/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/ludcmp.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:09:12,422 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:09:12,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:09:12,455 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:09:12,471 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:09:12,473 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:09:12,474 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:09:12,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:09:12,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:09:12,477 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:09:12,479 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:09:12,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:09:12,484 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:09:12,485 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:09:12,486 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:09:12,487 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:09:12,492 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:09:12,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:09:12,500 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:09:12,501 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:09:12,504 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:09:12,518 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:09:12,518 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:09:12,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:09:12,520 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:09:12,520 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:09:12,521 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:09:12,522 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:09:12,522 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:12,523 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:09:12,523 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:09:12,523 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:09:12,523 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:09:12,523 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:09:12,802 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:09:12,818 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:09:12,820 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:09:12,821 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:09:12,821 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:09:12,822 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/ludcmp.c [2021-05-06 11:09:12,872 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d909178e0/53c592e8245541dcbcc895a036316db2/FLAGe4f243f4a [2021-05-06 11:09:13,256 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:09:13,257 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/ludcmp.c [2021-05-06 11:09:13,267 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d909178e0/53c592e8245541dcbcc895a036316db2/FLAGe4f243f4a [2021-05-06 11:09:13,282 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d909178e0/53c592e8245541dcbcc895a036316db2 [2021-05-06 11:09:13,283 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:13,285 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:13,288 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:13,288 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:13,291 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:13,291 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,292 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10bff523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13, skipping insertion in model container [2021-05-06 11:09:13,292 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,296 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:13,318 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:13,436 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/ludcmp.c[318,331] [2021-05-06 11:09:13,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:13,493 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:13,540 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/ludcmp.c[318,331] [2021-05-06 11:09:13,573 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:13,587 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:13,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13 WrapperNode [2021-05-06 11:09:13,588 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:13,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:13,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:13,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:13,597 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,597 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,628 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,634 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... [2021-05-06 11:09:13,642 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:13,643 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:13,643 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:13,643 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:13,644 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:13,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:13,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:13,698 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:13,698 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:13,698 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs [2021-05-06 11:09:13,698 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:13,698 INFO L138 BoogieDeclarations]: Found implementation of procedure ludcmp [2021-05-06 11:09:13,698 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure ludcmp [2021-05-06 11:09:13,699 INFO L130 BoogieDeclarations]: Found specification of procedure fabs [2021-05-06 11:09:13,700 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:13,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2021-05-06 11:09:13,700 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2021-05-06 11:09:13,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:13,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:13,702 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:13,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:13,702 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:13,702 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:14,079 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:14,079 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-05-06 11:09:14,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:14 BoogieIcfgContainer [2021-05-06 11:09:14,080 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:14,081 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:14,081 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:14,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:14,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:13" (1/3) ... [2021-05-06 11:09:14,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b91653c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:14, skipping insertion in model container [2021-05-06 11:09:14,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:13" (2/3) ... [2021-05-06 11:09:14,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b91653c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:14, skipping insertion in model container [2021-05-06 11:09:14,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:14" (3/3) ... [2021-05-06 11:09:14,087 INFO L111 eAbstractionObserver]: Analyzing ICFG ludcmp.c [2021-05-06 11:09:14,093 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:14,096 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:14,108 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:14,131 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:14,131 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:14,132 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:14,132 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:14,132 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:14,132 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:14,132 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:14,132 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:14,145 INFO L276 IsEmpty]: Start isEmpty. Operand has 64 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 53 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:14,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:09:14,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,151 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,152 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1448102218, now seen corresponding path program 1 times [2021-05-06 11:09:14,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364605426] [2021-05-06 11:09:14,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:14,212 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:14,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:14,412 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:14,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364605426] [2021-05-06 11:09:14,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [364605426] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:14,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:14,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:09:14,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066542567] [2021-05-06 11:09:14,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:09:14,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:09:14,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:14,426 INFO L87 Difference]: Start difference. First operand has 64 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 53 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:14,623 INFO L93 Difference]: Finished difference Result 127 states and 191 transitions. [2021-05-06 11:09:14,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:09:14,624 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:09:14,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:14,630 INFO L225 Difference]: With dead ends: 127 [2021-05-06 11:09:14,631 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 11:09:14,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 69.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:14,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 11:09:14,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 20. [2021-05-06 11:09:14,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-06 11:09:14,663 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-05-06 11:09:14,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:14,663 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-06 11:09:14,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,664 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-06 11:09:14,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:09:14,665 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,665 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:14,665 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1436096445, now seen corresponding path program 1 times [2021-05-06 11:09:14,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844928380] [2021-05-06 11:09:14,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:14,676 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:14,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:14,816 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:14,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844928380] [2021-05-06 11:09:14,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [844928380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:14,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:14,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:14,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494090902] [2021-05-06 11:09:14,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:14,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:14,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:14,819 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:14,979 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-06 11:09:14,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:14,980 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:09:14,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:14,981 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:09:14,981 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:09:14,982 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 125.3ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:14,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:09:14,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2021-05-06 11:09:14,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-06 11:09:14,992 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2021-05-06 11:09:14,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:14,992 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-06 11:09:14,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,993 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-06 11:09:14,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 11:09:14,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,993 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:14,994 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1858105272, now seen corresponding path program 1 times [2021-05-06 11:09:14,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875812659] [2021-05-06 11:09:14,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,017 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,018 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:15,024 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,146 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875812659] [2021-05-06 11:09:15,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [875812659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:15,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995421146] [2021-05-06 11:09:15,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:15,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:15,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:15,148 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,277 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-05-06 11:09:15,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:15,277 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 11:09:15,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,278 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:09:15,278 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:09:15,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 118.5ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:15,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:09:15,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-05-06 11:09:15,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:15,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:09:15,282 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2021-05-06 11:09:15,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,282 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:09:15,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,282 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:09:15,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:09:15,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,283 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:09:15,283 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1949651507, now seen corresponding path program 2 times [2021-05-06 11:09:15,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397170385] [2021-05-06 11:09:15,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,290 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,291 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:15,292 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,372 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397170385] [2021-05-06 11:09:15,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [397170385] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:15,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492619036] [2021-05-06 11:09:15,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:15,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:15,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:15,373 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,565 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-06 11:09:15,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:15,565 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:09:15,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,566 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:09:15,566 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 11:09:15,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 168.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:15,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 11:09:15,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2021-05-06 11:09:15,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:15,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-06 11:09:15,572 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 20 [2021-05-06 11:09:15,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,572 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-06 11:09:15,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,572 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-06 11:09:15,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:09:15,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,573 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:15,573 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1140304881, now seen corresponding path program 1 times [2021-05-06 11:09:15,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835410503] [2021-05-06 11:09:15,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,582 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,583 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:15,584 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,659 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835410503] [2021-05-06 11:09:15,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [835410503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:15,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268341252] [2021-05-06 11:09:15,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:15,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:15,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:15,660 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,812 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-05-06 11:09:15,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:15,813 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:09:15,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,813 INFO L225 Difference]: With dead ends: 68 [2021-05-06 11:09:15,814 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 11:09:15,814 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 120.5ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:15,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 11:09:15,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2021-05-06 11:09:15,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:15,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2021-05-06 11:09:15,820 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 20 [2021-05-06 11:09:15,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,820 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2021-05-06 11:09:15,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,820 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2021-05-06 11:09:15,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:09:15,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,821 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:09:15,821 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,821 INFO L82 PathProgramCache]: Analyzing trace with hash -162258006, now seen corresponding path program 2 times [2021-05-06 11:09:15,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663148997] [2021-05-06 11:09:15,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,830 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,830 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:15,831 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,926 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663148997] [2021-05-06 11:09:15,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1663148997] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:15,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591878363] [2021-05-06 11:09:15,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:15,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:15,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:15,927 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:16,089 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2021-05-06 11:09:16,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:09:16,090 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-06 11:09:16,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:16,092 INFO L225 Difference]: With dead ends: 80 [2021-05-06 11:09:16,092 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:09:16,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 131.4ms TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:16,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:09:16,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-05-06 11:09:16,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:16,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-06 11:09:16,106 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 24 [2021-05-06 11:09:16,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:16,106 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-06 11:09:16,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,107 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-06 11:09:16,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 11:09:16,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:16,108 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:16,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:09:16,108 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:16,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:16,108 INFO L82 PathProgramCache]: Analyzing trace with hash -1312024861, now seen corresponding path program 3 times [2021-05-06 11:09:16,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:16,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300530412] [2021-05-06 11:09:16,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:16,121 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:16,121 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:16,125 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:16,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:16,228 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:16,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300530412] [2021-05-06 11:09:16,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1300530412] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:16,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:16,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:16,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554532679] [2021-05-06 11:09:16,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:16,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:16,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:16,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:16,229 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:16,392 INFO L93 Difference]: Finished difference Result 92 states and 107 transitions. [2021-05-06 11:09:16,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:16,393 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-06 11:09:16,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:16,393 INFO L225 Difference]: With dead ends: 92 [2021-05-06 11:09:16,394 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:09:16,394 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 143.4ms TimeCoverageRelationStatistics Valid=76, Invalid=134, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:16,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:09:16,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-05-06 11:09:16,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:16,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2021-05-06 11:09:16,400 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 28 [2021-05-06 11:09:16,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:16,400 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2021-05-06 11:09:16,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,400 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2021-05-06 11:09:16,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:09:16,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:16,401 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:16,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:09:16,401 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:16,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:16,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1026934172, now seen corresponding path program 4 times [2021-05-06 11:09:16,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:16,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68663931] [2021-05-06 11:09:16,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:16,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:16,416 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:16,417 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:16,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:16,499 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:16,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68663931] [2021-05-06 11:09:16,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [68663931] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:16,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:16,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:09:16,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777900242] [2021-05-06 11:09:16,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:09:16,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:16,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:09:16,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:16,500 INFO L87 Difference]: Start difference. First operand 59 states and 66 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:16,713 INFO L93 Difference]: Finished difference Result 98 states and 114 transitions. [2021-05-06 11:09:16,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:09:16,713 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:09:16,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:16,714 INFO L225 Difference]: With dead ends: 98 [2021-05-06 11:09:16,714 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:09:16,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 153.0ms TimeCoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:16,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:09:16,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-06 11:09:16,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 61 states have (on average 1.1475409836065573) internal successors, (70), 61 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:16,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-06 11:09:16,721 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 32 [2021-05-06 11:09:16,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:16,721 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-06 11:09:16,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,722 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-06 11:09:16,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:09:16,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:16,722 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:16,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:09:16,722 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:16,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:16,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1975029803, now seen corresponding path program 5 times [2021-05-06 11:09:16,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:16,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121793949] [2021-05-06 11:09:16,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:16,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: -1 HavocedVariables, -1 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:16,732 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because SIMULTANEOUS_UPDATE_FAILED [2021-05-06 11:09:16,733 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:09:16,745 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:09:16,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:09:16,755 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:09:16,771 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-06 11:09:16,771 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 11:09:16,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:09:16,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:09:16 BoogieIcfgContainer [2021-05-06 11:09:16,781 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:09:16,782 INFO L168 Benchmark]: Toolchain (without parser) took 3496.85 ms. Allocated memory was 177.2 MB in the beginning and 218.1 MB in the end (delta: 40.9 MB). Free memory was 142.8 MB in the beginning and 141.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 43.5 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:16,782 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 177.2 MB. Free memory is still 159.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:09:16,782 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.02 ms. Allocated memory is still 177.2 MB. Free memory was 142.7 MB in the beginning and 159.3 MB in the end (delta: -16.6 MB). Peak memory consumption was 14.8 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:16,783 INFO L168 Benchmark]: Boogie Preprocessor took 52.85 ms. Allocated memory is still 177.2 MB. Free memory was 159.3 MB in the beginning and 157.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:16,783 INFO L168 Benchmark]: RCFGBuilder took 436.95 ms. Allocated memory is still 177.2 MB. Free memory was 157.2 MB in the beginning and 127.3 MB in the end (delta: 29.9 MB). Peak memory consumption was 30.4 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:16,783 INFO L168 Benchmark]: TraceAbstraction took 2700.22 ms. Allocated memory was 177.2 MB in the beginning and 218.1 MB in the end (delta: 40.9 MB). Free memory was 126.8 MB in the beginning and 141.7 MB in the end (delta: -14.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 8.0 GB. [2021-05-06 11:09:16,785 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 177.2 MB. Free memory is still 159.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 301.02 ms. Allocated memory is still 177.2 MB. Free memory was 142.7 MB in the beginning and 159.3 MB in the end (delta: -16.6 MB). Peak memory consumption was 14.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 52.85 ms. Allocated memory is still 177.2 MB. Free memory was 159.3 MB in the beginning and 157.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 436.95 ms. Allocated memory is still 177.2 MB. Free memory was 157.2 MB in the beginning and 127.3 MB in the end (delta: 29.9 MB). Peak memory consumption was 30.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2700.22 ms. Allocated memory was 177.2 MB in the beginning and 218.1 MB in the end (delta: 40.9 MB). Free memory was 126.8 MB in the beginning and 141.7 MB in the end (delta: -14.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 7]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of to_real at line 98, overapproximation of someBinaryArithmeticDOUBLEoperation at line 100. Possible FailurePath: [L71] double a[50][50], b[50], x[50]; [L88] int i, j, nmax = 50, n = 5, chkerr; [L89] double eps, w; [L91] eps = 1.0e-6 [L93] i = 0 [L93] COND TRUE i <= n [L95] w = 0.0 [L96] j = 0 [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND TRUE i == j [L99] EXPR a[i][j] [L99] a[i][j] *= 10.0 [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND FALSE !(i == j) [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND FALSE !(i == j) [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND FALSE !(i == j) [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND FALSE !(i == j) [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) [L99] COND FALSE !(i == j) [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ [L96] COND FALSE !(j <= n) [L102] CALL __VERIFIER_assert(i==2) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 67 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2642.6ms, OverallIterations: 9, TraceHistogramMax: 6, EmptinessCheckTime: 12.9ms, AutomataDifference: 1403.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 181 SDtfs, 287 SDslu, 181 SDs, 0 SdLazy, 479 SolverSat, 73 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 441.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 92 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1031.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=8, InterpolantAutomatonStates: 67, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 69.5ms AutomataMinimizationTime, 8 MinimizatonAttempts, 35 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...