, (59), 30 states have internal predecessors, (59), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 1914 states and 2570 transitions. [2021-05-02 23:03:30,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:30,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:30,686 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:30,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-02 23:03:30,687 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:30,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:30,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1400975308, now seen corresponding path program 16 times [2021-05-02 23:03:30,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:30,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852632040] [2021-05-02 23:03:30,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:30,691 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:30,692 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:30,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:30,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:30,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:30,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:30,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:31,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:31,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:31,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:31,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:31,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:31,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:31,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:31,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:31,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:31,854 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:31,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852632040] [2021-05-02 23:03:31,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1852632040] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:31,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:31,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:03:31,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092929884] [2021-05-02 23:03:31,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:03:31,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:31,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:03:31,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=784, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:03:31,855 INFO L87 Difference]: Start difference. First operand 1914 states and 2570 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:03:36,589 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 69 [2021-05-02 23:03:39,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:39,249 INFO L93 Difference]: Finished difference Result 3701 states and 4973 transitions. [2021-05-02 23:03:39,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 23:03:39,249 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 110 [2021-05-02 23:03:39,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:39,256 INFO L225 Difference]: With dead ends: 3701 [2021-05-02 23:03:39,257 INFO L226 Difference]: Without dead ends: 3609 [2021-05-02 23:03:39,258 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2773 ImplicationChecksByTransitivity, 5280.6ms TimeCoverageRelationStatistics Valid=1520, Invalid=7792, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:03:39,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3609 states. [2021-05-02 23:03:40,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3609 to 2173. [2021-05-02 23:03:40,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2173 states, 2157 states have (on average 1.344923504867872) internal successors, (2901), 2158 states have internal predecessors, (2901), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:40,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2173 states to 2173 states and 2916 transitions. [2021-05-02 23:03:40,344 INFO L78 Accepts]: Start accepts. Automaton has 2173 states and 2916 transitions. Word has length 110 [2021-05-02 23:03:40,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:40,344 INFO L480 AbstractCegarLoop]: Abstraction has 2173 states and 2916 transitions. [2021-05-02 23:03:40,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 2 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 23:03:40,345 INFO L276 IsEmpty]: Start isEmpty. Operand 2173 states and 2916 transitions. [2021-05-02 23:03:40,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:40,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:40,347 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:40,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-02 23:03:40,347 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:40,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:40,347 INFO L82 PathProgramCache]: Analyzing trace with hash -140058058, now seen corresponding path program 17 times [2021-05-02 23:03:40,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:40,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121812780] [2021-05-02 23:03:40,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:40,352 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:40,352 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:40,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:40,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:40,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:40,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:40,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:41,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:41,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:41,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:41,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:41,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:41,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:41,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:41,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:41,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:41,667 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:41,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121812780] [2021-05-02 23:03:41,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1121812780] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:41,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:41,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:03:41,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413232939] [2021-05-02 23:03:41,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:03:41,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:41,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:03:41,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:03:41,668 INFO L87 Difference]: Start difference. First operand 2173 states and 2916 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:42,251 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 65 [2021-05-02 23:03:42,796 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 79 [2021-05-02 23:03:42,979 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 75 [2021-05-02 23:03:43,134 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 75 [2021-05-02 23:03:43,426 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 73 [2021-05-02 23:03:43,610 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2021-05-02 23:03:43,892 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 103 [2021-05-02 23:03:44,039 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 76 [2021-05-02 23:03:44,315 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 111 [2021-05-02 23:03:44,688 