/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/linear_sea.ch.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:49:51,626 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:49:51,628 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:49:51,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 11:49:51,658 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 11:49:51,661 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 11:49:51,663 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 11:49:51,666 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 11:49:51,668 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 11:49:51,671 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 11:49:51,672 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 11:49:51,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 11:49:51,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:49:51,674 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:49:51,675 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:49:51,677 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:49:51,678 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:49:51,679 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:49:51,680 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:49:51,684 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:49:51,685 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:49:51,687 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:49:51,688 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:49:51,689 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:49:51,694 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 11:49:51,694 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 11:49:51,694 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 11:49:51,695 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 11:49:51,695 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 11:49:51,696 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 11:49:51,696 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 11:49:51,697 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 11:49:51,698 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 11:49:51,698 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 11:49:51,699 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 11:49:51,699 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 11:49:51,699 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 11:49:51,699 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 11:49:51,700 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:49:51,700 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:49:51,701 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:49:51,704 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 11:49:51,730 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:49:51,731 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:49:51,733 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:49:51,733 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:49:51,733 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:49:51,733 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:49:51,733 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:49:51,733 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:49:51,734 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:49:51,734 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:49:51,734 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:49:51,734 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:49:51,735 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:49:51,735 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:51,736 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:49:51,736 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:49:52,057 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:49:52,073 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:49:52,074 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:49:52,075 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:49:52,076 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:49:52,076 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/linear_sea.ch.c [2021-05-02 11:49:52,153 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f824279a/8a4c5932e20245c58fbe7ba242553ad6/FLAGe0f629bfb [2021-05-02 11:49:52,505 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:49:52,506 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c [2021-05-02 11:49:52,510 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f824279a/8a4c5932e20245c58fbe7ba242553ad6/FLAGe0f629bfb [2021-05-02 11:49:52,915 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f824279a/8a4c5932e20245c58fbe7ba242553ad6 [2021-05-02 11:49:52,916 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:49:52,918 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:49:52,921 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:52,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:49:52,924 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:49:52,925 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@332388f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52, skipping insertion in model container [2021-05-02 11:49:52,926 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,930 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:49:52,940 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:49:53,027 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c[358,371] [2021-05-02 11:49:53,039 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:53,045 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:49:53,052 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/linear_sea.ch.c[358,371] [2021-05-02 11:49:53,056 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:53,091 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:49:53,091 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53 WrapperNode [2021-05-02 11:49:53,092 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:53,094 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:49:53,094 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:49:53,094 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:49:53,115 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,119 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,120 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,123 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,126 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,126 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (1/1) ... [2021-05-02 11:49:53,127 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:49:53,128 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:49:53,128 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:49:53,128 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:49:53,129 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (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 11:49:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:49:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:49:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:49:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:49:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure linear_search [2021-05-02 11:49:53,181 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure linear_search [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:49:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-05-02 11:49:53,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:49:53,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:49:53,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:49:53,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:49:53,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:49:53,395 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:49:53,396 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:49:53,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:53 BoogieIcfgContainer [2021-05-02 11:49:53,397 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:49:53,398 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:49:53,398 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:49:53,400 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:49:53,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:49:52" (1/3) ... [2021-05-02 11:49:53,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2426d5c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:53, skipping insertion in model container [2021-05-02 11:49:53,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:53" (2/3) ... [2021-05-02 11:49:53,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2426d5c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:53, skipping insertion in model container [2021-05-02 11:49:53,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:53" (3/3) ... [2021-05-02 11:49:53,402 INFO L111 eAbstractionObserver]: Analyzing ICFG linear_sea.ch.c [2021-05-02 11:49:53,406 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:49:53,408 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:49:53,433 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:49:53,448 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:49:53,448 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:49:53,448 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:49:53,448 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:49:53,448 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:49:53,448 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:49:53,448 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:49:53,459 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:49:53,469 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 11:49:53,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 11:49:53,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,473 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,473 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1932061399, now seen corresponding path program 1 times [2021-05-02 11:49:53,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,482 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346933731] [2021-05-02 11:49:53,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:53,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,741 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 11:49:53,742 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346933731] [2021-05-02 11:49:53,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346933731] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:53,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:53,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:49:53,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086117338] [2021-05-02 11:49:53,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:49:53,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:53,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:49:53,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:53,755 