/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:43:33,723 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:43:33,729 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:43:33,782 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 23:43:33,783 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 23:43:33,788 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 23:43:33,793 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 23:43:33,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 23:43:33,804 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 23:43:33,811 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 23:43:33,813 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 23:43:33,816 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 23:43:33,817 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 23:43:33,821 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 23:43:33,824 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 23:43:33,828 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 23:43:33,830 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 23:43:33,837 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 23:43:33,847 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 23:43:33,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 23:43:33,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 23:43:33,864 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 23:43:33,866 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 23:43:33,871 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 23:43:33,884 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 23:43:33,885 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 23:43:33,885 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 23:43:33,887 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 23:43:33,887 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 23:43:33,889 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 23:43:33,889 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 23:43:33,890 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 23:43:33,891 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 23:43:33,892 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 23:43:33,894 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 23:43:33,894 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 23:43:33,896 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 23:43:33,896 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 23:43:33,900 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:43:33,902 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:43:33,904 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:43:33,916 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 23:43:33,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:43:33,947 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:43:33,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:43:33,955 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:43:33,955 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:43:33,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:43:33,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:43:33,956 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:43:33,956 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:43:33,956 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:43:33,958 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:43:33,958 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:43:33,959 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:43:33,959 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:43:33,960 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:43:33,960 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:43:33,960 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:43:33,960 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:43:33,960 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:43:33,961 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:43:33,961 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:43:33,961 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:43:33,961 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:43:33,961 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:43:34,444 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:43:34,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:43:34,477 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:43:34,479 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:43:34,481 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:43:34,482 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.i [2021-05-02 23:43:34,580 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87cce7fda/d892ebeba6624aab9de132bacb7f2a0e/FLAG53e609864 [2021-05-02 23:43:35,209 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:43:35,209 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i [2021-05-02 23:43:35,216 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87cce7fda/d892ebeba6624aab9de132bacb7f2a0e/FLAG53e609864 [2021-05-02 23:43:35,234 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87cce7fda/d892ebeba6624aab9de132bacb7f2a0e [2021-05-02 23:43:35,240 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:43:35,242 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:43:35,246 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:43:35,246 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:43:35,249 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:43:35,250 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,251 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66c09ff5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35, skipping insertion in model container [2021-05-02 23:43:35,251 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,258 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:43:35,275 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:43:35,440 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i[895,908] [2021-05-02 23:43:35,506 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:43:35,513 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:43:35,526 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i[895,908] [2021-05-02 23:43:35,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:43:35,551 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:43:35,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35 WrapperNode [2021-05-02 23:43:35,553 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:43:35,554 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:43:35,554 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:43:35,555 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:43:35,566 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,567 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,574 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,575 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,588 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,594 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,595 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (1/1) ... [2021-05-02 23:43:35,596 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:43:35,597 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:43:35,598 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:43:35,598 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:43:35,599 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (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 23:43:35,666 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:43:35,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:43:35,667 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:43:35,667 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:43:35,667 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:43:35,667 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:43:35,667 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:43:35,668 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:43:35,668 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:43:35,669 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:43:35,669 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:43:35,669 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:43:35,669 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:43:35,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:43:35,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:43:35,670 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:43:35,670 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:43:35,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:43:35,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:43:35,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:43:35,671 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:43:35,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:43:35,909 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:43:35,910 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 23:43:35,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:43:35 BoogieIcfgContainer [2021-05-02 23:43:35,912 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:43:35,914 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:43:35,914 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:43:35,917 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:43:35,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:43:35" (1/3) ... [2021-05-02 23:43:35,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ca518c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:43:35, skipping insertion in model container [2021-05-02 23:43:35,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:43:35" (2/3) ... [2021-05-02 23:43:35,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ca518c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:43:35, skipping insertion in model container [2021-05-02 23:43:35,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:43:35" (3/3) ... [2021-05-02 23:43:35,921 INFO L111 eAbstractionObserver]: Analyzing ICFG jm2006.i [2021-05-02 23:43:35,927 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:43:35,931 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:43:35,948 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:43:35,965 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:43:35,966 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:43:35,966 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:43:35,966 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:43:35,966 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:43:35,966 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:43:35,966 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:43:35,966 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:43:35,979 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:43:35,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 23:43:35,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:35,986 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:35,986 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:35,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:35,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1244516831, now seen corresponding path program 1 times [2021-05-02 23:43:36,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:36,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053883570] [2021-05-02 23:43:36,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:36,129 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:43:36,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:36,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:36,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:36,560 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 23:43:36,562 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:36,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053883570] [2021-05-02 23:43:36,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2053883570] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:36,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:36,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:43:36,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056651618] [2021-05-02 23:43:36,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:43:36,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:36,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:43:36,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:43:36,587 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:37,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:37,116 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-02 23:43:37,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:43:37,120 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 23:43:37,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:37,128 INFO L225 Difference]: With dead ends: 47 [2021-05-02 23:43:37,128 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 23:43:37,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 392.3ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:43:37,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 23:43:37,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 23:43:37,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:37,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-02 23:43:37,171 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2021-05-02 23:43:37,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:37,172 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-02 23:43:37,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:37,173 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-02 23:43:37,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 23:43:37,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:37,174 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:37,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:43:37,174 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:37,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:37,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1450374075, now seen corresponding path program 1 times [2021-05-02 23:43:37,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:37,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156729059] [2021-05-02 23:43:37,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:37,239 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_6 0)) InVars {main_~x~0=v_main_~x~0_6} OutVars{main_~x~0=v_main_~x~0_6} AuxVars[] AssignedVars[] [2021-05-02 23:43:37,265 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:37,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:37,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:37,327 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:37,348 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:37,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:37,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:37,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:37,678 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 23:43:37,766 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:37,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156729059] [2021-05-02 23:43:37,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1156729059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:37,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:37,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:43:37,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127102959] [2021-05-02 23:43:37,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:43:37,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:37,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:43:37,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:43:37,772 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:38,129 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 23:43:38,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:43:38,130 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 23:43:38,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:38,131 INFO L225 Difference]: With dead ends: 22 [2021-05-02 23:43:38,131 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 23:43:38,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 425.5ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:43:38,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 23:43:38,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 23:43:38,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 23:43:38,138 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2021-05-02 23:43:38,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:38,138 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 23:43:38,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,139 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 23:43:38,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 23:43:38,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:38,139 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:38,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:43:38,140 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:38,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:38,140 INFO L82 PathProgramCache]: Analyzing trace with hash -757985953, now seen corresponding path program 2 times [2021-05-02 23:43:38,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:38,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219935705] [2021-05-02 23:43:38,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:38,148 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_10 0)) InVars {main_~x~0=v_main_~x~0_10} OutVars{main_~x~0=v_main_~x~0_10} AuxVars[] AssignedVars[] [2021-05-02 23:43:38,153 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:38,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:38,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:38,204 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:38,224 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:38,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:38,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:38,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:38,456 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 23:43:38,577 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:38,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219935705] [2021-05-02 23:43:38,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [219935705] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:38,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:38,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:43:38,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272223278] [2021-05-02 23:43:38,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:43:38,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:38,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:43:38,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:43:38,580 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:38,974 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-05-02 23:43:38,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:43:38,975 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 23:43:38,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:38,975 INFO L225 Difference]: With dead ends: 23 [2021-05-02 23:43:38,975 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 23:43:38,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 529.6ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:43:38,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 23:43:38,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 23:43:38,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-02 23:43:38,981 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2021-05-02 23:43:38,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:38,981 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-02 23:43:38,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:38,981 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-02 23:43:38,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 23:43:38,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:38,982 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:38,982 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:43:38,982 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:38,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:38,983 INFO L82 PathProgramCache]: Analyzing trace with hash -497670085, now seen corresponding path program 3 times [2021-05-02 23:43:38,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:38,983 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546582564] [2021-05-02 23:43:38,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:38,990 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_15 0)) InVars {main_~x~0=v_main_~x~0_15} OutVars{main_~x~0=v_main_~x~0_15} AuxVars[] AssignedVars[] [2021-05-02 23:43:38,995 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:38,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:39,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:39,034 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:39,052 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:39,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:39,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:39,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:39,238 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 23:43:39,354 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:39,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546582564] [2021-05-02 23:43:39,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [546582564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:39,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:39,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-02 23:43:39,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945255603] [2021-05-02 23:43:39,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:43:39,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:39,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:43:39,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:43:39,356 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:39,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:39,735 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 23:43:39,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:43:39,735 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 23:43:39,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:39,737 INFO L225 Difference]: With dead ends: 24 [2021-05-02 23:43:39,737 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 23:43:39,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 462.7ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:43:39,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 23:43:39,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 23:43:39,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:39,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 23:43:39,743 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2021-05-02 23:43:39,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:39,743 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 23:43:39,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:39,743 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 23:43:39,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 23:43:39,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:39,744 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:39,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:43:39,744 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:39,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:39,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1017812769, now seen corresponding path program 4 times [2021-05-02 23:43:39,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:39,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65046486] [2021-05-02 23:43:39,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:39,752 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_21 0)) InVars {main_~x~0=v_main_~x~0_21} OutVars{main_~x~0=v_main_~x~0_21} AuxVars[] AssignedVars[] [2021-05-02 23:43:39,756 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:39,771 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:39,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:39,786 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:39,819 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:39,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:39,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:39,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:39,997 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 23:43:40,197 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:40,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65046486] [2021-05-02 23:43:40,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [65046486] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:40,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:40,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:43:40,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89762566] [2021-05-02 23:43:40,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:43:40,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:40,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:43:40,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:43:40,200 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:40,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:40,721 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2021-05-02 23:43:40,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:43:40,723 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 23:43:40,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:40,724 INFO L225 Difference]: With dead ends: 25 [2021-05-02 23:43:40,728 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 23:43:40,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 629.0ms TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:43:40,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 23:43:40,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 23:43:40,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:40,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2021-05-02 23:43:40,736 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2021-05-02 23:43:40,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:40,737 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2021-05-02 23:43:40,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:40,737 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2021-05-02 23:43:40,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 23:43:40,737 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:40,738 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:40,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:43:40,738 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:40,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:40,739 INFO L82 PathProgramCache]: Analyzing trace with hash 37633211, now seen corresponding path program 5 times [2021-05-02 23:43:40,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:40,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545764821] [2021-05-02 23:43:40,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:40,747 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_28 0)) InVars {main_~x~0=v_main_~x~0_28} OutVars{main_~x~0=v_main_~x~0_28} AuxVars[] AssignedVars[] [2021-05-02 23:43:40,756 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:40,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:40,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:40,790 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:40,808 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:40,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:40,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:40,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:40,975 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 23:43:41,196 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:41,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545764821] [2021-05-02 23:43:41,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [545764821] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:41,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:41,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 23:43:41,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110356817] [2021-05-02 23:43:41,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 23:43:41,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:41,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 23:43:41,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:43:41,199 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:41,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:41,721 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2021-05-02 23:43:41,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:43:41,722 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 23:43:41,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:41,723 INFO L225 Difference]: With dead ends: 26 [2021-05-02 23:43:41,723 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 23:43:41,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 660.2ms TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:43:41,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 23:43:41,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 23:43:41,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:41,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 23:43:41,744 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2021-05-02 23:43:41,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:41,745 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 23:43:41,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:41,746 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 23:43:41,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 23:43:41,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:41,746 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:41,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:43:41,747 