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 111 [2021-05-02 23:03:44,897 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 103 [2021-05-02 23:03:45,037 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 75 [2021-05-02 23:03:45,280 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 108 [2021-05-02 23:03:45,933 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 103 [2021-05-02 23:03:46,256 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 102 [2021-05-02 23:03:46,434 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 75 [2021-05-02 23:03:46,665 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 94 [2021-05-02 23:03:46,919 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 107 [2021-05-02 23:03:47,190 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 72 [2021-05-02 23:03:47,380 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 78 [2021-05-02 23:03:47,924 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 108 [2021-05-02 23:03:48,087 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 77 [2021-05-02 23:03:48,358 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 97 [2021-05-02 23:03:49,194 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 105 [2021-05-02 23:03:49,380 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 88 [2021-05-02 23:03:49,560 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 87 [2021-05-02 23:03:49,732 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 75 [2021-05-02 23:03:49,906 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 69 [2021-05-02 23:03:50,318 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 87 [2021-05-02 23:03:50,921 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 99 [2021-05-02 23:03:51,154 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 77 [2021-05-02 23:03:51,405 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 110 [2021-05-02 23:03:51,744 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 78 [2021-05-02 23:03:52,326 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 113 [2021-05-02 23:03:52,702 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 72 [2021-05-02 23:03:52,951 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 94 [2021-05-02 23:03:54,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:54,289 INFO L93 Difference]: Finished difference Result 3193 states and 4200 transitions. [2021-05-02 23:03:54,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 23:03:54,290 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:54,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:54,296 INFO L225 Difference]: With dead ends: 3193 [2021-05-02 23:03:54,296 INFO L226 Difference]: Without dead ends: 2766 [2021-05-02 23:03:54,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2505 ImplicationChecksByTransitivity, 10566.5ms TimeCoverageRelationStatistics Valid=1596, Invalid=7334, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 23:03:54,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2766 states. [2021-05-02 23:03:55,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2766 to 2411. [2021-05-02 23:03:55,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2411 states, 2395 states have (on average 1.3453027139874738) internal successors, (3222), 2396 states have internal predecessors, (3222), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:55,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2411 states to 2411 states and 3237 transitions. [2021-05-02 23:03:55,536 INFO L78 Accepts]: Start accepts. Automaton has 2411 states and 3237 transitions. Word has length 110 [2021-05-02 23:03:55,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:55,536 INFO L480 AbstractCegarLoop]: Abstraction has 2411 states and 3237 transitions. [2021-05-02 23:03:55,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:55,536 INFO L276 IsEmpty]: Start isEmpty. Operand 2411 states and 3237 transitions. [2021-05-02 23:03:55,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:55,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:55,539 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:55,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-02 23:03:55,539 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:55,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:55,540 INFO L82 PathProgramCache]: Analyzing trace with hash 994934070, now seen corresponding path program 18 times [2021-05-02 23:03:55,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:55,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641788334] [2021-05-02 23:03:55,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:55,544 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:55,545 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:55,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:55,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:55,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:55,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:55,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:55,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:55,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:55,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:55,896 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:55,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641788334] [2021-05-02 23:03:55,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [641788334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:55,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:55,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 23:03:55,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49192740] [2021-05-02 23:03:55,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 23:03:55,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:55,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 23:03:55,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:03:55,897 INFO L87 Difference]: Start difference. First operand 2411 states and 3237 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 11 states have internal predecessors, (37), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:57,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:03:57,673 INFO L93 Difference]: Finished difference Result 4077 states and 5492 transitions. [2021-05-02 23:03:57,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:03:57,674 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 11 states have internal predecessors, (37), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:03:57,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:03:57,681 INFO L225 Difference]: With dead ends: 4077 [2021-05-02 23:03:57,682 INFO L226 Difference]: Without dead ends: 2251 [2021-05-02 23:03:57,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 641.5ms TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:03:57,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2251 states. [2021-05-02 23:03:58,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2251 to 2251. [2021-05-02 23:03:58,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2251 states, 2235 states have (on average 1.3498881431767338) internal successors, (3017), 2236 states have internal predecessors, (3017), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:03:58,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2251 states to 2251 states and 3032 transitions. [2021-05-02 23:03:58,861 INFO L78 Accepts]: Start accepts. Automaton has 2251 states and 3032 transitions. Word has length 110 [2021-05-02 23:03:58,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:03:58,861 INFO L480 AbstractCegarLoop]: Abstraction has 2251 states and 3032 transitions. [2021-05-02 23:03:58,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 