INFO L87 Difference]: Start difference. First operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:53,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:53,814 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2021-05-02 11:49:53,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:49:53,816 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 11:49:53,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,824 INFO L225 Difference]: With dead ends: 44 [2021-05-02 11:49:53,824 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 11:49:53,828 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:53,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 11:49:53,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 11:49:53,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:53,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-02 11:49:53,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 18 [2021-05-02 11:49:53,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,858 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-02 11:49:53,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:53,858 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-02 11:49:53,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:49:53,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,860 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:49:53,860 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1053531614, now seen corresponding path program 1 times [2021-05-02 11:49:53,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844794525] [2021-05-02 11:49:53,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:54,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:54,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:54,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844794525] [2021-05-02 11:49:54,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844794525] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:54,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:54,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 11:49:54,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058030935] [2021-05-02 11:49:54,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:49:54,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:54,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:49:54,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:54,032 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:54,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:54,169 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-05-02 11:49:54,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:49:54,169 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-05-02 11:49:54,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:54,170 INFO L225 Difference]: With dead ends: 29 [2021-05-02 11:49:54,171 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 11:49:54,172 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 106.2ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:54,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 11:49:54,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 11:49:54,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:54,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 11:49:54,183 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 20 [2021-05-02 11:49:54,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:54,183 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 11:49:54,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:54,184 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 11:49:54,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:49:54,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:54,185 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:54,187 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:49:54,187 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:54,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:54,188 INFO L82 PathProgramCache]: Analyzing trace with hash 689278721, now seen corresponding path program 1 times [2021-05-02 11:49:54,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:54,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185335371] [2021-05-02 11:49:54,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:54,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:54,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:54,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,319 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 11:49:54,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:54,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185335371] [2021-05-02 11:49:54,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185335371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:54,320 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:54,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 11:49:54,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406589273] [2021-05-02 11:49:54,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:49:54,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:54,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:49:54,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:49:54,321 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:54,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:54,472 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-02 11:49:54,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:49:54,473 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 11:49:54,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:54,473 INFO L225 Difference]: With dead ends: 33 [2021-05-02 11:49:54,473 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 11:49:54,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 125.0ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:54,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 11:49:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 11:49:54,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:54,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-02 11:49:54,477 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2021-05-02 11:49:54,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:54,477 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-02 11:49:54,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:54,478 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-02 11:49:54,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:49:54,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:54,478 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:54,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 11:49:54,478 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:54,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:54,479 INFO L82 PathProgramCache]: Analyzing trace with hash 7635558, now seen corresponding path program 1 times [2021-05-02 11:49:54,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:54,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072225637] [2021-05-02 11:49:54,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:54,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:54,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:54,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,668 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:54,669 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:54,669 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072225637] [2021-05-02 11:49:54,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072225637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:54,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43612628] [2021-05-02 11:49:54,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:54,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:49:54,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:54,933 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:54,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43612628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:54,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:54,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 12 [2021-05-02 11:49:54,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242871357] [2021-05-02 11:49:54,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 11:49:54,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:54,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 11:49:54,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:49:54,936 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 11:49:55,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:55,183 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-05-02 11:49:55,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:49:55,184 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 11:49:55,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:55,185 INFO L225 Difference]: With dead ends: 36 [2021-05-02 11:49:55,185 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 11:49:55,185 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 246.1ms TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:49:55,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 11:49:55,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 11:49:55,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:55,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-02 11:49:55,190 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-02 11:49:55,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:55,190 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-02 11:49:55,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 11:49:55,190 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-02 11:49:55,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 11:49:55,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:55,191 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:55,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:55,405 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:55,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:55,405 INFO L82 PathProgramCache]: Analyzing trace with hash -218457887, now seen corresponding path program 2 times [2021-05-02 11:49:55,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:55,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999666823] [2021-05-02 11:49:55,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:55,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:55,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:55,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,623 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 11:49:55,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:55,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999666823] [2021-05-02 11:49:55,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999666823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283121649] [2021-05-02 