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:41,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:41,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1603279777, now seen corresponding path program 6 times [2021-05-02 23:43:41,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:41,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76595450] [2021-05-02 23:43:41,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:41,760 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_36 0)) InVars {main_~x~0=v_main_~x~0_36} OutVars{main_~x~0=v_main_~x~0_36} AuxVars[] AssignedVars[] [2021-05-02 23:43:41,772 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:41,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:41,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:41,805 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:41,823 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:41,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:42,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:42,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:42,081 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 23:43:42,323 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:42,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76595450] [2021-05-02 23:43:42,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [76595450] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:42,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:42,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:43:42,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084625003] [2021-05-02 23:43:42,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 23:43:42,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:42,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 23:43:42,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:43:42,326 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:42,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:42,959 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2021-05-02 23:43:42,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:43:42,960 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 23:43:42,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:42,961 INFO L225 Difference]: With dead ends: 27 [2021-05-02 23:43:42,961 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 23:43:42,962 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 755.5ms TimeCoverageRelationStatistics Valid=94, Invalid=608, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:43:42,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 23:43:42,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 23:43:42,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:42,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-05-02 23:43:42,967 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2021-05-02 23:43:42,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:42,967 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-05-02 23:43:42,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:42,968 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-05-02 23:43:42,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 23:43:42,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:42,968 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:42,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:43:42,969 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:42,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:42,969 INFO L82 PathProgramCache]: Analyzing trace with hash -931974853, now seen corresponding path program 7 times [2021-05-02 23:43:42,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:42,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326305754] [2021-05-02 23:43:42,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:42,976 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_45 0)) InVars {main_~x~0=v_main_~x~0_45} OutVars{main_~x~0=v_main_~x~0_45} AuxVars[] AssignedVars[] [2021-05-02 23:43:42,980 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:42,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:42,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:43,010 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:43,028 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:43,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:43,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:43,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:43,181 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 23:43:43,463 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:43,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326305754] [2021-05-02 23:43:43,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1326305754] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:43,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:43,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-02 23:43:43,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127411288] [2021-05-02 23:43:43,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:43:43,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:43,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:43:43,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:43:43,465 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:44,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:44,142 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2021-05-02 23:43:44,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:43:44,142 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 23:43:44,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:44,143 INFO L225 Difference]: With dead ends: 28 [2021-05-02 23:43:44,143 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 23:43:44,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 832.6ms TimeCoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:43:44,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 23:43:44,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 23:43:44,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:44,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 23:43:44,150 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2021-05-02 23:43:44,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:44,150 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 23:43:44,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:44,151 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 23:43:44,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 23:43:44,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:44,151 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:44,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:43:44,152 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:44,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:44,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1596358689, now seen corresponding path program 8 times [2021-05-02 23:43:44,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:44,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808789424] [2021-05-02 23:43:44,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:44,159 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_55 0)) InVars {main_~x~0=v_main_~x~0_55} OutVars{main_~x~0=v_main_~x~0_55} AuxVars[] AssignedVars[] [2021-05-02 23:43:44,162 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:44,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:44,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:44,193 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:44,208 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:44,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:44,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:44,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:44,333 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 23:43:44,665 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:44,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808789424] [2021-05-02 23:43:44,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [808789424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:44,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:44,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:43:44,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560694553] [2021-05-02 23:43:44,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:43:44,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:44,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:43:44,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:43:44,668 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:45,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:45,498 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2021-05-02 23:43:45,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:43:45,499 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 23:43:45,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:45,500 INFO L225 Difference]: With dead ends: 29 [2021-05-02 23:43:45,500 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 23:43:45,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 988.5ms TimeCoverageRelationStatistics Valid=121, Invalid=809, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:43:45,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 23:43:45,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 23:43:45,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:45,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-05-02 23:43:45,507 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2021-05-02 23:43:45,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:45,507 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-05-02 23:43:45,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:45,508 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-05-02 23:43:45,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:43:45,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:45,508 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:45,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:43:45,509 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:45,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:45,509 INFO L82 PathProgramCache]: Analyzing trace with hash -717421125, now seen corresponding path program 9 times [2021-05-02 23:43:45,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:45,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042801910] [2021-05-02 23:43:45,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:45,517 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_66 0)) InVars {main_~x~0=v_main_~x~0_66} OutVars{main_~x~0=v_main_~x~0_66} AuxVars[] AssignedVars[] [2021-05-02 23:43:45,521 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:45,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:45,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:45,557 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:45,575 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:45,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:45,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:45,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:45,813 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 23:43:46,195 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:46,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042801910] [2021-05-02 23:43:46,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2042801910] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:46,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:46,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:43:46,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164621196] [2021-05-02 23:43:46,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:43:46,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:46,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:43:46,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=301, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:43:46,197 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 15 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:47,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:47,155 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 23:43:47,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:43:47,156 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.125) internal successors, (18), 15 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 23:43:47,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:47,157 INFO L225 Difference]: With dead ends: 30 [2021-05-02 23:43:47,157 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 23:43:47,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 1190.5ms TimeCoverageRelationStatistics Valid=112, Invalid=944, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:43:47,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 23:43:47,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 23:43:47,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:47,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-05-02 23:43:47,177 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2021-05-02 23:43:47,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:47,178 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-05-02 23:43:47,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.125) internal successors, (18), 15 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:47,178 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-05-02 23:43:47,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 23:43:47,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:47,179 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:47,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:43:47,182 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:47,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:47,183 INFO L82 PathProgramCache]: Analyzing trace with hash 759839583, now seen corresponding path program 10 times [2021-05-02 23:43:47,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:47,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596647368] [2021-05-02 23:43:47,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:47,194 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_78 0)) InVars {main_~x~0=v_main_~x~0_78} OutVars{main_~x~0=v_main_~x~0_78} AuxVars[] AssignedVars[] [2021-05-02 23:43:47,198 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:47,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:47,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:47,235 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:47,251 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:47,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:47,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:47,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:47,421 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 23:43:47,765 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:47,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596647368] [2021-05-02 23:43:47,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [596647368] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:47,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:47,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:43:47,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125612091] [2021-05-02 23:43:47,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:43:47,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:47,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:43:47,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=337, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:43:47,768 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:48,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:48,706 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2021-05-02 23:43:48,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:43:48,707 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 23:43:48,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:48,708 INFO L225 Difference]: With dead ends: 31 [2021-05-02 23:43:48,708 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 23:43:48,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 1103.6ms TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:43:48,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 23:43:48,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 23:43:48,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:48,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-05-02 23:43:48,713 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2021-05-02 23:43:48,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:48,713 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-05-02 23:43:48,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:48,714 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-05-02 23:43:48,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 23:43:48,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:48,714 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:48,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:43:48,715 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:48,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:48,715 INFO L82 PathProgramCache]: Analyzing trace with hash -689718725, now seen corresponding path program 11 times [2021-05-02 23:43:48,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:48,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195528784] [2021-05-02 23:43:48,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:48,722 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_91 0)) InVars {main_~x~0=v_main_~x~0_91} OutVars{main_~x~0=v_main_~x~0_91} AuxVars[] AssignedVars[] [2021-05-02 23:43:48,725 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:48,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:48,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:48,756 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:48,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:48,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:48,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:48,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:48,950 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 23:43:49,416 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:49,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195528784] [2021-05-02 23:43:49,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [195528784] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:49,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:49,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:43:49,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543771729] [2021-05-02 23:43:49,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:43:49,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:49,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:43:49,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:43:49,419 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:50,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:50,555 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2021-05-02 23:43:50,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:43:50,556 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 23:43:50,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:50,557 INFO L225 Difference]: With dead ends: 32 [2021-05-02 23:43:50,557 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 23:43:50,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1342.2ms TimeCoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:43:50,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 23:43:50,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 23:43:50,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:50,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2021-05-02 23:43:50,565 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2021-05-02 23:43:50,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:50,566 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2021-05-02 23:43:50,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 17 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:50,566 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2021-05-02 23:43:50,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:43:50,567 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:50,567 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:50,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:43:50,568 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:50,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:50,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1618613983, now seen corresponding path program 12 times [2021-05-02 23:43:50,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:50,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233668377] [2021-05-02 23:43:50,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:50,588 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_105 0)) InVars {main_~x~0=v_main_~x~0_105} OutVars{main_~x~0=v_main_~x~0_105} AuxVars[] AssignedVars[] [2021-05-02 23:43:50,594 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:50,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:50,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:50,650 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:50,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:50,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:50,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:50,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:50,844 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 23:43:51,382 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:51,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233668377] [2021-05-02 23:43:51,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1233668377] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:51,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:51,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:43:51,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163928540] [2021-05-02 23:43:51,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:43:51,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:51,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:43:51,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:43:51,385 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:52,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:52,769 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 23:43:52,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:43:52,770 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 23:43:52,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:52,771 INFO L225 Difference]: With dead ends: 33 [2021-05-02 23:43:52,771 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 23:43:52,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 1601.4ms TimeCoverageRelationStatistics Valid=154, Invalid=1328, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:43:52,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 23:43:52,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 23:43:52,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:52,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-05-02 23:43:52,782 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2021-05-02 23:43:52,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:52,782 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-05-02 23:43:52,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:52,783 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-05-02 23:43:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 23:43:52,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:52,783 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:52,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:43:52,784 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:52,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:52,785 INFO L82 PathProgramCache]: Analyzing trace with hash 162483899, now seen corresponding path program 13 times [2021-05-02 23:43:52,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:52,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65204051] [2021-05-02 23:43:52,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:52,802 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_120 0)) InVars {main_~x~0=v_main_~x~0_120} OutVars{main_~x~0=v_main_~x~0_120} AuxVars[] AssignedVars[] [2021-05-02 23:43:52,808 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:52,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:52,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:52,864 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:52,887 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:52,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:53,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:53,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:53,107 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 23:43:53,961 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:53,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65204051] [2021-05-02 23:43:53,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [65204051] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:53,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:53,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:43:53,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166907062] [2021-05-02 23:43:53,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:43:53,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:53,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:43:53,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:43:53,965 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:55,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:55,462 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2021-05-02 23:43:55,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 23:43:55,464 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.1) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 23:43:55,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:55,465 INFO L225 Difference]: With dead ends: 34 [2021-05-02 23:43:55,465 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 23:43:55,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 1991.2ms TimeCoverageRelationStatistics Valid=162, Invalid=1478, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:43:55,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 23:43:55,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 23:43:55,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:55,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-05-02 23:43:55,475 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2021-05-02 23:43:55,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:55,475 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-05-02 23:43:55,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.1) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:55,475 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-05-02 23:43:55,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 23:43:55,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:55,476 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:55,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:43:55,477 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:55,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:55,478 INFO L82 PathProgramCache]: Analyzing trace with hash -2027875745, now seen corresponding path program 14 times [2021-05-02 23:43:55,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:55,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530864921] [2021-05-02 23:43:55,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:55,493 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_136 0)) InVars {main_~x~0=v_main_~x~0_136} OutVars{main_~x~0=v_main_~x~0_136} AuxVars[] AssignedVars[] [2021-05-02 23:43:55,497 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:55,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:55,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:55,547 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:55,565 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:55,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:55,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:55,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:55,800 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 23:43:56,595 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:56,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530864921] [2021-05-02 23:43:56,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1530864921] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:56,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:56,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-02 23:43:56,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211396021] [2021-05-02 23:43:56,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 23:43:56,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:56,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 23:43:56,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=488, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:43:56,597 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:57,939 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 37 [2021-05-02 23:43:58,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:58,219 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2021-05-02 23:43:58,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:43:58,220 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 23:43:58,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:58,220 INFO L225 Difference]: With dead ends: 35 [2021-05-02 23:43:58,220 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 23:43:58,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 2028.5ms TimeCoverageRelationStatistics Valid=169, Invalid=1637, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:43:58,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 23:43:58,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 23:43:58,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:58,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2021-05-02 23:43:58,227 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2021-05-02 23:43:58,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:58,227 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2021-05-02 23:43:58,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:43:58,228 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2021-05-02 23:43:58,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:43:58,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:58,229 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:58,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:43:58,229 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:58,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:58,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1209547973, now seen corresponding path program 15 times [2021-05-02 23:43:58,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:58,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698520153] [2021-05-02 23:43:58,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:58,236 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_153 0)) InVars {main_~x~0=v_main_~x~0_153} OutVars{main_~x~0=v_main_~x~0_153} AuxVars[] AssignedVars[] [2021-05-02 23:43:58,240 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:43:58,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:58,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:43:58,273 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:43:58,290 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:58,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:58,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:58,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:58,460 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 23:43:59,181 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:59,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698520153] [2021-05-02 23:43:59,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1698520153] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:59,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:59,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:43:59,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406410646] [2021-05-02 23:43:59,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:43:59,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:59,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:43:59,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=533, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:43:59,183 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:00,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:00,689 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2021-05-02 23:44:00,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 23:44:00,690 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 23:44:00,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:00,691 INFO L225 Difference]: With dead ends: 36 [2021-05-02 23:44:00,691 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 23:44:00,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 1888.9ms TimeCoverageRelationStatistics Valid=177, Invalid=1803, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:44:00,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 23:44:00,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 23:44:00,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:00,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 23:44:00,698 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2021-05-02 23:44:00,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:00,698 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 23:44:00,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 21 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:00,698 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 23:44:00,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:44:00,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:00,699 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:00,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:44:00,699 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:00,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:00,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1611190817, now seen corresponding path program 16 times [2021-05-02 23:44:00,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:00,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544016042] [2021-05-02 23:44:00,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:00,707 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_171 0)) InVars {main_~x~0=v_main_~x~0_171} OutVars{main_~x~0=v_main_~x~0_171} AuxVars[] AssignedVars[] [2021-05-02 23:44:00,718 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:00,719 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:00,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:00,747 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:00,763 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:00,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:00,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:00,921 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 23:44:01,701 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:01,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544016042] [2021-05-02 23:44:01,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [544016042] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:01,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:01,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:44:01,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970015309] [2021-05-02 23:44:01,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:44:01,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:01,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:44:01,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=595, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:44:01,706 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:03,454 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 36 [2021-05-02 23:44:03,635 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 40 [2021-05-02 23:44:03,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:03,782 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2021-05-02 23:44:03,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:44:03,783 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 23:44:03,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:03,784 INFO L225 Difference]: With dead ends: 37 [2021-05-02 23:44:03,784 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 23:44:03,787 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 2397.2ms TimeCoverageRelationStatistics Valid=154, Invalid=2008, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:44:03,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 23:44:03,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 23:44:03,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:03,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2021-05-02 23:44:03,795 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2021-05-02 23:44:03,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:03,796 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2021-05-02 23:44:03,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:03,796 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2021-05-02 23:44:03,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 23:44:03,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:03,797 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:03,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:44:03,797 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:03,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:03,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1177217093, now seen corresponding path program 17 times [2021-05-02 23:44:03,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:03,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107337577] [2021-05-02 23:44:03,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:03,816 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_190 0)) InVars {main_~x~0=v_main_~x~0_190} OutVars{main_~x~0=v_main_~x~0_190} AuxVars[] AssignedVars[] [2021-05-02 23:44:03,821 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:03,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:03,843 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:03,856 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:03,876 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:04,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:04,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:04,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:44:05,174 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:05,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107337577] [2021-05-02 23:44:05,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1107337577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:05,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:05,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-02 23:44:05,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998885068] [2021-05-02 23:44:05,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 23:44:05,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:05,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 23:44:05,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:44:05,176 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:07,112 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 38 [2021-05-02 23:44:07,288 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 23:44:07,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:07,390 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 23:44:07,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 23:44:07,391 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 23:44:07,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:07,391 INFO L225 Difference]: With dead ends: 38 [2021-05-02 23:44:07,391 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 23:44:07,392 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 2750.8ms TimeCoverageRelationStatistics Valid=194, Invalid=2158, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:44:07,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 23:44:07,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 23:44:07,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:07,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2021-05-02 23:44:07,399 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2021-05-02 23:44:07,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:07,399 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2021-05-02 23:44:07,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:07,399 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2021-05-02 23:44:07,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:44:07,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:07,400 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:07,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:44:07,400 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:07,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:07,400 INFO L82 PathProgramCache]: Analyzing trace with hash -608933537, now seen corresponding path program 18 times [2021-05-02 23:44:07,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:07,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284180024] [2021-05-02 23:44:07,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:07,414 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_210 0)) InVars {main_~x~0=v_main_~x~0_210} OutVars{main_~x~0=v_main_~x~0_210} AuxVars[] AssignedVars[] [2021-05-02 23:44:07,419 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:07,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:07,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:07,461 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:07,480 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:07,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:07,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:07,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:07,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:44:09,048 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:09,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284180024] [2021-05-02 23:44:09,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1284180024] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:09,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:09,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:44:09,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710976105] [2021-05-02 23:44:09,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:44:09,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:09,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:44:09,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=680, Unknown=0, NotChecked=0, Total=756 [2021-05-02 23:44:09,051 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:11,015 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 37 [2021-05-02 23:44:11,213 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 42 [2021-05-02 23:44:11,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:11,335 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2021-05-02 23:44:11,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:44:11,336 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 23:44:11,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:11,336 INFO L225 Difference]: With dead ends: 39 [2021-05-02 23:44:11,336 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 23:44:11,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 3107.8ms TimeCoverageRelationStatistics Valid=201, Invalid=2349, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:44:11,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 23:44:11,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 23:44:11,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:11,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 23:44:11,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2021-05-02 23:44:11,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:11,346 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 23:44:11,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:11,346 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 23:44:11,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 23:44:11,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:11,348 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:11,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:44:11,348 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:11,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:11,349 INFO L82 PathProgramCache]: Analyzing trace with hash -172012485, now seen corresponding path program 19 times [2021-05-02 23:44:11,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:11,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456738719] [2021-05-02 23:44:11,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:11,359 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_231 0)) InVars {main_~x~0=v_main_~x~0_231} OutVars{main_~x~0=v_main_~x~0_231} AuxVars[] AssignedVars[] [2021-05-02 23:44:11,363 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:11,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:11,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:11,395 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:11,414 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:11,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:11,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:11,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:11,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:44:12,928 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:12,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456738719] [2021-05-02 23:44:12,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [456738719] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:12,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:12,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:44:12,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498378348] [2021-05-02 23:44:12,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:44:12,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:12,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:44:12,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:44:12,931 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 25 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:15,146 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 37 [2021-05-02 23:44:15,356 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 42 [2021-05-02 23:44:15,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:15,482 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2021-05-02 23:44:15,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 23:44:15,483 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 25 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 23:44:15,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:15,484 INFO L225 Difference]: With dead ends: 40 [2021-05-02 23:44:15,484 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 23:44:15,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 3358.5ms TimeCoverageRelationStatistics Valid=210, Invalid=2546, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:44:15,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 23:44:15,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 23:44:15,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:15,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2021-05-02 23:44:15,493 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2021-05-02 23:44:15,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:15,493 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2021-05-02 23:44:15,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 25 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:15,493 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2021-05-02 23:44:15,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:44:15,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:15,494 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:15,494 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:44:15,494 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:15,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:15,495 INFO L82 PathProgramCache]: Analyzing trace with hash 487638239, now seen corresponding path program 20 times [2021-05-02 23:44:15,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:15,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423856348] [2021-05-02 23:44:15,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:15,514 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_253 0)) InVars {main_~x~0=v_main_~x~0_253} OutVars{main_~x~0=v_main_~x~0_253} AuxVars[] AssignedVars[] [2021-05-02 23:44:15,517 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:15,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:15,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:15,552 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:15,572 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:15,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:15,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:15,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:15,737 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 23:44:17,266 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:17,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423856348] [2021-05-02 23:44:17,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [423856348] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:17,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:17,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-02 23:44:17,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49129966] [2021-05-02 23:44:17,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 23:44:17,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:17,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 23:44:17,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=788, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:44:17,268 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:19,728 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:44:19,910 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 36 [2021-05-02 23:44:20,113 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 40 [2021-05-02 23:44:20,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:20,236 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2021-05-02 23:44:20,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 23:44:20,237 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 23:44:20,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:20,238 INFO L225 Difference]: With dead ends: 41 [2021-05-02 23:44:20,238 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 23:44:20,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 3796.7ms TimeCoverageRelationStatistics Valid=217, Invalid=2753, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:44:20,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 23:44:20,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 23:44:20,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:20,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2021-05-02 23:44:20,246 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2021-05-02 23:44:20,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:20,246 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2021-05-02 23:44:20,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:20,246 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2021-05-02 23:44:20,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:44:20,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:20,247 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:20,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:44:20,247 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:20,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:20,248 INFO L82 PathProgramCache]: Analyzing trace with hash -538025797, now seen corresponding path program 21 times [2021-05-02 23:44:20,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:20,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636173704] [2021-05-02 23:44:20,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:20,256 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_276 0)) InVars {main_~x~0=v_main_~x~0_276} OutVars{main_~x~0=v_main_~x~0_276} AuxVars[] AssignedVars[] [2021-05-02 23:44:20,258 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:20,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:20,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:20,300 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:20,321 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:20,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:20,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:20,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:20,542 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 23:44:22,498 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:22,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636173704] [2021-05-02 23:44:22,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1636173704] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:22,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:22,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:44:22,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138993944] [2021-05-02 23:44:22,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:44:22,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:22,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:44:22,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:44:22,500 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 27 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:24,885 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:44:25,058 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:44:25,243 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:44:25,430 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 37 [2021-05-02 23:44:25,675 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 42 [2021-05-02 23:44:25,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:25,804 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2021-05-02 23:44:25,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 23:44:25,805 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 27 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 23:44:25,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:25,805 INFO L225 Difference]: With dead ends: 42 [2021-05-02 23:44:25,805 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 23:44:25,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 4554.5ms TimeCoverageRelationStatistics Valid=225, Invalid=2967, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:44:25,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 23:44:25,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 23:44:25,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:25,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 23:44:25,813 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2021-05-02 23:44:25,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:25,814 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 23:44:25,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 27 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:25,814 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 23:44:25,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:44:25,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:25,814 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:25,814 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:44:25,815 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:25,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:25,815 INFO L82 PathProgramCache]: Analyzing trace with hash 2026127455, now seen corresponding path program 22 times [2021-05-02 23:44:25,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:25,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332376296] [2021-05-02 23:44:25,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:25,820 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_300 0)) InVars {main_~x~0=v_main_~x~0_300} OutVars{main_~x~0=v_main_~x~0_300} AuxVars[] AssignedVars[] [2021-05-02 23:44:25,822 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:25,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:25,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:25,849 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:25,865 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:25,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:26,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:26,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:26,076 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 23:44:27,579 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:27,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332376296] [2021-05-02 23:44:27,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [332376296] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:27,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:27,580 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:44:27,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050713971] [2021-05-02 23:44:27,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:44:27,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:27,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:44:27,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=925, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:44:27,581 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:29,886 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2021-05-02 23:44:30,117 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 37 [2021-05-02 23:44:30,418 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 41 [2021-05-02 23:44:30,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:30,633 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2021-05-02 23:44:30,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 23:44:30,635 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 23:44:30,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:30,636 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:44:30,636 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 23:44:30,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 3913.9ms TimeCoverageRelationStatistics Valid=190, Invalid=3232, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:44:30,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 23:44:30,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 23:44:30,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:30,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-05-02 23:44:30,644 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2021-05-02 23:44:30,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:30,645 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-05-02 23:44:30,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:30,645 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-05-02 23:44:30,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 23:44:30,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:30,646 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:30,646 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:44:30,646 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:30,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:30,647 INFO L82 PathProgramCache]: Analyzing trace with hash -89500357, now seen corresponding path program 23 times [2021-05-02 23:44:30,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:30,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558357978] [2021-05-02 23:44:30,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:30,658 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_325 0)) InVars {main_~x~0=v_main_~x~0_325} OutVars{main_~x~0=v_main_~x~0_325} AuxVars[] AssignedVars[] [2021-05-02 23:44:30,662 