11 states have internal predecessors, (37), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:03:58,861 INFO L276 IsEmpty]: Start isEmpty. Operand 2251 states and 3032 transitions. [2021-05-02 23:03:58,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:03:58,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:03:58,864 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:03:58,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-02 23:03:58,864 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:03:58,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:03:58,864 INFO L82 PathProgramCache]: Analyzing trace with hash 165615032, now seen corresponding path program 19 times [2021-05-02 23:03:58,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:03:58,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375811693] [2021-05-02 23:03:58,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:03:58,868 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:03:58,869 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:03:58,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:58,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:03:58,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:58,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:03:58,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:59,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:03:59,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:59,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:03:59,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:59,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:03:59,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:59,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:03:59,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:03:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:03:59,571 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:03:59,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375811693] [2021-05-02 23:03:59,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1375811693] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:03:59,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:03:59,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:03:59,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145638371] [2021-05-02 23:03:59,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:03:59,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:03:59,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:03:59,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:03:59,572 INFO L87 Difference]: Start difference. First operand 2251 states and 3032 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 22 states have internal predecessors, (51), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:01,176 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 70 [2021-05-02 23:04:01,404 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 83 [2021-05-02 23:04:01,624 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 80 [2021-05-02 23:04:02,034 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 87 [2021-05-02 23:04:02,158 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 75 [2021-05-02 23:04:02,469 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 75 [2021-05-02 23:04:02,718 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 74 [2021-05-02 23:04:03,481 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 68 [2021-05-02 23:04:03,883 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 75 [2021-05-02 23:04:04,674 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 70 [2021-05-02 23:04:05,217 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 63 [2021-05-02 23:04:06,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:06,296 INFO L93 Difference]: Finished difference Result 3389 states and 4466 transitions. [2021-05-02 23:04:06,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 23:04:06,296 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 22 states have internal predecessors, (51), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:04:06,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:06,300 INFO L225 Difference]: With dead ends: 3389 [2021-05-02 23:04:06,300 INFO L226 Difference]: Without dead ends: 2087 [2021-05-02 23:04:06,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1646 ImplicationChecksByTransitivity, 5115.2ms TimeCoverageRelationStatistics Valid=1205, Invalid=4801, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 23:04:06,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2021-05-02 23:04:07,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 1495. [2021-05-02 23:04:07,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1495 states, 1479 states have (on average 1.330628803245436) internal successors, (1968), 1480 states have internal predecessors, (1968), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:04:07,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1495 states to 1495 states and 1983 transitions. [2021-05-02 23:04:07,131 INFO L78 Accepts]: Start accepts. Automaton has 1495 states and 1983 transitions. Word has length 110 [2021-05-02 23:04:07,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:07,131 INFO L480 AbstractCegarLoop]: Abstraction has 1495 states and 1983 transitions. [2021-05-02 23:04:07,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 22 states have internal predecessors, (51), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:07,131 INFO L276 IsEmpty]: Start isEmpty. Operand 1495 states and 1983 transitions. [2021-05-02 23:04:07,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:04:07,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:04:07,133 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:04:07,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-02 23:04:07,133 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:04:07,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:04:07,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1537990282, now seen corresponding path program 20 times [2021-05-02 23:04:07,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:04:07,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490216845] [2021-05-02 23:04:07,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:04:07,138 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:04:07,139 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:04:07,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:07,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:04:07,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:07,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:04:07,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:08,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:04:08,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:08,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:04:08,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:08,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:04:08,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:08,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:04:08,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:08,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:04:08,472 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:04:08,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490216845] [2021-05-02 23:04:08,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [490216845] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:04:08,472 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:04:08,472 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:04:08,472 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89143425] [2021-05-02 