11:49:55,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:55,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-02 11:49:55,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:55,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 11:49:55,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:55,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,971 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 11:49:55,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283121649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:55,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2021-05-02 11:49:55,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043312963] [2021-05-02 11:49:55,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 11:49:55,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:55,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 11:49:55,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:49:55,975 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 11:49:56,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:56,311 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-02 11:49:56,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:49:56,312 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 26 [2021-05-02 11:49:56,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:56,314 INFO L225 Difference]: With dead ends: 39 [2021-05-02 11:49:56,314 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:49:56,315 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 420.6ms TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2021-05-02 11:49:56,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:49:56,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2021-05-02 11:49:56,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:56,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-02 11:49:56,327 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 26 [2021-05-02 11:49:56,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:56,327 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-02 11:49:56,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 11:49:56,327 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-02 11:49:56,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 11:49:56,328 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:56,328 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:56,557 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:56,558 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:56,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:56,558 INFO L82 PathProgramCache]: Analyzing trace with hash -611484897, now seen corresponding path program 1 times [2021-05-02 11:49:56,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:56,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894891066] [2021-05-02 11:49:56,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:56,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:56,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:56,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,178 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:57,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:57,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894891066] [2021-05-02 11:49:57,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894891066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867942632] [2021-05-02 11:49:57,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:57,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 11:49:57,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:57,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 11:49:57,325 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,341 INFO L628 ElimStorePlain]: treesize reduction 52, result has 35.0 percent of original size [2021-05-02 11:49:57,341 INFO L518 ElimStorePlain]: Eliminatee |v_#memory_int_7| vanished before elimination [2021-05-02 11:49:57,342 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,342 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:84, output treesize:28 [2021-05-02 11:49:57,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,800 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:57,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867942632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:57,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2021-05-02 11:49:57,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200066224] [2021-05-02 11:49:57,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 11:49:57,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:57,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 11:49:57,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 11:49:57,801 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:49:58,441 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 83 [2021-05-02 11:49:58,632 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 92 [2021-05-02 11:49:58,769 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 93 [2021-05-02 11:49:59,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:59,412 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2021-05-02 11:49:59,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 11:49:59,412 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 26 [2021-05-02 11:49:59,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:59,414 INFO L225 Difference]: With dead ends: 49 [2021-05-02 11:49:59,414 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 11:49:59,414 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 1570.0ms TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-05-02 11:49:59,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 11:49:59,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2021-05-02 11:49:59,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:59,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-02 11:49:59,418 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 26 [2021-05-02 11:49:59,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:59,431 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-02 11:49:59,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:49:59,431 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-02 11:49:59,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 11:49:59,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:59,432 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:59,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:59,632 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:59,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:59,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1198290911, now seen corresponding path program 2 times [2021-05-02 11:49:59,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:59,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323694752] [2021-05-02 11:49:59,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:59,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:59,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 11:49:59,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:59,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323694752] [2021-05-02 11:49:59,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323694752] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:59,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:59,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:49:59,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080543106] [2021-05-02 11:49:59,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:59,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:59,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:59,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:59,678 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:59,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:59,723 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-05-02 11:49:59,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:49:59,723 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2021-05-02 11:49:59,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:59,724 INFO L225 Difference]: With dead ends: 50 [2021-05-02 11:49:59,724 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:49:59,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:59,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:49:59,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 11:49:59,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:59,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 11:49:59,727 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2021-05-02 11:49:59,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:59,727 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 11:49:59,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:49:59,728 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 11:49:59,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:49:59,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:59,728 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:59,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 11:49:59,728 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:59,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:59,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1652584764, now seen corresponding path program 3 times [2021-05-02 11:49:59,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:59,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769547647] [2021-05-02 11:49:59,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:59,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:59,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:49:59,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,470 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:00,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769547647] [2021-05-02 11:50:00,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769547647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338522828] [2021-05-02 11:50:00,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:00,581 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 11:50:00,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:00,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 11:50:00,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:00,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 11:50:00,615 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:50:00,644 INFO L628 ElimStorePlain]: treesize reduction 68, result has 34.6 percent of original size [2021-05-02 11:50:00,644 INFO L518 ElimStorePlain]: Eliminatee v_prenex_2 vanished before elimination [2021-05-02 11:50:00,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:50:00,645 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:108, output treesize:36 [2021-05-02 11:50:00,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,160 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 50 [2021-05-02 11:50:01,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,590 