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:30,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:30,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:30,720 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:30,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:30,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:30,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:30,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:30,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:44:33,522 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:33,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558357978] [2021-05-02 23:44:33,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [558357978] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:33,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:33,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-02 23:44:33,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267966638] [2021-05-02 23:44:33,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 23:44:33,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:33,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 23:44:33,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=987, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:44:33,525 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 29 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:36,905 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:44:37,074 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:44:37,255 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:44:37,441 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 37 [2021-05-02 23:44:37,663 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 41 [2021-05-02 23:44:37,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:37,839 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2021-05-02 23:44:37,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 23:44:37,841 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 29 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 23:44:37,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:37,841 INFO L225 Difference]: With dead ends: 44 [2021-05-02 23:44:37,841 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:44:37,842 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 5850.4ms TimeCoverageRelationStatistics Valid=196, Invalid=3464, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:44:37,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:44:37,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 23:44:37,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:37,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2021-05-02 23:44:37,850 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2021-05-02 23:44:37,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:37,850 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2021-05-02 23:44:37,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 29 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:37,850 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2021-05-02 23:44:37,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:44:37,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:37,851 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:37,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:44:37,851 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:37,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:37,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1249453089, now seen corresponding path program 24 times [2021-05-02 23:44:37,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:37,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488230343] [2021-05-02 23:44:37,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:37,858 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_351 0)) InVars {main_~x~0=v_main_~x~0_351} OutVars{main_~x~0=v_main_~x~0_351} AuxVars[] AssignedVars[] [2021-05-02 23:44:37,860 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:37,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:37,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:37,910 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:37,933 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:37,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:38,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:38,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:38,092 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 23:44:40,685 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:40,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488230343] [2021-05-02 23:44:40,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [488230343] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:40,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:40,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:44:40,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573362341] [2021-05-02 23:44:40,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:44:40,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:40,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:44:40,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:44:40,688 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:43,846 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:44:44,659 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:44:44,823 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 38 [2021-05-02 23:44:45,012 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 42 [2021-05-02 23:44:45,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:45,127 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2021-05-02 23:44:45,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 23:44:45,128 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 23:44:45,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:45,129 INFO L225 Difference]: With dead ends: 45 [2021-05-02 23:44:45,129 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 23:44:45,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 5911.9ms TimeCoverageRelationStatistics Valid=250, Invalid=3656, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:44:45,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 23:44:45,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 23:44:45,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:45,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2021-05-02 23:44:45,138 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2021-05-02 23:44:45,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:45,138 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2021-05-02 23:44:45,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:45,139 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2021-05-02 23:44:45,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 23:44:45,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:45,139 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:45,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:44:45,139 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:45,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:45,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1446717883, now seen corresponding path program 25 times [2021-05-02 23:44:45,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:45,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53422733] [2021-05-02 23:44:45,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:45,153 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_378 0)) InVars {main_~x~0=v_main_~x~0_378} OutVars{main_~x~0=v_main_~x~0_378} AuxVars[] AssignedVars[] [2021-05-02 23:44:45,155 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:45,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:45,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:45,185 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:45,201 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:45,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:45,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:45,358 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 23:44:47,410 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:47,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53422733] [2021-05-02 23:44:47,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53422733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:47,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:47,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:44:47,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518920692] [2021-05-02 23:44:47,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:44:47,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:47,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:44:47,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1117, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:44:47,412 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 31 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:49,461 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:44:49,686 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:44:49,898 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:44:50,132 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:44:50,344 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:44:50,586 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:44:50,838 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:44:51,087 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:44:51,330 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 36 [2021-05-02 23:44:51,611 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 40 [2021-05-02 23:44:51,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:51,860 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-05-02 23:44:51,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 23:44:51,862 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.0625) internal successors, (34), 31 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 23:44:51,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:51,863 INFO L225 Difference]: With dead ends: 46 [2021-05-02 23:44:51,863 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 23:44:51,864 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 648 ImplicationChecksByTransitivity, 5532.7ms TimeCoverageRelationStatistics Valid=208, Invalid=3952, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:44:51,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 23:44:51,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 23:44:51,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:51,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2021-05-02 23:44:51,873 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2021-05-02 23:44:51,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:51,873 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2021-05-02 23:44:51,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.0625) internal successors, (34), 31 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:51,873 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2021-05-02 23:44:51,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:44:51,874 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:51,874 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:51,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:44:51,874 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:51,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:51,875 INFO L82 PathProgramCache]: Analyzing trace with hash -871327905, now seen corresponding path program 26 times [2021-05-02 23:44:51,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:51,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854756630] [2021-05-02 23:44:51,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:51,886 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_406 0)) InVars {main_~x~0=v_main_~x~0_406} OutVars{main_~x~0=v_main_~x~0_406} AuxVars[] AssignedVars[] [2021-05-02 23:44:51,889 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:51,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:51,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:51,943 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:51,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:51,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:52,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:52,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:52,217 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 23:44:54,638 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:44:55,339 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:55,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854756630] [2021-05-02 23:44:55,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1854756630] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:55,339 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:55,339 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:44:55,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263638407] [2021-05-02 23:44:55,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:44:55,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:55,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:44:55,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1161, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 23:44:55,341 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:58,489 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:44:58,670 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:44:58,867 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 38 [2021-05-02 23:44:59,226 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 42 [2021-05-02 23:44:59,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:59,434 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2021-05-02 23:44:59,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 23:44:59,436 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 23:44:59,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:59,436 INFO L225 Difference]: With dead ends: 47 [2021-05-02 23:44:59,436 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 23:44:59,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 576 ImplicationChecksByTransitivity, 6303.4ms TimeCoverageRelationStatistics Valid=264, Invalid=4158, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:44:59,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 23:44:59,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-02 23:44:59,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:59,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2021-05-02 23:44:59,444 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2021-05-02 23:44:59,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:59,445 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2021-05-02 23:44:59,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:44:59,445 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2021-05-02 23:44:59,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:44:59,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:59,445 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:59,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:44:59,446 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:59,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:59,446 INFO L82 PathProgramCache]: Analyzing trace with hash 283696699, now seen corresponding path program 27 times [2021-05-02 23:44:59,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:59,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192859611] [2021-05-02 23:44:59,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:59,455 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_435 0)) InVars {main_~x~0=v_main_~x~0_435} OutVars{main_~x~0=v_main_~x~0_435} AuxVars[] AssignedVars[] [2021-05-02 23:44:59,464 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:44:59,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:59,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:44:59,519 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:44:59,548 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:59,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:59,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:59,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:59,787 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 23:45:01,986 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:02,275 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:02,562 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:02,565 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:02,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192859611] [2021-05-02 23:45:02,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1192859611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:02,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:02,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:45:02,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584633166] [2021-05-02 23:45:02,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:45:02,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:02,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:45:02,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1229, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:45:02,567 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 33 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:05,048 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:45:05,481 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:05,745 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:05,999 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:06,254 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:06,510 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:06,776 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:45:07,059 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:45:07,348 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:45:07,609 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:45:07,941 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:45:08,253 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:45:08,578 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:45:08,919 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:45:09,289 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 36 [2021-05-02 23:45:09,664 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 41 [2021-05-02 23:45:09,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:09,904 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2021-05-02 23:45:09,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 23:45:09,905 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 33 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 23:45:09,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:09,906 INFO L225 Difference]: With dead ends: 48 [2021-05-02 23:45:09,906 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 23:45:09,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 8380.9ms TimeCoverageRelationStatistics Valid=273, Invalid=4419, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:45:09,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 23:45:09,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 23:45:09,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:09,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2021-05-02 23:45:09,915 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2021-05-02 23:45:09,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:09,915 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2021-05-02 23:45:09,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 33 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:09,915 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2021-05-02 23:45:09,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 23:45:09,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:09,916 INFO L523 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:09,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:45:09,916 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:09,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:09,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1729721055, now seen corresponding path program 28 times [2021-05-02 23:45:09,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:09,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949233796] [2021-05-02 23:45:09,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:09,925 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_465 0)) InVars {main_~x~0=v_main_~x~0_465} OutVars{main_~x~0=v_main_~x~0_465} AuxVars[] AssignedVars[] [2021-05-02 23:45:09,934 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:45:09,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:09,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:45:09,983 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:45:10,014 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:10,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:10,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:10,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:10,292 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 23:45:13,017 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:13,252 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:13,500 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:13,753 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:14,021 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:14,301 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:45:14,303 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:14,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949233796] [2021-05-02 23:45:14,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1949233796] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:14,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:14,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-02 23:45:14,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796514829] [2021-05-02 23:45:14,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 23:45:14,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:14,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 23:45:14,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1327, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 23:45:14,304 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:18,048 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:45:18,219 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:45:18,406 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:45:18,598 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:45:18,796 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:45:18,997 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 37 [2021-05-02 23:45:19,219 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 41 [2021-05-02 23:45:19,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:19,404 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2021-05-02 23:45:19,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 23:45:19,404 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 23:45:19,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:19,405 INFO L225 Difference]: With dead ends: 49 [2021-05-02 23:45:19,405 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 23:45:19,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 7905.9ms TimeCoverageRelationStatistics Valid=226, Invalid=4744, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:45:19,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 23:45:19,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 23:45:19,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:19,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2021-05-02 23:45:19,411 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2021-05-02 23:45:19,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:19,412 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2021-05-02 23:45:19,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:19,412 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2021-05-02 23:45:19,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 23:45:19,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:19,412 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:19,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:45:19,412 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:19,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:19,413 INFO L82 PathProgramCache]: Analyzing trace with hash -688164165, now seen corresponding path program 29 times [2021-05-02 23:45:19,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:19,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121241391] [2021-05-02 23:45:19,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:19,419 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_496 0)) InVars {main_~x~0=v_main_~x~0_496} OutVars{main_~x~0=v_main_~x~0_496} AuxVars[] AssignedVars[] [2021-05-02 23:45:19,421 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:45:19,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:19,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:45:19,446 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:45:19,463 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:19,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:19,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:19,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:19,719 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 23:45:22,129 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:45:22,368 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:45:22,635 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:45:22,874 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:45:23,129 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:45:23,378 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:45:23,663 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:45:23,964 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:45:24,264 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:45:24,267 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:24,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121241391] [2021-05-02 23:45:24,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2121241391] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:24,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:24,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-02 23:45:24,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645303236] [2021-05-02 23:45:24,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 23:45:24,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:24,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 23:45:24,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1401, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:45:24,268 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 35 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:28,102 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:45:28,280 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:45:28,468 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:45:28,653 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:45:28,855 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:45:29,064 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 37 [2021-05-02 23:45:29,402 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 41 [2021-05-02 23:45:29,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:29,633 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2021-05-02 23:45:29,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 23:45:29,634 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 35 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 23:45:29,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:29,634 INFO L225 Difference]: With dead ends: 50 [2021-05-02 23:45:29,634 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 23:45:29,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 8579.5ms TimeCoverageRelationStatistics Valid=232, Invalid=5024, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:45:29,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 23:45:29,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 23:45:29,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:29,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2021-05-02 23:45:29,641 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2021-05-02 23:45:29,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:29,641 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2021-05-02 23:45:29,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 35 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:29,641 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2021-05-02 23:45:29,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:45:29,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:29,642 INFO L523 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:29,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:45:29,642 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:29,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:29,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1666805343, now seen corresponding path program 30 times [2021-05-02 23:45:29,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:29,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343357992] [2021-05-02 23:45:29,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:29,647 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_528 0)) InVars {main_~x~0=v_main_~x~0_528} OutVars{main_~x~0=v_main_~x~0_528} AuxVars[] AssignedVars[] [2021-05-02 23:45:29,649 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:45:29,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:29,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:45:29,679 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:45:29,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:29,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:29,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:29,904 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 23:45:31,429 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:45:31,687 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:45:31,979 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:45:32,274 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:32,561 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:32,882 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:33,222 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:33,627 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:33,991 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:45:34,382 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:45:34,823 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:45:34,827 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:34,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343357992] [2021-05-02 23:45:34,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1343357992] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:34,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:34,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-02 23:45:34,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994035638] [2021-05-02 23:45:34,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 23:45:34,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:34,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 23:45:34,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1448, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 23:45:34,829 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:37,165 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:45:37,470 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:45:37,806 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:45:38,060 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:45:38,370 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:45:38,685 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:45:39,013 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:39,360 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:39,714 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:40,043 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:40,627 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:45:40,883 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:45:41,100 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:45:41,301 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:45:41,503 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:45:41,740 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:45:41,965 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:45:42,188 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:45:42,430 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:45:42,760 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:45:43,221 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 37 [2021-05-02 23:45:43,795 WARN L205 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 42 [2021-05-02 23:45:44,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:44,164 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2021-05-02 23:45:44,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 23:45:44,168 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 23:45:44,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:44,168 INFO L225 Difference]: With dead ends: 51 [2021-05-02 23:45:44,168 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 23:45:44,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 783 ImplicationChecksByTransitivity, 11697.0ms TimeCoverageRelationStatistics Valid=297, Invalid=5253, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:45:44,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 23:45:44,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 23:45:44,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:44,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-02 23:45:44,177 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2021-05-02 23:45:44,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:44,178 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-02 23:45:44,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:44,178 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-02 23:45:44,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 23:45:44,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:44,179 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:44,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:45:44,179 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:44,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:44,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1656416059, now seen corresponding path program 31 times [2021-05-02 23:45:44,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:44,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546231938] [2021-05-02 23:45:44,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:44,194 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_561 0)) InVars {main_~x~0=v_main_~x~0_561} OutVars{main_~x~0=v_main_~x~0_561} AuxVars[] AssignedVars[] [2021-05-02 23:45:44,198 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:45:44,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:44,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:45:44,288 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:45:44,347 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:44,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:44,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:44,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:44,645 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 23:45:44,751 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-02 23:45:46,353 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:45:46,571 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:45:46,807 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:45:47,059 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:45:47,309 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:45:47,630 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:45:47,902 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:45:48,233 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:45:48,562 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:45:48,889 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:49,300 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:49,720 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:50,070 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:50,461 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:50,884 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:45:51,351 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:45:51,796 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:45:52,305 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:45:52,309 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:52,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546231938] [2021-05-02 23:45:52,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [546231938] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:52,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:52,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-02 23:45:52,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551313507] [2021-05-02 23:45:52,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 23:45:52,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:52,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 23:45:52,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1525, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:45:52,311 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:45:54,792 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:45:55,116 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:45:55,413 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:45:55,737 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:45:56,048 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:45:56,372 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:45:56,718 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:45:57,092 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:45:57,483 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:45:57,864 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:45:58,276 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:45:58,699 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:45:59,163 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:45:59,594 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:46:00,073 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:46:00,539 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:46:01,031 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:46:01,460 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:46:01,960 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:46:02,456 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:46:02,959 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:46:03,486 WARN L205 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:46:04,016 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:46:04,560 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:46:05,037 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 36 [2021-05-02 23:46:05,679 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 40 [2021-05-02 23:46:06,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:46:06,105 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2021-05-02 23:46:06,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 23:46:06,109 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 23:46:06,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:46:06,110 INFO L225 Difference]: With dead ends: 52 [2021-05-02 23:46:06,110 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 23:46:06,111 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 17875.9ms TimeCoverageRelationStatistics Valid=305, Invalid=5547, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:46:06,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 23:46:06,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 23:46:06,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:06,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2021-05-02 23:46:06,118 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2021-05-02 23:46:06,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:46:06,118 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2021-05-02 23:46:06,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:06,118 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2021-05-02 23:46:06,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:46:06,119 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:46:06,119 INFO L523 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:46:06,119 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:46:06,119 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:46:06,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:46:06,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1334348255, now seen corresponding path program 32 times [2021-05-02 23:46:06,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:46:06,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35749819] [2021-05-02 23:46:06,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:46:06,141 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_595 0)) InVars {main_~x~0=v_main_~x~0_595} OutVars{main_~x~0=v_main_~x~0_595} AuxVars[] AssignedVars[] [2021-05-02 23:46:06,146 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:46:06,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:46:06,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:46:06,250 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:46:06,322 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:46:06,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:06,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:46:06,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:06,555 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 23:46:07,820 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:46:08,062 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 23:46:08,309 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:46:08,560 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:46:08,894 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:46:09,204 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:46:09,523 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:46:09,853 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:46:10,205 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:46:10,541 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:46:10,867 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:46:11,218 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:46:11,567 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:46:11,965 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:46:12,388 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:46:12,801 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:46:13,256 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:46:13,259 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:46:13,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35749819] [2021-05-02 23:46:13,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [35749819] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:46:13,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:46:13,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-02 23:46:13,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579389288] [2021-05-02 23:46:13,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 23:46:13,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:46:13,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 23:46:13,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 23:46:13,260 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:16,501 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:46:16,832 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:46:17,151 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:46:17,494 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:46:17,833 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:46:18,173 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 23:46:18,526 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:46:18,900 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:46:19,252 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:46:19,617 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:46:20,014 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:46:20,404 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:46:20,801 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:46:21,214 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:46:21,644 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:46:22,072 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:46:22,566 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:46:23,030 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:46:23,472 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:46:24,002 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:46:24,526 WARN L205 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:46:25,025 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:46:25,575 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:46:26,054 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 36 [2021-05-02 23:46:26,711 WARN L205 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 40 [2021-05-02 23:46:27,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:46:27,142 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2021-05-02 23:46:27,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 23:46:27,146 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 23:46:27,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:46:27,146 INFO L225 Difference]: With dead ends: 53 [2021-05-02 23:46:27,146 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 23:46:27,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 871 ImplicationChecksByTransitivity, 16940.9ms TimeCoverageRelationStatistics Valid=314, Invalid=5848, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 23:46:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 23:46:27,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 23:46:27,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:27,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-05-02 23:46:27,156 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2021-05-02 23:46:27,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:46:27,156 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-05-02 23:46:27,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:27,156 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-05-02 23:46:27,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:46:27,156 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:46:27,157 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:46:27,157 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-02 23:46:27,157 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:46:27,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:46:27,157 INFO L82 PathProgramCache]: Analyzing trace with hash -59819077, now seen corresponding path program 33 times [2021-05-02 23:46:27,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:46:27,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447470753] [2021-05-02 23:46:27,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:46:27,166 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_630 0)) InVars {main_~x~0=v_main_~x~0_630} OutVars{main_~x~0=v_main_~x~0_630} AuxVars[] AssignedVars[] [2021-05-02 23:46:27,169 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:46:27,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:46:27,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:46:27,238 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:46:27,298 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:46:27,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:27,532 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2021-05-02 23:46:27,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:46:27,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:27,763 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 23:46:27,871 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 15 [2021-05-02 23:46:29,279 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 23:46:29,476 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:46:29,692 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:46:29,928 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:46:30,175 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:46:30,418 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:46:30,710 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:46:30,989 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:46:31,300 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:46:31,622 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:46:31,961 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:46:32,308 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:46:32,698 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:46:33,083 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:46:33,544 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:46:33,981 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:46:34,430 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:46:34,975 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:46:35,496 WARN L205 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:46:36,072 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:46:36,628 WARN L205 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:46:37,180 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:46:37,184 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:46:37,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447470753] [2021-05-02 23:46:37,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1447470753] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:46:37,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:46:37,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-02 23:46:37,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51840408] [2021-05-02 23:46:37,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 23:46:37,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:46:37,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 23:46:37,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1717, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:46:37,185 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:39,002 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:46:39,617 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:46:39,911 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:46:40,251 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:46:40,563 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:46:40,880 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:46:41,178 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:46:41,513 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:46:41,887 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:46:42,289 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:46:42,707 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:46:43,130 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:46:43,564 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:46:44,024 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:46:44,456 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:46:44,920 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:46:45,407 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:46:45,864 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:46:46,374 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:46:46,720 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:46:47,059 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:46:47,394 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:46:47,885 WARN L205 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:46:48,536 WARN L205 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:46:49,132 WARN L205 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:46:49,755 WARN L205 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:46:50,172 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:46:50,532 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:46:50,875 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 37 [2021-05-02 23:46:51,291 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 41 [2021-05-02 23:46:51,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:46:51,663 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2021-05-02 23:46:51,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 23:46:51,665 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 23:46:51,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:46:51,666 INFO L225 Difference]: With dead ends: 54 [2021-05-02 23:46:51,666 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 23:46:51,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 20271.6ms TimeCoverageRelationStatistics Valid=256, Invalid=6224, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:46:51,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 23:46:51,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 23:46:51,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:51,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2021-05-02 23:46:51,675 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2021-05-02 23:46:51,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:46:51,675 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2021-05-02 23:46:51,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:46:51,675 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2021-05-02 23:46:51,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:46:51,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:46:51,676 INFO L523 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:46:51,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-02 23:46:51,676 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:46:51,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:46:51,676 INFO L82 PathProgramCache]: Analyzing trace with hash -329333409, now seen corresponding path program 34 times [2021-05-02 23:46:51,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:46:51,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91227566] [2021-05-02 23:46:51,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:46:51,685 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_666 0)) InVars {main_~x~0=v_main_~x~0_666} OutVars{main_~x~0=v_main_~x~0_666} AuxVars[] AssignedVars[] [2021-05-02 23:46:51,687 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:46:51,719 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:46:51,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:46:51,748 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:46:51,788 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:46:51,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:51,952 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:46:52,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:46:52,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:52,137 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 23:46:54,607 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:46:54,818 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:46:55,023 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:46:55,263 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:46:55,501 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:46:55,754 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:46:55,995 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:46:56,262 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:46:56,574 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:46:56,904 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:46:57,218 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:46:57,586 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:46:57,960 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:46:58,359 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:46:58,361 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:46:58,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91227566] [2021-05-02 23:46:58,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [91227566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:46:58,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:46:58,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-02 23:46:58,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606219754] [2021-05-02 23:46:58,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 23:46:58,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:46:58,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 23:46:58,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1768, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 23:46:58,362 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:01,272 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:47:01,517 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:47:01,775 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:47:02,029 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:47:02,303 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:47:02,598 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:47:02,870 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:47:03,153 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:47:03,456 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:47:03,767 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:47:04,086 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:47:04,433 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:47:04,790 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:47:05,152 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:47:05,500 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:47:05,885 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:47:06,274 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:47:06,715 WARN L205 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:47:07,160 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:47:07,597 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:47:08,008 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:47:08,424 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:47:08,807 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 36 [2021-05-02 23:47:09,254 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 41 [2021-05-02 23:47:09,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:47:09,526 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2021-05-02 23:47:09,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 23:47:09,528 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 23:47:09,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:47:09,529 INFO L225 Difference]: With dead ends: 55 [2021-05-02 23:47:09,529 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 23:47:09,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 14712.9ms TimeCoverageRelationStatistics Valid=329, Invalid=6477, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 23:47:09,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 23:47:09,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 23:47:09,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:09,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2021-05-02 23:47:09,535 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2021-05-02 23:47:09,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:47:09,535 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2021-05-02 23:47:09,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:09,536 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2021-05-02 23:47:09,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:47:09,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:47:09,536 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:47:09,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-02 23:47:09,536 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:47:09,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:47:09,536 INFO L82 PathProgramCache]: Analyzing trace with hash -94343109, now seen corresponding path program 35 times [2021-05-02 23:47:09,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:47:09,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332337312] [2021-05-02 23:47:09,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:47:09,542 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_703 0)) InVars {main_~x~0=v_main_~x~0_703} OutVars{main_~x~0=v_main_~x~0_703} AuxVars[] AssignedVars[] [2021-05-02 23:47:09,556 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:47:09,576 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:47:09,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:47:09,599 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:47:09,632 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:47:09,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:09,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:47:09,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:09,908 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 23:47:11,571 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:47:11,772 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:47:11,992 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:47:12,202 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:47:12,449 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:47:12,728 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:47:12,985 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:47:13,279 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:47:13,603 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:47:13,914 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:47:14,231 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:47:14,569 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:47:14,977 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:47:15,410 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:47:15,823 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:47:16,260 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:47:16,690 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:47:17,207 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:47:17,720 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:47:17,723 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:47:17,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332337312] [2021-05-02 23:47:17,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [332337312] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:47:17,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:47:17,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-02 23:47:17,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623537573] [2021-05-02 23:47:17,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 23:47:17,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:47:17,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 23:47:17,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1887, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:47:17,724 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 41 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:20,195 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:47:20,468 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:47:20,766 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:47:21,060 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:47:21,319 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:47:21,599 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:47:21,922 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:47:22,284 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:47:22,625 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:47:22,967 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:47:23,360 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:47:23,771 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:47:24,176 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:47:24,621 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:47:24,975 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:47:25,436 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:47:25,929 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:47:26,419 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:47:26,847 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:47:27,293 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:47:27,769 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:47:28,294 WARN L205 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:47:28,821 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:47:29,367 WARN L205 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:47:29,837 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:47:30,402 WARN L205 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:47:30,910 WARN L205 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:47:31,364 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 37 [2021-05-02 23:47:31,882 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 41 [2021-05-02 23:47:32,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:47:32,372 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2021-05-02 23:47:32,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 23:47:32,374 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 41 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 23:47:32,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:47:32,375 INFO L225 Difference]: With dead ends: 56 [2021-05-02 23:47:32,375 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:47:32,376 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1073 ImplicationChecksByTransitivity, 18863.9ms TimeCoverageRelationStatistics Valid=268, Invalid=6872, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:47:32,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:47:32,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 23:47:32,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:32,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2021-05-02 23:47:32,382 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2021-05-02 23:47:32,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:47:32,382 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2021-05-02 23:47:32,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 41 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:32,382 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2021-05-02 23:47:32,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 23:47:32,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:47:32,383 INFO L523 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:47:32,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-02 23:47:32,383 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:47:32,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:47:32,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1399578401, now seen corresponding path program 36 times [2021-05-02 23:47:32,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:47:32,383 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285579200] [2021-05-02 23:47:32,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:47:32,390 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_741 0)) InVars {main_~x~0=v_main_~x~0_741} OutVars{main_~x~0=v_main_~x~0_741} AuxVars[] AssignedVars[] [2021-05-02 23:47:32,392 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:47:32,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:47:32,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:47:32,440 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:47:32,481 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:47:32,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:32,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:47:32,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:32,745 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 23:47:34,409 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:47:34,623 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:47:34,859 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:47:35,087 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:47:35,350 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:47:35,659 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:47:35,979 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:47:36,257 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:47:36,563 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:47:36,857 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:47:37,158 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:47:37,465 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:47:37,818 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:47:38,175 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:47:38,589 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:47:39,000 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:47:39,384 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:47:39,745 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:47:40,191 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:47:40,569 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:47:41,054 WARN L205 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:47:41,483 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:47:41,976 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:47:41,978 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:47:41,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285579200] [2021-05-02 23:47:41,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [285579200] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:47:41,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:47:41,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-02 23:47:41,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827176778] [2021-05-02 23:47:41,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 23:47:41,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:47:41,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 23:47:41,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 23:47:41,980 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:44,593 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:47:44,857 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:47:45,134 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:47:45,470 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:47:45,806 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:47:46,172 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:47:46,564 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:47:46,943 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:47:47,355 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:47:47,748 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:47:48,179 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:47:48,668 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:47:49,163 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:47:49,624 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:47:50,036 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:47:50,485 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:47:50,906 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:47:51,360 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:47:51,811 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:47:52,270 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:47:52,746 WARN L205 SmtUtils]: Spent 285.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:47:53,261 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:47:53,734 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:47:54,298 WARN L205 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:47:54,821 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:47:55,433 WARN L205 SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:47:56,074 WARN L205 SmtUtils]: Spent 415.00 ms on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:47:56,787 WARN L205 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2021-05-02 23:47:57,327 WARN L205 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 36 [2021-05-02 23:47:58,019 WARN L205 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 40 [2021-05-02 23:47:58,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:47:58,460 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2021-05-02 23:47:58,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 23:47:58,464 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 23:47:58,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:47:58,465 INFO L225 Difference]: With dead ends: 57 [2021-05-02 23:47:58,465 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 23:47:58,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1049 ImplicationChecksByTransitivity, 21433.1ms TimeCoverageRelationStatistics Valid=346, Invalid=7136, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 23:47:58,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 23:47:58,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 23:47:58,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:58,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-05-02 23:47:58,474 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2021-05-02 23:47:58,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:47:58,474 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-05-02 23:47:58,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:47:58,474 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-05-02 23:47:58,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 23:47:58,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:47:58,474 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:47:58,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-02 23:47:58,475 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:47:58,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:47:58,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1087800507, now seen corresponding path program 37 times [2021-05-02 23:47:58,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:47:58,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684416924] [2021-05-02 23:47:58,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:47:58,487 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_780 0)) InVars {main_~x~0=v_main_~x~0_780} OutVars{main_~x~0=v_main_~x~0_780} AuxVars[] AssignedVars[] [2021-05-02 23:47:58,490 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:47:58,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:47:58,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:47:58,567 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:47:58,626 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:47:58,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:58,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:47:58,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:47:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:47:59,032 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-02 23:48:00,935 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:48:01,149 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:48:01,384 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:48:01,629 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:48:01,889 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:48:02,175 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:48:02,486 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:48:02,802 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:48:03,150 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:48:03,530 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:48:03,923 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:48:04,316 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:48:04,730 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:48:05,129 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:48:05,610 WARN L205 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:48:06,092 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:48:06,621 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:48:07,088 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:48:07,589 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:48:08,125 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:48:08,687 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:48:09,311 WARN L205 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:48:09,881 WARN L205 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:48:09,885 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:48:09,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684416924] [2021-05-02 23:48:09,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1684416924] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:48:09,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:48:09,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-02 23:48:09,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605454109] [2021-05-02 23:48:09,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 23:48:09,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:48:09,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 23:48:09,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:48:09,886 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 43 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:48:12,254 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:48:12,618 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:48:13,014 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:48:13,400 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:48:13,789 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:48:14,229 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:48:14,654 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:48:15,091 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:48:15,608 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:48:16,117 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:48:16,649 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:48:17,160 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:48:17,709 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:48:18,251 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:48:18,874 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:48:19,514 WARN L205 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:48:20,123 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:48:20,825 WARN L205 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:48:21,472 WARN L205 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:48:22,186 WARN L205 SmtUtils]: Spent 436.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:48:22,825 WARN L205 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:48:23,494 WARN L205 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:48:24,316 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:48:25,131 WARN L205 SmtUtils]: Spent 467.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:48:26,049 WARN L205 SmtUtils]: Spent 578.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:48:26,942 WARN L205 SmtUtils]: Spent 562.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:48:27,753 WARN L205 SmtUtils]: Spent 470.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:48:28,840 WARN L205 SmtUtils]: Spent 744.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:48:29,723 WARN L205 SmtUtils]: Spent 522.00 ms on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:48:30,760 WARN L205 SmtUtils]: Spent 674.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2021-05-02 23:48:31,683 WARN L205 SmtUtils]: Spent 611.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2021-05-02 23:48:32,369 WARN L205 SmtUtils]: Spent 435.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 38 [2021-05-02 23:48:33,165 WARN L205 SmtUtils]: Spent 404.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 42 [2021-05-02 23:48:33,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:48:33,717 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2021-05-02 23:48:33,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 23:48:33,723 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 43 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 23:48:33,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:48:33,724 INFO L225 Difference]: With dead ends: 58 [2021-05-02 23:48:33,724 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:48:33,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1096 ImplicationChecksByTransitivity, 28829.5ms TimeCoverageRelationStatistics Valid=354, Invalid=7478, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:48:33,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:48:33,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 23:48:33,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:48:33,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2021-05-02 23:48:33,731 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2021-05-02 23:48:33,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:48:33,731 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2021-05-02 23:48:33,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 43 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:48:33,731 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2021-05-02 23:48:33,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:48:33,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:48:33,732 INFO L523 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:48:33,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-02 23:48:33,732 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:48:33,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:48:33,732 INFO L82 PathProgramCache]: Analyzing trace with hash 887135327, now seen corresponding path program 38 times [2021-05-02 23:48:33,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:48:33,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883768779] [2021-05-02 23:48:33,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:48:33,749 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_820 0)) InVars {main_~x~0=v_main_~x~0_820} OutVars{main_~x~0=v_main_~x~0_820} AuxVars[] AssignedVars[] [2021-05-02 23:48:33,752 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:48:33,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:48:33,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:48:33,843 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:48:33,912 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:48:33,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:48:34,139 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2021-05-02 23:48:34,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:48:34,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:48:34,402 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:48:34,525 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 14 [2021-05-02 23:48:36,051 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-02 23:48:36,268 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:48:36,496 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 23:48:36,751 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 23:48:37,009 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 23:48:37,282 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:48:37,599 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 23:48:37,923 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:48:38,241 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:48:38,602 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:48:38,967 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:48:39,265 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:48:39,584 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:48:39,967 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:48:40,401 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:48:40,879 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:48:41,341 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:48:41,822 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:48:42,350 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:48:42,838 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:48:43,280 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:48:43,810 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:48:44,294 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:48:44,824 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:48:45,428 WARN L205 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:48:46,057 WARN L205 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:48:46,602 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:48:47,191 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:48:47,195 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:48:47,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883768779] [2021-05-02 23:48:47,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [883768779] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:48:47,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:48:47,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-02 23:48:47,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991531185] [2021-05-02 23:48:47,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 23:48:47,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:48:47,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 23:48:47,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2157, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 23:48:47,196 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:48:47,745 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 23:48:49,824 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 23:48:50,180 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 23:48:50,586 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:48:50,966 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 23:48:51,358 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:48:51,755 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:48:52,192 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:48:52,776 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:48:53,364 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:48:53,898 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:48:54,452 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:48:54,917 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:48:55,385 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:48:55,889 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:48:56,433 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:48:56,955 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:48:57,544 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:48:58,098 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:48:58,779 WARN L205 SmtUtils]: Spent 398.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:48:59,520 WARN L205 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:49:00,209 WARN L205 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:49:00,874 WARN L205 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:49:01,474 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:49:02,168 WARN L205 SmtUtils]: Spent 415.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:49:02,856 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:49:03,469 WARN L205 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:49:04,189 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:49:04,820 WARN L205 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-02 23:49:05,573 WARN L205 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2021-05-02 23:49:06,367 WARN L205 SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2021-05-02 23:49:07,174 WARN L205 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2021-05-02 23:49:07,865 WARN L205 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2021-05-02 23:49:08,626 WARN L205 SmtUtils]: Spent 456.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2021-05-02 23:49:09,299 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 37 [2021-05-02 23:49:10,043 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 41 [2021-05-02 23:49:10,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:49:10,798 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2021-05-02 23:49:10,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 23:49:10,803 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 23:49:10,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:49:10,803 INFO L225 Difference]: With dead ends: 59 [2021-05-02 23:49:10,803 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 23:49:10,804 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 30565.6ms TimeCoverageRelationStatistics Valid=286, Invalid=7904, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 23:49:10,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 23:49:10,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 23:49:10,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:49:10,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2021-05-02 23:49:10,813 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2021-05-02 23:49:10,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:49:10,813 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2021-05-02 23:49:10,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:49:10,814 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2021-05-02 23:49:10,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 23:49:10,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:49:10,814 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:49:10,814 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-02 23:49:10,814 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:49:10,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:49:10,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1038517957, now seen corresponding path program 39 times [2021-05-02 23:49:10,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:49:10,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973405618] [2021-05-02 23:49:10,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:49:10,827 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_861 0)) InVars {main_~x~0=v_main_~x~0_861} OutVars{main_~x~0=v_main_~x~0_861} AuxVars[] AssignedVars[] [2021-05-02 23:49:10,830 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:49:10,832 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:49:10,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:49:10,921 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:49:10,992 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:49:10,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:49:11,254 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2021-05-02 23:49:11,383 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 14 [2021-05-02 23:49:11,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:49:11,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:49:11,585 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 23:49:11,761 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 15 [2021-05-02 23:49:12,950 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:49:13,163 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 23:49:13,406 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 23:49:13,673 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 23:49:13,944 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 23:49:14,240 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:49:14,601 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:49:14,993 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:49:15,425 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:49:15,850 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:49:16,293 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:49:16,768 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:49:17,273 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:49:17,758 WARN L205 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:49:18,304 WARN L205 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:49:18,892 WARN L205 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:49:19,642 WARN L205 SmtUtils]: Spent 484.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:49:20,255 WARN L205 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:49:20,996 WARN L205 SmtUtils]: Spent 463.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:49:21,635 WARN L205 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:49:22,310 WARN L205 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:49:23,137 WARN L205 SmtUtils]: Spent 521.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:49:23,850 WARN L205 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:49:24,588 WARN L205 SmtUtils]: Spent 489.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:49:25,492 WARN L205 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:49:26,347 WARN L205 SmtUtils]: Spent 517.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:49:27,356 WARN L205 SmtUtils]: Spent 684.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:49:28,327 WARN L205 SmtUtils]: Spent 604.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:49:29,297 WARN L205 SmtUtils]: Spent 595.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:49:30,243 WARN L205 SmtUtils]: Spent 564.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:49:31,190 WARN L205 SmtUtils]: Spent 547.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:49:32,228 WARN L205 SmtUtils]: Spent 658.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:49:32,234 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:49:32,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973405618] [2021-05-02 23:49:32,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1973405618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:49:32,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:49:32,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-02 23:49:32,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101624077] [2021-05-02 23:49:32,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 23:49:32,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:49:32,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 23:49:32,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2251, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:49:32,235 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 45 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:49:33,112 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 23:49:34,462 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:49:34,901 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:49:35,359 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:49:35,843 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:49:36,456 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:49:36,951 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:49:37,556 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:49:38,087 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:49:38,680 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:49:39,274 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:49:39,882 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:49:40,637 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:49:41,334 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:49:41,997 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:49:42,742 WARN L205 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:49:43,448 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:49:44,253 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:49:45,057 WARN L205 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:49:45,906 WARN L205 SmtUtils]: Spent 476.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:49:46,776 WARN L205 SmtUtils]: Spent 477.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:49:47,563 WARN L205 SmtUtils]: Spent 368.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:49:48,569 WARN L205 SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:49:49,481 WARN L205 SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:49:50,462 WARN L205 SmtUtils]: Spent 554.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:49:51,565 WARN L205 SmtUtils]: Spent 602.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:49:52,553 WARN L205 SmtUtils]: Spent 531.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:49:53,735 WARN L205 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:49:54,910 WARN L205 SmtUtils]: Spent 693.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:49:55,841 WARN L205 SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:49:56,913 WARN L205 SmtUtils]: Spent 624.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:49:58,005 WARN L205 SmtUtils]: Spent 675.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:49:59,444 WARN L205 SmtUtils]: Spent 962.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:50:00,506 WARN L205 SmtUtils]: Spent 594.00 ms on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:50:01,656 WARN L205 SmtUtils]: Spent 789.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2021-05-02 23:50:02,751 WARN L205 SmtUtils]: Spent 728.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2021-05-02 23:50:03,849 WARN L205 SmtUtils]: Spent 800.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2021-05-02 23:50:05,010 WARN L205 SmtUtils]: Spent 827.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2021-05-02 23:50:05,855 WARN L205 SmtUtils]: Spent 532.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 37 [2021-05-02 23:50:06,884 WARN L205 SmtUtils]: Spent 529.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 41 [2021-05-02 23:50:07,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:50:07,840 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2021-05-02 23:50:07,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 23:50:07,846 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 45 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 23:50:07,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:50:07,847 INFO L225 Difference]: With dead ends: 60 [2021-05-02 23:50:07,847 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 23:50:07,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1271 ImplicationChecksByTransitivity, 46943.4ms TimeCoverageRelationStatistics Valid=292, Invalid=8264, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:50:07,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 23:50:07,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 23:50:07,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:50:07,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2021-05-02 23:50:07,856 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2021-05-02 23:50:07,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:50:07,856 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2021-05-02 23:50:07,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 45 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:50:07,856 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2021-05-02 23:50:07,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 23:50:07,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:50:07,856 INFO L523 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:50:07,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-02 23:50:07,857 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:50:07,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:50:07,857 INFO L82 PathProgramCache]: Analyzing trace with hash -604227617, now seen corresponding path program 40 times [2021-05-02 23:50:07,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:50:07,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806187210] [2021-05-02 23:50:07,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:50:07,877 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_903 0)) InVars {main_~x~0=v_main_~x~0_903} OutVars{main_~x~0=v_main_~x~0_903} AuxVars[] AssignedVars[] [2021-05-02 23:50:07,881 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:50:07,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:50:07,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:50:07,975 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:50:08,065 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:50:08,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:50:08,359 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2021-05-02 23:50:08,486 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-02 23:50:08,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:50:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:50:08,675 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 23:50:08,837 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-02 23:50:09,971 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 23:50:10,382 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 23:50:10,603 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 23:50:10,838 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 23:50:11,104 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 23:50:11,371 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:50:11,652 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 23:50:12,037 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 23:50:12,455 WARN L205 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 23:50:12,809 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 23:50:13,181 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 23:50:13,579 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 23:50:14,015 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 23:50:14,430 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2021-05-02 23:50:14,860 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 23:50:15,454 WARN L205 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 23:50:16,092 WARN L205 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 23:50:16,887 WARN L205 SmtUtils]: Spent 567.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2021-05-02 23:50:17,529 WARN L205 SmtUtils]: Spent 406.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2021-05-02 23:50:18,111 WARN L205 SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2021-05-02 23:50:19,032 WARN L205 SmtUtils]: Spent 679.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2021-05-02 23:50:19,839 WARN L205 SmtUtils]: Spent 557.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2021-05-02 23:50:20,501 WARN L205 SmtUtils]: Spent 427.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2021-05-02 23:50:21,321 WARN L205 SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2021-05-02 23:50:21,908 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 111 [2021-05-02 23:50:22,838 WARN L205 SmtUtils]: Spent 657.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2021-05-02 23:50:23,788 WARN L205 SmtUtils]: Spent 661.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2021-05-02 23:50:24,687 WARN L205 SmtUtils]: Spent 650.00 ms on a formula simplification that was a NOOP. DAG size: 120 [2021-05-02 23:50:25,409 WARN L205 SmtUtils]: Spent 459.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2021-05-02 23:50:26,208 WARN L205 SmtUtils]: Spent 534.00 ms on a formula simplification that was a NOOP. DAG size: 126 [2021-05-02 23:50:27,045 WARN L205 SmtUtils]: Spent 561.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:50:28,425 WARN L205 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 132 [2021-05-02 23:50:28,432 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:50:28,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806187210] [2021-05-02 23:50:28,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [806187210] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:50:28,432 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:50:28,432 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-02 23:50:28,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59655444] [2021-05-02 23:50:28,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 23:50:28,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:50:28,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 23:50:28,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2347, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 23:50:28,433 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:50:29,314 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 23:50:30,160 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-02 23:50:30,636 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 23:50:31,057 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 23:50:31,480 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 23:50:31,885 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:50:32,396 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 23:50:32,959 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 23:50:33,571 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 23:50:34,200 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 23:50:34,853 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 23:50:35,538 WARN L205 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 23:50:36,234 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 23:50:36,934 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2021-05-02 23:50:37,829 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 23:50:38,635 WARN L205 SmtUtils]: Spent 413.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 23:50:39,555 WARN L205 SmtUtils]: Spent 449.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 23:50:40,348 WARN L205 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2021-05-02 23:50:41,302 WARN L205 SmtUtils]: Spent 474.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2021-05-02 23:50:42,091 WARN L205 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2021-05-02 23:50:43,020 WARN L205 SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2021-05-02 23:50:43,948 WARN L205 SmtUtils]: Spent 529.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2021-05-02 23:50:44,856 WARN L205 SmtUtils]: Spent 468.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2021-05-02 23:50:45,928 WARN L205 SmtUtils]: Spent 675.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2021-05-02 23:50:47,009 WARN L205 SmtUtils]: Spent 597.00 ms on a formula simplification that was a NOOP. DAG size: 111 [2021-05-02 23:50:48,265 WARN L205 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2021-05-02 23:50:49,346 WARN L205 SmtUtils]: Spent 650.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2021-05-02 23:50:50,420 WARN L205 SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 120 [2021-05-02 23:50:51,768 WARN L205 SmtUtils]: Spent 850.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2021-05-02 23:50:53,049 WARN L205 SmtUtils]: Spent 891.00 ms on a formula simplification that was a NOOP. DAG size: 126 [2021-05-02 23:50:54,218 WARN L205 SmtUtils]: Spent 644.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:50:55,391 WARN L205 SmtUtils]: Spent 743.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2021-05-02 23:50:56,498 WARN L205 SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2021-05-02 23:50:58,129 WARN L205 SmtUtils]: Spent 1.21 s on a formula simplification that was a NOOP. DAG size: 138 [2021-05-02 23:50:59,715 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 141 [2021-05-02 23:51:01,280 WARN L205 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 144 [2021-05-02 23:51:02,565 WARN L205 SmtUtils]: Spent 772.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2021-05-02 23:51:04,303 WARN L205 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 150 [2021-05-02 23:51:06,097 WARN L205 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 153 [2021-05-02 23:51:07,955 WARN L205 SmtUtils]: Spent 1.42 s on a formula simplification that was a NOOP. DAG size: 156 [2021-05-02 23:51:09,048 WARN L205 SmtUtils]: Spent 645.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 37 [2021-05-02 23:51:10,281 WARN L205 SmtUtils]: Spent 744.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 41 [2021-05-02 23:51:11,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:51:11,324 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2021-05-02 23:51:11,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 23:51:11,331 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 23:51:11,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:51:11,332 INFO L225 Difference]: With dead ends: 61 [2021-05-02 23:51:11,332 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 23:51:11,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1323 ImplicationChecksByTransitivity, 51648.0ms TimeCoverageRelationStatistics Valid=298, Invalid=8632, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 23:51:11,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 23:51:11,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 23:51:11,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:51:11,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2021-05-02 23:51:11,344 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2021-05-02 23:51:11,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:51:11,344 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2021-05-02 23:51:11,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:51:11,345 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2021-05-02 23:51:11,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 23:51:11,345 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:51:11,345 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:51:11,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-02 23:51:11,346 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:51:11,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:51:11,346 INFO L82 PathProgramCache]: Analyzing trace with hash -26128965, now seen corresponding path program 41 times [2021-05-02 23:51:11,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:51:11,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521135692] [2021-05-02 23:51:11,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:51:11,361 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_946 0)) InVars {main_~x~0=v_main_~x~0_946} OutVars{main_~x~0=v_main_~x~0_946} AuxVars[] AssignedVars[] [2021-05-02 23:51:11,365 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:51:11,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:51:11,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:51:11,487 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:51:11,585 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:51:11,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:51:11,844 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2021-05-02 23:51:12,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:51:12,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:51:12,124 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 23:51:12,404 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-02 23:51:12,608 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-05-02 23:51:12,897 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 15 [2021-05-02 23:51:13,583 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 23:51:13,844 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-02 23:51:14,131 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 23:51:14,449 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:51:14,768 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 23:51:15,103 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 23:51:15,475 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 23:51:15,877 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 23:51:16,327 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 23:51:16,864 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:51:17,375 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 23:51:17,941 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:51:18,554 WARN L205 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:51:19,203 WARN L205 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:51:19,899 WARN L205 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:51:20,481 WARN L205 SmtUtils]: Spent 334.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:51:21,104 WARN L205 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:51:21,724 WARN L205 SmtUtils]: Spent 380.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:51:22,281 WARN L205 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:51:22,988 WARN L205 SmtUtils]: Spent 423.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:51:23,782 WARN L205 SmtUtils]: Spent 505.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:51:24,630 WARN L205 SmtUtils]: Spent 537.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:51:25,369 WARN L205 SmtUtils]: Spent 427.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:51:26,129 WARN L205 SmtUtils]: Spent 450.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:51:26,988 WARN L205 SmtUtils]: Spent 516.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:51:27,978 WARN L205 SmtUtils]: Spent 627.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:51:28,816 WARN L205 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:51:29,875 WARN L205 SmtUtils]: Spent 694.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:51:30,801 WARN L205 SmtUtils]: Spent 536.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:51:31,916 WARN L205 SmtUtils]: Spent 704.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:51:33,355 WARN L205 SmtUtils]: Spent 913.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:51:35,117 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:51:36,531 WARN L205 SmtUtils]: Spent 832.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:51:37,763 WARN L205 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:51:39,342 WARN L205 SmtUtils]: Spent 992.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:51:41,785 WARN L205 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:51:43,609 WARN L205 SmtUtils]: Spent 1.15 s on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:51:43,618 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:51:43,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521135692] [2021-05-02 23:51:43,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1521135692] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:51:43,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:51:43,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-02 23:51:43,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549192029] [2021-05-02 23:51:43,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 23:51:43,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:51:43,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 23:51:43,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:51:43,621 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 47 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:51:44,858 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:51:45,400 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 23:51:45,979 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 23:51:46,487 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 23:51:47,069 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 23:51:47,538 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:51:48,074 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:51:48,680 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:51:49,232 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:51:49,910 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:51:50,453 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:51:51,009 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:51:51,650 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 23:51:52,292 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:51:53,086 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:51:53,769 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 23:51:54,604 WARN L205 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:51:55,373 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:51:56,126 WARN L205 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:51:56,896 WARN L205 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:51:57,801 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:51:58,696 WARN L205 SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:51:59,689 WARN L205 SmtUtils]: Spent 504.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:52:00,641 WARN L205 SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:52:01,658 WARN L205 SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:52:02,779 WARN L205 SmtUtils]: Spent 628.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:52:04,190 WARN L205 SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:52:05,477 WARN L205 SmtUtils]: Spent 641.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:52:06,795 WARN L205 SmtUtils]: Spent 784.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:52:08,222 WARN L205 SmtUtils]: Spent 874.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:52:09,989 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:52:11,551 WARN L205 SmtUtils]: Spent 889.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:52:12,842 WARN L205 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:52:13,996 WARN L205 SmtUtils]: Spent 686.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:52:15,298 WARN L205 SmtUtils]: Spent 766.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:52:16,616 WARN L205 SmtUtils]: Spent 798.00 ms on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:52:18,366 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 143 [2021-05-02 23:52:20,026 WARN L205 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 146 [2021-05-02 23:52:21,866 WARN L205 SmtUtils]: Spent 1.27 s on a formula simplification that was a NOOP. DAG size: 149 [2021-05-02 23:52:23,438 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 152 [2021-05-02 23:52:25,587 WARN L205 SmtUtils]: Spent 1.54 s on a formula simplification that was a NOOP. DAG size: 155 [2021-05-02 23:52:27,638 WARN L205 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 158 [2021-05-02 23:52:28,986 WARN L205 SmtUtils]: Spent 812.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 37 [2021-05-02 23:52:30,533 WARN L205 SmtUtils]: Spent 863.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 42 [2021-05-02 23:52:31,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:52:31,626 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2021-05-02 23:52:31,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 23:52:31,635 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 47 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 23:52:31,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:52:31,636 INFO L225 Difference]: With dead ends: 62 [2021-05-02 23:52:31,636 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 23:52:31,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1294 ImplicationChecksByTransitivity, 66987.5ms TimeCoverageRelationStatistics Valid=386, Invalid=8926, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:52:31,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 23:52:31,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 23:52:31,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:52:31,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2021-05-02 23:52:31,644 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2021-05-02 23:52:31,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:52:31,644 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2021-05-02 23:52:31,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 47 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:52:31,644 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2021-05-02 23:52:31,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:52:31,645 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:52:31,645 INFO L523 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:52:31,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-02 23:52:31,645 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:52:31,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:52:31,645 INFO L82 PathProgramCache]: Analyzing trace with hash 715060063, now seen corresponding path program 42 times [2021-05-02 23:52:31,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:52:31,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851858480] [2021-05-02 23:52:31,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:52:31,664 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_990 0)) InVars {main_~x~0=v_main_~x~0_990} OutVars{main_~x~0=v_main_~x~0_990} AuxVars[] AssignedVars[] [2021-05-02 23:52:31,669 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:52:31,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:52:31,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:52:31,826 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:52:31,962 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 23:52:31,973 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:52:31,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:52:32,329 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2021-05-02 23:52:32,549 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-02 23:52:32,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:52:32,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:52:32,866 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 23:52:33,121 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:52:33,321 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2021-05-02 23:52:34,221 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-02 23:52:34,466 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2021-05-02 23:52:34,740 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2021-05-02 23:52:35,055 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:52:35,407 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-02 23:52:35,795 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:52:36,238 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-02 23:52:36,696 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:52:37,170 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 23:52:37,632 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 23:52:38,063 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 23:52:38,593 WARN L205 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:52:39,151 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 23:52:39,633 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:52:40,185 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:52:40,749 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:52:41,252 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:52:41,853 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:52:42,444 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:52:43,229 WARN L205 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:52:43,999 WARN L205 SmtUtils]: Spent 440.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:52:44,760 WARN L205 SmtUtils]: Spent 430.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:52:45,490 WARN L205 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:52:46,206 WARN L205 SmtUtils]: Spent 352.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:52:47,064 WARN L205 SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:52:47,857 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:52:48,920 WARN L205 SmtUtils]: Spent 676.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:52:49,967 WARN L205 SmtUtils]: Spent 626.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:52:51,137 WARN L205 SmtUtils]: Spent 591.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:52:52,545 WARN L205 SmtUtils]: Spent 878.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:52:53,985 WARN L205 SmtUtils]: Spent 873.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:52:55,517 WARN L205 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:52:56,741 WARN L205 SmtUtils]: Spent 611.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:52:58,070 WARN L205 SmtUtils]: Spent 697.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:52:59,469 WARN L205 SmtUtils]: Spent 761.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:53:01,031 WARN L205 SmtUtils]: Spent 877.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:53:02,370 WARN L205 SmtUtils]: Spent 690.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-02 23:53:04,263 WARN L205 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 136 [2021-05-02 23:53:04,274 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:53:04,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851858480] [2021-05-02 23:53:04,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1851858480] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:53:04,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:53:04,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-02 23:53:04,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361035316] [2021-05-02 23:53:04,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 23:53:04,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:53:04,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 23:53:04,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 23:53:04,276 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:53:05,819 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:53:06,592 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-02 23:53:07,426 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:53:08,253 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-02 23:53:09,103 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:53:09,979 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 23:53:10,887 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 23:53:11,753 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 23:53:12,632 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:53:13,532 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 23:53:14,488 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 23:53:15,509 WARN L205 SmtUtils]: Spent 358.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 23:53:16,480 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 23:53:17,517 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 23:53:18,629 WARN L205 SmtUtils]: Spent 455.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 23:53:19,763 WARN L205 SmtUtils]: Spent 423.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2021-05-02 23:53:20,873 WARN L205 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2021-05-02 23:53:21,963 WARN L205 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2021-05-02 23:53:23,141 WARN L205 SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-02 23:53:24,250 WARN L205 SmtUtils]: Spent 470.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2021-05-02 23:53:25,729 WARN L205 SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2021-05-02 23:53:26,910 WARN L205 SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2021-05-02 23:53:28,117 WARN L205 SmtUtils]: Spent 553.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2021-05-02 23:53:29,307 WARN L205 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2021-05-02 23:53:30,838 WARN L205 SmtUtils]: Spent 813.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2021-05-02 23:53:32,286 WARN L205 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2021-05-02 23:53:33,743 WARN L205 SmtUtils]: Spent 815.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2021-05-02 23:53:35,151 WARN L205 SmtUtils]: Spent 734.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2021-05-02 23:53:36,465 WARN L205 SmtUtils]: Spent 633.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2021-05-02 23:53:38,143 WARN L205 SmtUtils]: Spent 979.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2021-05-02 23:53:39,884 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 124 [2021-05-02 23:53:41,605 WARN L205 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 127 [2021-05-02 23:53:43,309 WARN L205 SmtUtils]: Spent 988.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2021-05-02 23:53:44,812 WARN L205 SmtUtils]: Spent 803.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2021-05-02 23:53:46,750 WARN L205 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 136 [2021-05-02 23:53:48,592 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 139 [2021-05-02 23:53:50,578 WARN L205 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 142 [2021-05-02 23:53:52,098 WARN L205 SmtUtils]: Spent 815.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2021-05-02 23:53:53,937 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 148 [2021-05-02 23:53:56,144 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 151 [2021-05-02 23:53:58,161 WARN L205 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 154 [2021-05-02 23:54:00,222 WARN L205 SmtUtils]: Spent 1.34 s on a formula simplification that was a NOOP. DAG size: 157 [2021-05-02 23:54:02,027 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 160 [2021-05-02 23:54:03,908 WARN L205 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 177 DAG size of output: 38 [2021-05-02 23:54:05,831 WARN L205 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 173 DAG size of output: 42 [2021-05-02 23:54:06,426 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 23:54:07,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:54:07,033 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2021-05-02 23:54:07,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 23:54:07,044 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 23:54:07,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:54:07,044 INFO L225 Difference]: With dead ends: 63 [2021-05-02 23:54:07,044 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 23:54:07,045 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1346 ImplicationChecksByTransitivity, 78853.1ms TimeCoverageRelationStatistics Valid=394, Invalid=9308, Unknown=0, NotChecked=0, Total=9702 [2021-05-02 23:54:07,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 23:54:07,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-02 23:54:07,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:54:07,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2021-05-02 23:54:07,054 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2021-05-02 23:54:07,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:54:07,054 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2021-05-02 23:54:07,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:54:07,054 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2021-05-02 23:54:07,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 23:54:07,055 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:54:07,055 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:54:07,055 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-02 23:54:07,055 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:54:07,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:54:07,055 INFO L82 PathProgramCache]: Analyzing trace with hash -2077883845, now seen corresponding path program 43 times [2021-05-02 23:54:07,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:54:07,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965865786] [2021-05-02 23:54:07,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:54:07,076 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_1035 0)) InVars {main_~x~0=v_main_~x~0_1035} OutVars{main_~x~0=v_main_~x~0_1035} AuxVars[] AssignedVars[] [2021-05-02 23:54:07,083 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:54:07,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:54:07,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:54:07,273 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:54:07,427 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 23:54:07,437 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:54:07,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:54:07,945 WARN L205 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 20 [2021-05-02 23:54:08,228 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 14 [2021-05-02 23:54:08,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:54:08,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:54:08,621 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 23:54:08,935 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-02 23:54:09,172 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-05-02 23:54:09,500 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 15 [2021-05-02 23:54:10,062 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 23:54:10,323 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-05-02 23:54:10,557 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:54:10,857 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 23:54:11,181 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:54:11,489 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 23:54:11,852 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 23:54:12,276 WARN L205 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-02 23:54:12,732 WARN L205 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-02 23:54:13,207 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:54:13,756 WARN L205 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 23:54:14,389 WARN L205 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:54:15,068 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:54:15,679 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:54:16,403 WARN L205 SmtUtils]: Spent 452.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:54:17,144 WARN L205 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:54:17,826 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:54:18,777 WARN L205 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:54:19,674 WARN L205 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:54:20,539 WARN L205 SmtUtils]: Spent 509.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:54:21,410 WARN L205 SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:54:22,420 WARN L205 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:54:23,556 WARN L205 SmtUtils]: Spent 735.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:54:24,682 WARN L205 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:54:25,851 WARN L205 SmtUtils]: Spent 693.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:54:27,274 WARN L205 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:54:28,376 WARN L205 SmtUtils]: Spent 613.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:54:29,960 WARN L205 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:54:31,141 WARN L205 SmtUtils]: Spent 689.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:54:32,198 WARN L205 SmtUtils]: Spent 638.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:54:33,545 WARN L205 SmtUtils]: Spent 907.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:54:35,058 WARN L205 SmtUtils]: Spent 972.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:54:36,633 WARN L205 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:54:38,084 WARN L205 SmtUtils]: Spent 894.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:54:39,692 WARN L205 SmtUtils]: Spent 998.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:54:41,406 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:54:44,013 WARN L205 SmtUtils]: Spent 1.97 s on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:54:45,708 WARN L205 SmtUtils]: Spent 1.03 s on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:54:47,445 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:54:50,387 WARN L205 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:54:50,408 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:54:50,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965865786] [2021-05-02 23:54:50,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1965865786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:54:50,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:54:50,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-02 23:54:50,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390641935] [2021-05-02 23:54:50,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 23:54:50,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:54:50,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 23:54:50,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2605, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:54:50,410 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 49 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:54:52,168 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:54:52,894 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 23:54:53,744 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 23:54:54,445 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:54:55,266 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 23:54:56,056 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:54:56,834 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 23:54:57,864 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 23:54:58,723 WARN L205 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 23:54:59,909 WARN L205 SmtUtils]: Spent 364.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 23:55:00,934 WARN L205 SmtUtils]: Spent 438.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 23:55:02,037 WARN L205 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 23:55:03,116 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 23:55:04,213 WARN L205 SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 23:55:05,611 WARN L205 SmtUtils]: Spent 544.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-02 23:55:07,002 WARN L205 SmtUtils]: Spent 550.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2021-05-02 23:55:08,400 WARN L205 SmtUtils]: Spent 605.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2021-05-02 23:55:09,964 WARN L205 SmtUtils]: Spent 730.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-02 23:55:11,443 WARN L205 SmtUtils]: Spent 642.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2021-05-02 23:55:13,023 WARN L205 SmtUtils]: Spent 720.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2021-05-02 23:55:14,642 WARN L205 SmtUtils]: Spent 793.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2021-05-02 23:55:16,203 WARN L205 SmtUtils]: Spent 679.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2021-05-02 23:55:17,840 WARN L205 SmtUtils]: Spent 727.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2021-05-02 23:55:19,456 WARN L205 SmtUtils]: Spent 763.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2021-05-02 23:55:21,554 WARN L205 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 107 [2021-05-02 23:55:23,139 WARN L205 SmtUtils]: Spent 799.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2021-05-02 23:55:25,276 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 113 [2021-05-02 23:55:26,901 WARN L205 SmtUtils]: Spent 852.00 ms on a formula simplification that was a NOOP. DAG size: 116 [2021-05-02 23:55:28,693 WARN L205 SmtUtils]: Spent 909.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2021-05-02 23:55:30,875 WARN L205 SmtUtils]: Spent 1.28 s on a formula simplification that was a NOOP. DAG size: 122 [2021-05-02 23:55:32,949 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 125 [2021-05-02 23:55:35,364 WARN L205 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 128 [2021-05-02 23:55:37,829 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 131 [2021-05-02 23:55:40,034 WARN L205 SmtUtils]: Spent 1.30 s on a formula simplification that was a NOOP. DAG size: 134 [2021-05-02 23:55:42,963 WARN L205 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 137 [2021-05-02 23:55:45,241 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 140 [2021-05-02 23:55:47,657 WARN L205 SmtUtils]: Spent 1.54 s on a formula simplification that was a NOOP. DAG size: 143 [2021-05-02 23:55:50,127 WARN L205 SmtUtils]: Spent 1.42 s on a formula simplification that was a NOOP. DAG size: 146 [2021-05-02 23:55:52,489 WARN L205 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 149 [2021-05-02 23:55:54,673 WARN L205 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 152 [2021-05-02 23:55:57,511 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 155 [2021-05-02 23:56:00,431 WARN L205 SmtUtils]: Spent 1.91 s on a formula simplification that was a NOOP. DAG size: 158 [2021-05-02 23:56:02,919 WARN L205 SmtUtils]: Spent 1.80 s on a formula simplification that was a NOOP. DAG size: 161 [2021-05-02 23:56:06,263 WARN L205 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 164 [2021-05-02 23:56:08,293 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification. DAG size of input: 181 DAG size of output: 36 [2021-05-02 23:56:10,257 WARN L205 SmtUtils]: Spent 887.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 41 [2021-05-02 23:56:11,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:56:11,469 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2021-05-02 23:56:11,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 23:56:11,479 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.04) internal successors, (52), 49 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 23:56:11,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:56:11,481 INFO L225 Difference]: With dead ends: 64 [2021-05-02 23:56:11,481 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 23:56:11,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1394 ImplicationChecksByTransitivity, 102280.7ms TimeCoverageRelationStatistics Valid=401, Invalid=9699, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 23:56:11,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 23:56:11,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 23:56:11,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:56:11,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2021-05-02 23:56:11,495 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2021-05-02 23:56:11,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:56:11,495 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2021-05-02 23:56:11,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 50 states have (on average 1.04) internal successors, (52), 49 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:56:11,496 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2021-05-02 23:56:11,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 23:56:11,496 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:56:11,496 INFO L523 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:56:11,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-02 23:56:11,496 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:56:11,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:56:11,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1535168223, now seen corresponding path program 44 times [2021-05-02 23:56:11,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:56:11,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229702389] [2021-05-02 23:56:11,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:56:11,519 INFO L181 rdanLoopAcceleration]: Guard: Formula: (not (= v_main_~x~0_1081 0)) InVars {main_~x~0=v_main_~x~0_1081} OutVars{main_~x~0=v_main_~x~0_1081} AuxVars[] AssignedVars[] [2021-05-02 23:56:11,524 WARN L240 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size [2021-05-02 23:56:11,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:56:11,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-02 23:56:11,685 WARN L245 tifierPushTermWalker]: treesize reduction 14, result has 80.0 percent of original size 56 [2021-05-02 23:56:11,833 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2021-05-02 23:56:11,842 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:56:11,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:56:12,198 WARN L205 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 11 [2021-05-02 23:56:12,612 WARN L205 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 22 [2021-05-02 23:56:12,984 WARN L205 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2021-05-02 23:56:13,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:56:13,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:56:13,325 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 23:56:13,748 WARN L205 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2021-05-02 23:56:14,015 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2021-05-02 23:56:14,306 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2021-05-02 23:56:15,031 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 23:56:15,260 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-02 23:56:15,542 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-05-02 23:56:15,843 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:56:16,152 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 23:56:16,555 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-02 23:56:16,964 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 23:56:17,428 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 23:56:17,891 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 23:56:18,385 WARN L205 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 23:56:18,915 WARN L205 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:56:19,484 WARN L205 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 23:56:20,124 WARN L205 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 23:56:20,751 WARN L205 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 23:56:21,363 WARN L205 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 23:56:22,037 WARN L205 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 23:56:22,747 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 23:56:23,454 WARN L205 SmtUtils]: Spent 447.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 23:56:24,228 WARN L205 SmtUtils]: Spent 506.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2021-05-02 23:56:25,248 WARN L205 SmtUtils]: Spent 745.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 23:56:26,069 WARN L205 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 23:56:27,045 WARN L205 SmtUtils]: Spent 685.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 23:56:27,938 WARN L205 SmtUtils]: Spent 611.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2021-05-02 23:56:28,898 WARN L205 SmtUtils]: Spent 668.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2021-05-02 23:56:30,042 WARN L205 SmtUtils]: Spent 827.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2021-05-02 23:56:31,366 WARN L205 SmtUtils]: Spent 984.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2021-05-02 23:56:32,466 WARN L205 SmtUtils]: Spent 775.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2021-05-02 23:56:33,660 WARN L205 SmtUtils]: Spent 856.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2021-05-02 23:56:35,192 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 108 [2021-05-02 23:56:36,712 WARN L205 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 111 [2021-05-02 23:56:37,796 WARN L205 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2021-05-02 23:56:39,173 WARN L205 SmtUtils]: Spent 977.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2021-05-02 23:56:40,838 WARN L205 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 120 [2021-05-02 23:56:42,823 WARN L205 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 123 [2021-05-02 23:56:44,544 WARN L205 SmtUtils]: Spent 1.28 s on a formula simplification that was a NOOP. DAG size: 126 [2021-05-02 23:56:46,702 WARN L205 SmtUtils]: Spent 1.72 s on a formula simplification that was a NOOP. DAG size: 129 [2021-05-02 23:56:48,684 WARN L205 SmtUtils]: Spent 1.55 s on a formula simplification that was a NOOP. DAG size: 132 [2021-05-02 23:56:51,067 WARN L205 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 135 [2021-05-02 23:56:53,157 WARN L205 SmtUtils]: Spent 1.62 s on a formula simplification that was a NOOP. DAG size: 138 [2021-05-02 23:56:55,200 WARN L205 SmtUtils]: Spent 1.58 s on a formula simplification that was a NOOP. DAG size: 141 [2021-05-02 23:56:55,210 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:56:55,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229702389] [2021-05-02 23:56:55,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [229702389] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:56:55,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:56:55,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-02 23:56:55,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060474915] [2021-05-02 23:56:55,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 23:56:55,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:56:55,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 23:56:55,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2753, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 23:56:55,212 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 50 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:56:56,867 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 23:56:57,585 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 23:56:58,284 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:56:59,085 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 23:56:59,758 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 23:57:00,565 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 23:57:01,410 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 23:57:02,282 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:57:03,317 WARN L205 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 23:57:04,174 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 23:57:05,117 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 23:57:06,164 WARN L205 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 23:57:07,112 WARN L205 SmtUtils]: Spent 408.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 23:57:08,148 WARN L205 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 23:57:09,346 WARN L205 SmtUtils]: Spent 492.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 23:57:10,587 WARN L205 SmtUtils]: Spent 466.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2021-05-02 23:57:11,694 WARN L205 SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-02 23:57:12,813 WARN L205 SmtUtils]: Spent 499.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2021-05-02 23:57:13,960 WARN L205 SmtUtils]: Spent 575.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2021-05-02 23:57:15,716 WARN L205 SmtUtils]: Spent 874.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2021-05-02 23:57:17,651 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 93