23:04:08,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:04:08,472 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:04:08,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:04:08,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=723, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:04:08,473 INFO L87 Difference]: Start difference. First operand 1495 states and 1983 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:10,120 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 70 [2021-05-02 23:04:10,435 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 79 [2021-05-02 23:04:10,738 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 76 [2021-05-02 23:04:10,899 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 69 [2021-05-02 23:04:11,146 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 81 [2021-05-02 23:04:11,315 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 72 [2021-05-02 23:04:11,717 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 75 [2021-05-02 23:04:14,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:14,933 INFO L93 Difference]: Finished difference Result 2439 states and 3239 transitions. [2021-05-02 23:04:14,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 23:04:14,934 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:04:14,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:14,937 INFO L225 Difference]: With dead ends: 2439 [2021-05-02 23:04:14,937 INFO L226 Difference]: Without dead ends: 1585 [2021-05-02 23:04:14,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 4732.6ms TimeCoverageRelationStatistics Valid=487, Invalid=3545, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 23:04:14,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1585 states. [2021-05-02 23:04:15,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1585 to 1502. [2021-05-02 23:04:15,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1486 states have (on average 1.3310901749663526) internal successors, (1978), 1487 states have internal predecessors, (1978), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:04:15,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 1993 transitions. [2021-05-02 23:04:15,774 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 1993 transitions. Word has length 110 [2021-05-02 23:04:15,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:15,774 INFO L480 AbstractCegarLoop]: Abstraction has 1502 states and 1993 transitions. [2021-05-02 23:04:15,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:15,774 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 1993 transitions. [2021-05-02 23:04:15,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:04:15,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:04:15,776 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:04:15,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-02 23:04:15,776 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:04:15,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:04:15,777 INFO L82 PathProgramCache]: Analyzing trace with hash 857919096, now seen corresponding path program 21 times [2021-05-02 23:04:15,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:04:15,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146717240] [2021-05-02 23:04:15,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:04:15,781 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:04:15,781 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:04:15,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:15,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:04:15,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:15,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:04:15,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:16,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:04:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:16,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:04:16,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:16,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:04:16,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:16,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:04:16,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:16,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:04:16,498 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:04:16,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146717240] [2021-05-02 23:04:16,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2146717240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:04:16,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:04:16,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:04:16,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781119157] [2021-05-02 23:04:16,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:04:16,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:04:16,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:04:16,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:04:16,499 INFO L87 Difference]: Start difference. First operand 1502 states and 1993 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:17,084 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 65 [2021-05-02 23:04:17,341 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 68 [2021-05-02 23:04:18,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:18,319 INFO L93 Difference]: Finished difference Result 2703 states and 3601 transitions. [2021-05-02 23:04:18,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:04:18,320 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-05-02 23:04:18,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:18,323 INFO L225 Difference]: With dead ends: 2703 [2021-05-02 23:04:18,323 INFO L226 Difference]: Without dead ends: 1443 [2021-05-02 23:04:18,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1336.0ms TimeCoverageRelationStatistics Valid=128, Invalid=574, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:04:18,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1443 states. [2021-05-02 23:04:19,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1443 to 1443. [2021-05-02 23:04:19,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1443 states, 1427 states have (on average 1.3356692361597757) internal successors, (1906), 1428 states have internal predecessors, (1906), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:04:19,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1443 states to 1443 states and 1921 transitions. [2021-05-02 23:04:19,157 INFO L78 Accepts]: Start accepts. Automaton has 1443 states and 1921 transitions. Word has length 110 [2021-05-02 23:04:19,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:19,157 INFO L480 AbstractCegarLoop]: Abstraction has 1443 states and 1921 transitions. [2021-05-02 23:04:19,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 15 states have internal predecessors, (41), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:04:19,158 INFO L276 IsEmpty]: Start isEmpty. Operand 1443 states and 1921 transitions. [2021-05-02 23:04:19,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:04:19,159 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:04:19,159 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:04:19,159 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-02 23:04:19,159 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:04:19,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:04:19,160 INFO L82 PathProgramCache]: Analyzing trace with hash -650457288, now seen corresponding path program 22 times [2021-05-02 23:04:19,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:04:19,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174796311] [2021-05-02 23:04:19,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:04:19,165 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:04:19,165 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:04:19,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:19,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:04:19,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:19,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:04:19,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:21,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:04:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:21,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:04:21,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:21,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:04:21,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:21,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:04:21,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:21,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:04:21,439 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:04:21,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174796311] [2021-05-02 23:04:21,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [174796311] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:04:21,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:04:21,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-02 23:04:21,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094005216] [2021-05-02 23:04:21,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 23:04:21,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:04:21,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 23:04:21,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1504, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:04:21,440 INFO L87 Difference]: Start difference. First operand 1443 states and 1921 transitions. Second operand has 41 states, 40 states have (on average 1.75) internal successors, (70), 37 states have internal predecessors, (70), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 23:04:23,329 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 67 [2021-05-02 23:04:23,530 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 75 [2021-05-02 23:04:23,703 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 70 [2021-05-02 23:04:23,897 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 74 [2021-05-02 23:04:24,193 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 76 [2021-05-02 23:04:24,371 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 67 [2021-05-02 23:04:24,620 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 76 [2021-05-02 23:04:24,812 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 67 [2021-05-02 23:04:25,039 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 77 [2021-05-02 23:04:25,210 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 64 [2021-05-02 23:04:25,522 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 99 [2021-05-02 23:04:25,726 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 75 [2021-05-02 23:04:26,035 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 96 [2021-05-02 23:04:26,244 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 72 [2021-05-02 23:04:26,507 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 96 [2021-05-02 23:04:26,693 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 72 [2021-05-02 23:04:27,000 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 99 [2021-05-02 23:04:27,319 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 98 [2021-05-02 23:04:27,612 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 96 [2021-05-02 23:04:27,969 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 97 [2021-05-02 23:04:28,238 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2021-05-02 23:04:28,616 WARN L205 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 101 [2021-05-02 23:04:28,955 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 101 [2021-05-02 23:04:29,292 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 94 [2021-05-02 23:04:29,533 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 62 [2021-05-02 23:04:29,852 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 91 [2021-05-02 23:04:30,086 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 76 [2021-05-02 23:04:30,737 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 88 [2021-05-02 23:04:30,988 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 76 [2021-05-02 23:04:31,438 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 97 [2021-05-02 23:04:31,856 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 96 [2021-05-02 23:04:32,330 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 89 [2021-05-02 23:04:33,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:33,230 INFO L93 Difference]: Finished difference Result 3035 states and 4053 transitions. [2021-05-02 23:04:33,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 23:04:33,231 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.75) internal successors, (70), 37 states have internal predecessors, (70), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 110 [2021-05-02 23:04:33,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:33,234 INFO L225 Difference]: With dead ends: 3035 [2021-05-02 23:04:33,234 INFO L226 Difference]: Without dead ends: 1896 [2021-05-02 23:04:33,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2123 ImplicationChecksByTransitivity, 11150.7ms TimeCoverageRelationStatistics Valid=974, Invalid=7582, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:04:33,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1896 states. [2021-05-02 23:04:34,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1896 to 1630. [2021-05-02 23:04:34,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1630 states, 1614 states have (on average 1.3370508054522925) internal successors, (2158), 1615 states have internal predecessors, (2158), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:04:34,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1630 states to 1630 states and 2173 transitions. [2021-05-02 23:04:34,186 INFO L78 Accepts]: Start accepts. Automaton has 1630 states and 2173 transitions. Word has length 110 [2021-05-02 23:04:34,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:34,186 INFO L480 AbstractCegarLoop]: Abstraction has 1630 states and 2173 transitions. [2021-05-02 23:04:34,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.75) internal successors, (70), 37 states have internal predecessors, (70), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 23:04:34,187 INFO L276 IsEmpty]: Start isEmpty. Operand 1630 states and 2173 transitions. [2021-05-02 23:04:34,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 23:04:34,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:04:34,189 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:04:34,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-02 23:04:34,189 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:04:34,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:04:34,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1866611014, now seen corresponding path program 23 times [2021-05-02 23:04:34,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:04:34,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544120740] [2021-05-02 23:04:34,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:04:34,193 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:04:34,194 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:04:34,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:34,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:04:34,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:34,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:04:34,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:35,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:04:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:35,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:04:35,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:35,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:04:35,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:35,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:04:35,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:35,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:04:35,050 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:04:35,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544120740] [2021-05-02 23:04:35,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1544120740] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:04:35,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:04:35,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:04:35,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277602313] [2021-05-02 23:04:35,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:04:35,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:04:35,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:04:35,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:04:35,051 INFO L87 Difference]: Start difference. First operand 1630 states and 2173 transitions. Second operand has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 23:04:37,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:37,805 INFO L93 Difference]: Finished difference Result 1642 states and 2185 transitions. [2021-05-02 23:04:37,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:04:37,807 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 110 [2021-05-02 23:04:37,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:37,809 INFO L225 Difference]: With dead ends: 1642 [2021-05-02 23:04:37,809 INFO L226 Difference]: Without dead ends: 1640 [2021-05-02 23:04:37,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1746.3ms TimeCoverageRelationStatistics Valid=299, Invalid=1593, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 23:04:37,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1640 states. [2021-05-02 23:04:38,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1640 to 1638. [2021-05-02 23:04:38,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1638 states, 1620 states have (on average 1.3358024691358024) internal successors, (2164), 1621 states have internal predecessors, (2164), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 23:04:38,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1638 states to 1638 states and 2181 transitions. [2021-05-02 23:04:38,750 INFO L78 Accepts]: Start accepts. Automaton has 1638 states and 2181 transitions. Word has length 110 [2021-05-02 23:04:38,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:38,751 INFO L480 AbstractCegarLoop]: Abstraction has 1638 states and 2181 transitions. [2021-05-02 23:04:38,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 20 states have internal predecessors, (53), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 23:04:38,751 INFO L276 IsEmpty]: Start isEmpty. Operand 1638 states and 2181 transitions. [2021-05-02 23:04:38,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-02 23:04:38,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:04:38,753 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:04:38,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-02 23:04:38,753 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:04:38,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:04:38,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1803619758, now seen corresponding path program 24 times [2021-05-02 23:04:38,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:04:38,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914205550] [2021-05-02 23:04:38,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:04:38,763 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:04:38,764 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:04:38,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:04:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 23:04:38,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2021-05-02 23:04:38,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 23:04:38,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2021-05-02 23:04:38,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2021-05-02 23:04:38,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-05-02 23:04:38,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:04:38,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:04:38,897 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:04:38,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914205550] [2021-05-02 23:04:38,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1914205550] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:04:38,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:04:38,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:04:38,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677520859] [2021-05-02 23:04:38,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:04:38,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:04:38,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:04:38,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:04:38,898 INFO L87 Difference]: Start difference. First operand 1638 states and 2181 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 8 states have internal predecessors, (40), 7 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 23:04:40,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:04:40,111 INFO L93 Difference]: Finished difference Result 1641 states and 2184 transitions. [2021-05-02 23:04:40,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:04:40,112 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 8 states have internal predecessors, (40), 7 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 118 [2021-05-02 23:04:40,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:04:40,113 INFO L225 Difference]: With dead ends: 1641 [2021-05-02 23:04:40,113 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 23:04:40,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 128.1ms TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:04:40,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 23:04:40,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 23:04:40,115 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) [2021-05-02 23:04:40,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 23:04:40,115 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 118 [2021-05-02 23:04:40,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:04:40,115 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 23:04:40,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 8 states have internal predecessors, (40), 7 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 23:04:40,116 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 23:04:40,116 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 23:04:40,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-02 23:04:40,117 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 23:09:43,694 WARN L205 SmtUtils]: Spent 5.05 m on a formula simplification. DAG size of input: 6112 DAG size of output: 5348 [2021-05-02 23:14:31,212 WARN L205 SmtUtils]: Spent 4.79 m on a formula simplification. DAG size of input: 5854 DAG size of output: 4865 [2021-05-02 23:15:18,632 WARN L205 SmtUtils]: Spent 47.39 s on a formula simplification. DAG size of input: 2284 DAG size of output: 1990