/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:21:26,541 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:21:26,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:21:26,573 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:21:26,596 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:21:26,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:21:26,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:21:26,602 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:21:26,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:21:26,608 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:21:26,610 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:21:26,615 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:21:26,616 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:21:26,618 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:21:26,620 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:21:26,621 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:21:26,625 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:21:26,634 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:21:26,644 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:21:26,645 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:21:26,649 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 12:21:26,663 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:21:26,663 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:21:26,666 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:21:26,666 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:21:26,666 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:21:26,667 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:21:26,667 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:21:26,667 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:21:26,667 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:21:26,667 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:21:26,668 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:21:26,668 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:21:26,669 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:21:26,669 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:21:26,670 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:21:26,670 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:21:26,670 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:21:26,670 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:21:26,670 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:21:26,945 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:21:26,965 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:21:26,967 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:21:26,968 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:21:26,968 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:21:26,969 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2021-05-06 12:21:27,017 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd44ba77/f0f1ad53e8b342ab99b37fce35ec4135/FLAGa492a0b58 [2021-05-06 12:21:27,375 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:21:27,376 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2021-05-06 12:21:27,382 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd44ba77/f0f1ad53e8b342ab99b37fce35ec4135/FLAGa492a0b58 [2021-05-06 12:21:27,757 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd44ba77/f0f1ad53e8b342ab99b37fce35ec4135 [2021-05-06 12:21:27,759 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:21:27,760 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:21:27,762 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:21:27,762 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:21:27,780 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:21:27,780 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:27,781 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14c06b04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27, skipping insertion in model container [2021-05-06 12:21:27,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:27,788 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:21:27,800 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:21:27,897 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c[533,546] [2021-05-06 12:21:27,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:21:27,928 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:21:27,938 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c[533,546] [2021-05-06 12:21:27,951 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:21:27,962 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:21:27,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27 WrapperNode [2021-05-06 12:21:27,963 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:21:27,964 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:21:27,964 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:21:27,964 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:21:27,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:27,993 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:27,998 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:27,999 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:28,005 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:28,009 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:28,045 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... [2021-05-06 12:21:28,047 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:21:28,048 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:21:28,048 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:21:28,048 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:21:28,050 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:21:28,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:21:28,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:21:28,122 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:21:28,122 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:21:28,122 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:21:28,123 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:21:28,123 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:21:28,123 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:21:28,123 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:21:28,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:21:28,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 12:21:28,124 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:21:28,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:21:28,125 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:21:28,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:21:28,125 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:21:28,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:21:28,126 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:21:28,126 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:21:28,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:21:28,489 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:21:28,489 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 12:21:28,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:21:28 BoogieIcfgContainer [2021-05-06 12:21:28,490 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:21:28,492 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:21:28,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:21:28,494 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:21:28,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:21:27" (1/3) ... [2021-05-06 12:21:28,495 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443bbcee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:21:28, skipping insertion in model container [2021-05-06 12:21:28,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:21:27" (2/3) ... [2021-05-06 12:21:28,495 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443bbcee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:21:28, skipping insertion in model container [2021-05-06 12:21:28,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:21:28" (3/3) ... [2021-05-06 12:21:28,496 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u.c [2021-05-06 12:21:28,501 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:21:28,504 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:21:28,519 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:21:28,537 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:21:28,537 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:21:28,537 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:21:28,537 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:21:28,537 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:21:28,537 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:21:28,537 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:21:28,538 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:21:28,550 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 12:21:28,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 12:21:28,556 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:28,556 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:28,557 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:28,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:28,561 INFO L82 PathProgramCache]: Analyzing trace with hash 818818098, now seen corresponding path program 1 times [2021-05-06 12:21:28,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:28,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377313128] [2021-05-06 12:21:28,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:28,620 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:21:28,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:28,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:28,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:28,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:21:28,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:28,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:21:28,865 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:21:28,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377313128] [2021-05-06 12:21:28,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1377313128] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:21:28,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:21:28,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:21:28,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251940981] [2021-05-06 12:21:28,872 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:21:28,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:21:28,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:21:28,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:21:28,889 INFO L87 Difference]: Start difference. First operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) 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) [2021-05-06 12:21:29,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:21:29,312 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2021-05-06 12:21:29,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:21:29,314 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 [2021-05-06 12:21:29,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:21:29,320 INFO L225 Difference]: With dead ends: 65 [2021-05-06 12:21:29,320 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 12:21:29,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 88.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:21:29,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 12:21:29,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 12:21:29,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 12:21:29,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 12:21:29,373 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-06 12:21:29,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:21:29,373 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 12:21:29,374 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) [2021-05-06 12:21:29,374 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 12:21:29,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 12:21:29,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:29,374 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:29,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:21:29,375 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:29,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:29,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1723375776, now seen corresponding path program 1 times [2021-05-06 12:21:29,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:29,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104273776] [2021-05-06 12:21:29,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:29,378 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:21:29,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:29,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:29,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 12:21:29,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:29,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:21:29,682 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:21:29,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104273776] [2021-05-06 12:21:29,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1104273776] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:21:29,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:21:29,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:21:29,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686862605] [2021-05-06 12:21:29,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:21:29,683 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:21:29,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:21:29,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:21:29,684 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)