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:01,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338522828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:01,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:01,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 28 [2021-05-02 11:50:01,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906835943] [2021-05-02 11:50:01,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 11:50:01,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:01,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 11:50:01,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2021-05-02 11:50:01,591 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:50:02,052 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 83 [2021-05-02 11:50:02,298 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 92 [2021-05-02 11:50:02,458 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 86 [2021-05-02 11:50:02,628 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 88 [2021-05-02 11:50:02,866 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 100 [2021-05-02 11:50:03,051 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 88 [2021-05-02 11:50:03,239 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 98 [2021-05-02 11:50:03,428 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 93 [2021-05-02 11:50:03,585 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 90 [2021-05-02 11:50:03,824 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 99 [2021-05-02 11:50:05,366 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 90 [2021-05-02 11:50:05,642 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 86 [2021-05-02 11:50:05,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:05,792 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2021-05-02 11:50:05,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 11:50:05,793 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2021-05-02 11:50:05,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:05,793 INFO L225 Difference]: With dead ends: 44 [2021-05-02 11:50:05,793 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 11:50:05,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 3757.9ms TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 11:50:05,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 11:50:05,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 11:50:05,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:50:05,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 11:50:05,800 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2021-05-02 11:50:05,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:05,800 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 11:50:05,800 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 24 states have internal predecessors, (41), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:50:05,800 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 11:50:05,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:50:05,801 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:05,801 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:06,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:06,013 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:06,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:06,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1195089151, now seen corresponding path program 4 times [2021-05-02 11:50:06,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:06,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746890557] [2021-05-02 11:50:06,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:06,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:06,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:06,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:06,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:50:06,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:07,614 WARN L205 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 87 [2021-05-02 11:50:09,326 WARN L205 SmtUtils]: Spent 1.56 s on a formula simplification. DAG size of input: 110 DAG size of output: 106 [2021-05-02 11:50:12,573 WARN L205 SmtUtils]: Spent 2.31 s on a formula simplification. DAG size of input: 109 DAG size of output: 105 [2021-05-02 11:50:17,137 WARN L205 SmtUtils]: Spent 2.01 s on a formula simplification. DAG size of input: 104 DAG size of output: 98 [2021-05-02 11:50:20,532 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 78 [2021-05-02 11:50:22,312 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 76 [2021-05-02 11:50:23,249 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 79 [2021-05-02 11:50:23,250 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:23,251 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:23,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746890557] [2021-05-02 11:50:23,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746890557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:23,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28401959] [2021-05-02 11:50:23,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:23,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:50:23,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:23,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 11:50:23,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:23,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-02 11:50:23,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:50:23,461 INFO L628 ElimStorePlain]: treesize reduction 68, result has 34.6 percent of original size [2021-05-02 11:50:23,461 INFO L518 ElimStorePlain]: Eliminatee v_prenex_3 vanished before elimination [2021-05-02 11:50:23,462 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:50:23,462 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:108, output treesize:36 [2021-05-02 11:50:23,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:23,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:24,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,829 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 49 [2021-05-02 11:50:25,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:25,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:26,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:27,655 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:27,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28401959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:27,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:27,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 31 [2021-05-02 11:50:27,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794350903] [2021-05-02 11:50:27,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 11:50:27,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:27,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 11:50:27,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=845, Unknown=2, NotChecked=0, Total=930 [2021-05-02 11:50:27,657 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:50:28,488 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-02 11:50:29,162 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-02 11:50:29,404 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-02 11:50:29,763 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 92 [2021-05-02 11:50:30,834 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 114 [2021-05-02 11:50:31,181 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 124 [2021-05-02 11:50:32,206 WARN L205 SmtUtils]: Spent 811.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 150 [2021-05-02 11:50:35,289 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 125 [2021-05-02 11:50:35,929 WARN L205 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 129 [2021-05-02 11:50:38,725 WARN L205 SmtUtils]: Spent 2.54 s on a formula simplification. DAG size of input: 209 DAG size of output: 150 [2021-05-02 11:50:53,613 WARN L205 SmtUtils]: Spent 8.34 s on a formula simplification. DAG size of input: 276 DAG size of output: 126 [2021-05-02 11:51:05,200 WARN L205 SmtUtils]: Spent 3.08 s on a formula simplification. DAG size of input: 206 DAG size of output: 124 [2021-05-02 11:51:16,534 WARN L205 SmtUtils]: Spent 5.48 s on a formula simplification. DAG size of input: 208 DAG size of output: 119 [2021-05-02 11:51:18,842 WARN L205 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 171 DAG size of output: 168 [2021-05-02 11:51:20,515 WARN L205 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 153 DAG size of output: 150 [2021-05-02 11:51:20,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:20,740 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-02 11:51:20,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 11:51:20,741 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 11:51:20,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:20,742 INFO L225 Difference]: With dead ends: 53 [2021-05-02 11:51:20,742 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 11:51:20,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 22 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 70467.5ms TimeCoverageRelationStatistics Valid=349, Invalid=2196, Unknown=5, NotChecked=0, Total=2550 [2021-05-02 11:51:20,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 11:51:20,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2021-05-02 11:51:20,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:51:20,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 11:51:20,747 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2021-05-02 11:51:20,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:20,748 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 11:51:20,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 29 states have (on average 1.6206896551724137) internal successors, (47), 27 states have internal predecessors, (47), 6 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 11:51:20,748 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 11:51:20,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 11:51:20,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:20,748 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:20,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 11:51:20,973 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:20,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:20,973 INFO L82 PathProgramCache]: Analyzing trace with hash 2054660324, now seen corresponding path program 5 times [2021-05-02 11:51:20,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:20,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115317041] [2021-05-02 11:51:20,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:21,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:21,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:21,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:21,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-02 11:51:21,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat