/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-crafted-1/watermelon.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-03 00:25:31,930 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-03 00:25:31,931 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-03 00:25:31,973 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-03 00:25:32,008 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-03 00:25:32,017 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-03 00:25:32,018 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-03 00:25:32,020 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-03 00:25:32,036 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-03 00:25:32,037 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-03 00:25:32,038 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-03 00:25:32,038 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-03 00:25:32,038 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-03 00:25:32,039 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-03 00:25:32,040 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-03 00:25:32,040 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-03 00:25:32,040 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-03 00:25:32,040 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-03 00:25:32,040 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-03 00:25:32,040 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-03 00:25:32,041 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-03 00:25:32,041 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-03 00:25:32,041 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-03 00:25:32,041 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-03 00:25:32,041 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-03 00:25:32,041 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-03 00:25:32,042 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-03 00:25:32,364 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-03 00:25:32,383 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-03 00:25:32,385 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-03 00:25:32,386 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-03 00:25:32,387 INFO L275 PluginConnector]: CDTParser initialized [2021-05-03 00:25:32,388 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-05-03 00:25:32,451 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24134edd7/e3482e515b344524a4264dcd11b1079b/FLAG2b165654f [2021-05-03 00:25:32,918 INFO L306 CDTParser]: Found 1 translation units. [2021-05-03 00:25:32,919 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-05-03 00:25:32,924 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24134edd7/e3482e515b344524a4264dcd11b1079b/FLAG2b165654f [2021-05-03 00:25:33,324 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24134edd7/e3482e515b344524a4264dcd11b1079b [2021-05-03 00:25:33,326 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-03 00:25:33,328 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-03 00:25:33,335 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-03 00:25:33,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-03 00:25:33,338 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-03 00:25:33,339 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,340 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5dc121b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33, skipping insertion in model container [2021-05-03 00:25:33,340 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,361 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-03 00:25:33,373 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-03 00:25:33,481 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-crafted-1/watermelon.c[373,386] [2021-05-03 00:25:33,497 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:25:33,503 INFO L203 MainTranslator]: Completed pre-run [2021-05-03 00:25:33,514 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-crafted-1/watermelon.c[373,386] [2021-05-03 00:25:33,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:25:33,544 INFO L208 MainTranslator]: Completed translation [2021-05-03 00:25:33,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33 WrapperNode [2021-05-03 00:25:33,545 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-03 00:25:33,546 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-03 00:25:33,547 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-03 00:25:33,547 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-03 00:25:33,556 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,556 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,562 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,562 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,602 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (1/1) ... [2021-05-03 00:25:33,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-03 00:25:33,629 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-03 00:25:33,629 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-03 00:25:33,629 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-03 00:25:33,630 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (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 [2021-05-03 00:25:33,726 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-03 00:25:33,726 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-03 00:25:33,726 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-03 00:25:33,726 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-03 00:25:33,726 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2021-05-03 00:25:33,727 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2021-05-03 00:25:33,727 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-03 00:25:33,727 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-03 00:25:33,727 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-03 00:25:33,728 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-03 00:25:33,728 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-03 00:25:33,728 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-03 00:25:33,728 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-03 00:25:33,730 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2021-05-03 00:25:33,730 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2021-05-03 00:25:33,730 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-03 00:25:33,730 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-03 00:25:33,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-03 00:25:33,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-03 00:25:33,733 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-03 00:25:33,733 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-03 00:25:33,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-03 00:25:34,057 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-03 00:25:34,057 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-03 00:25:34,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:25:34 BoogieIcfgContainer [2021-05-03 00:25:34,059 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-03 00:25:34,060 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-03 00:25:34,060 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-03 00:25:34,063 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-03 00:25:34,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.05 12:25:33" (1/3) ... [2021-05-03 00:25:34,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18734b83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:25:34, skipping insertion in model container [2021-05-03 00:25:34,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:25:33" (2/3) ... [2021-05-03 00:25:34,065 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18734b83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:25:34, skipping insertion in model container [2021-05-03 00:25:34,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:25:34" (3/3) ... [2021-05-03 00:25:34,066 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2021-05-03 00:25:34,072 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-03 00:25:34,075 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-03 00:25:34,090 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-03 00:25:34,108 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-03 00:25:34,108 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-03 00:25:34,108 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-03 00:25:34,108 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-03 00:25:34,109 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-03 00:25:34,109 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-03 00:25:34,109 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-03 00:25:34,109 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-03 00:25:34,122 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 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) [2021-05-03 00:25:34,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-03 00:25:34,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:34,128 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:34,128 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:34,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:34,133 INFO L82 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 1 times [2021-05-03 00:25:34,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:34,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524677350] [2021-05-03 00:25:34,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:34,235 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:25:34,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:34,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:34,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:34,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:34,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:34,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-03 00:25:34,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:34,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:34,720 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:34,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524677350] [2021-05-03 00:25:34,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [524677350] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:34,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:34,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:25:34,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520847074] [2021-05-03 00:25:34,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:25:34,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:34,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:25:34,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:25:34,744 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 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 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:35,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:35,627 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2021-05-03 00:25:35,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:25:35,630 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-03 00:25:35,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:35,638 INFO L225 Difference]: With dead ends: 91 [2021-05-03 00:25:35,638 INFO L226 Difference]: Without dead ends: 42 [2021-05-03 00:25:35,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 555.3ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-03 00:25:35,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-03 00:25:35,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-03 00:25:35,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:35,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-03 00:25:35,689 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 25 [2021-05-03 00:25:35,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:35,689 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-03 00:25:35,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:35,690 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-03 00:25:35,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-03 00:25:35,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:35,692 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:35,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-03 00:25:35,693 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:35,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:35,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 1 times [2021-05-03 00:25:35,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:35,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404535666] [2021-05-03 00:25:35,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:35,697 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:25:35,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:35,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:35,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:35,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:35,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-03 00:25:35,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:35,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:35,775 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:35,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404535666] [2021-05-03 00:25:35,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [404535666] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:35,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:35,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-03 00:25:35,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477332267] [2021-05-03 00:25:35,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-03 00:25:35,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:35,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-03 00:25:35,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-03 00:25:35,778 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:35,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:35,904 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-05-03 00:25:35,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-03 00:25:35,905 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2021-05-03 00:25:35,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:35,909 INFO L225 Difference]: With dead ends: 55 [2021-05-03 00:25:35,909 INFO L226 Difference]: Without dead ends: 42 [2021-05-03 00:25:35,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-03 00:25:35,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-03 00:25:35,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-03 00:25:35,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:35,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-05-03 00:25:35,942 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 27 [2021-05-03 00:25:35,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:35,943 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-05-03 00:25:35,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:35,943 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-05-03 00:25:35,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-03 00:25:35,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:35,944 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:35,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-03 00:25:35,944 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:35,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:35,945 INFO L82 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 1 times [2021-05-03 00:25:35,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:35,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147716896] [2021-05-03 00:25:35,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:35,948 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:25:35,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:35,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:35,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:36,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-03 00:25:36,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:36,018 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:36,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147716896] [2021-05-03 00:25:36,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [147716896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:36,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:36,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-03 00:25:36,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445072906] [2021-05-03 00:25:36,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-03 00:25:36,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:36,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-03 00:25:36,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-03 00:25:36,021 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:36,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:36,118 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2021-05-03 00:25:36,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-03 00:25:36,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-03 00:25:36,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:36,119 INFO L225 Difference]: With dead ends: 72 [2021-05-03 00:25:36,120 INFO L226 Difference]: Without dead ends: 43 [2021-05-03 00:25:36,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-03 00:25:36,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-03 00:25:36,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-03 00:25:36,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:36,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-05-03 00:25:36,132 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 27 [2021-05-03 00:25:36,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:36,132 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-05-03 00:25:36,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:36,132 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-05-03 00:25:36,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-03 00:25:36,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:36,133 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:36,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-03 00:25:36,134 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:36,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:36,134 INFO L82 PathProgramCache]: Analyzing trace with hash 743790053, now seen corresponding path program 1 times [2021-05-03 00:25:36,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:36,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770356503] [2021-05-03 00:25:36,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:36,174 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_student_version_~i~1_10 v_student_version_~w_8) InVars {student_version_~i~1=v_student_version_~i~1_10, student_version_~w=v_student_version_~w_8} OutVars{student_version_~i~1=v_student_version_~i~1_10, student_version_~w=v_student_version_~w_8} AuxVars[] AssignedVars[] [2021-05-03 00:25:36,184 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:36,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:36,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:36,229 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:36,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:36,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:36,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:36,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-03 00:25:36,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:36,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:36,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:36,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:36,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:36,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:36,591 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:36,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770356503] [2021-05-03 00:25:36,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [770356503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:36,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:36,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-03 00:25:36,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439555225] [2021-05-03 00:25:36,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:25:36,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:36,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:25:36,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:25:36,594 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:36,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:36,971 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-03 00:25:36,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-03 00:25:36,972 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-03 00:25:36,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:36,973 INFO L225 Difference]: With dead ends: 56 [2021-05-03 00:25:36,973 INFO L226 Difference]: Without dead ends: 45 [2021-05-03 00:25:36,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 381.4ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:25:36,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-03 00:25:36,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-05-03 00:25:36,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:36,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-03 00:25:36,986 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 29 [2021-05-03 00:25:36,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:36,986 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-03 00:25:36,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:36,986 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-03 00:25:36,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-03 00:25:36,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:36,987 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:36,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-03 00:25:36,988 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:36,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:36,988 INFO L82 PathProgramCache]: Analyzing trace with hash 198429957, now seen corresponding path program 1 times [2021-05-03 00:25:36,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:36,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665766399] [2021-05-03 00:25:36,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:36,994 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_10 v_correct_version_~w_8) InVars {correct_version_~i~0=v_correct_version_~i~0_10, correct_version_~w=v_correct_version_~w_8} OutVars{correct_version_~i~0=v_correct_version_~i~0_10, correct_version_~w=v_correct_version_~w_8} AuxVars[] AssignedVars[] [2021-05-03 00:25:37,003 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:37,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:37,012 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:37,037 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:37,054 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:37,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:37,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:37,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:37,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:37,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:37,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:37,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:37,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:37,411 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:37,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665766399] [2021-05-03 00:25:37,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [665766399] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:37,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:37,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-03 00:25:37,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403687225] [2021-05-03 00:25:37,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:25:37,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:37,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:25:37,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:25:37,414 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:37,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:37,741 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-03 00:25:37,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-03 00:25:37,742 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-03 00:25:37,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:37,744 INFO L225 Difference]: With dead ends: 51 [2021-05-03 00:25:37,744 INFO L226 Difference]: Without dead ends: 42 [2021-05-03 00:25:37,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 365.7ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:25:37,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-03 00:25:37,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-03 00:25:37,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:37,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-03 00:25:37,766 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 29 [2021-05-03 00:25:37,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:37,766 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-03 00:25:37,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:37,767 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-03 00:25:37,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-03 00:25:37,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:37,774 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:37,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-03 00:25:37,774 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:37,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:37,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1589989783, now seen corresponding path program 1 times [2021-05-03 00:25:37,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:37,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116522023] [2021-05-03 00:25:37,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:37,784 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_14 v_correct_version_~w_9) InVars {correct_version_~i~0=v_correct_version_~i~0_14, correct_version_~w=v_correct_version_~w_9} OutVars{correct_version_~i~0=v_correct_version_~i~0_14, correct_version_~w=v_correct_version_~w_9} AuxVars[] AssignedVars[] [2021-05-03 00:25:37,790 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:37,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:37,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:37,823 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:37,842 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:37,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:37,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:37,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:37,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:37,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:37,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:37,995 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:37,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116522023] [2021-05-03 00:25:37,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2116522023] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:37,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:37,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-03 00:25:37,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843187841] [2021-05-03 00:25:37,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-03 00:25:37,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:37,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-03 00:25:37,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-03 00:25:37,998 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:38,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:38,211 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-05-03 00:25:38,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-03 00:25:38,212 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-05-03 00:25:38,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:38,213 INFO L225 Difference]: With dead ends: 58 [2021-05-03 00:25:38,213 INFO L226 Difference]: Without dead ends: 45 [2021-05-03 00:25:38,213 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 153.2ms TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-05-03 00:25:38,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-03 00:25:38,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-03 00:25:38,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-03 00:25:38,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-03 00:25:38,224 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2021-05-03 00:25:38,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:38,225 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-03 00:25:38,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:38,225 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-03 00:25:38,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-03 00:25:38,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:38,226 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:38,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-03 00:25:38,226 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:38,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:38,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1518564121, now seen corresponding path program 2 times [2021-05-03 00:25:38,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:38,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819244460] [2021-05-03 00:25:38,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:38,232 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_18 v_correct_version_~w_10) InVars {correct_version_~i~0=v_correct_version_~i~0_18, correct_version_~w=v_correct_version_~w_10} OutVars{correct_version_~i~0=v_correct_version_~i~0_18, correct_version_~w=v_correct_version_~w_10} AuxVars[] AssignedVars[] [2021-05-03 00:25:38,236 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:38,239 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:38,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:38,265 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:38,281 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:38,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:38,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:38,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:38,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:38,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:38,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:38,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:38,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:38,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:38,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:38,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:38,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:38,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:38,783 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:38,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819244460] [2021-05-03 00:25:38,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1819244460] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:38,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:38,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-03 00:25:38,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996333347] [2021-05-03 00:25:38,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-03 00:25:38,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:38,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-03 00:25:38,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:25:38,785 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:41,538 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:25:41,807 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-03 00:25:44,149 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 42 [2021-05-03 00:25:44,493 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 74 [2021-05-03 00:25:45,229 WARN L205 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 72 [2021-05-03 00:25:45,781 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:25:46,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:46,836 INFO L93 Difference]: Finished difference Result 97 states and 114 transitions. [2021-05-03 00:25:46,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:25:46,837 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-03 00:25:46,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:46,839 INFO L225 Difference]: With dead ends: 97 [2021-05-03 00:25:46,840 INFO L226 Difference]: Without dead ends: 66 [2021-05-03 00:25:46,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 2878.2ms TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2021-05-03 00:25:46,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-03 00:25:46,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-05-03 00:25:46,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 49 states have internal predecessors, (53), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-03 00:25:46,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-05-03 00:25:46,856 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 35 [2021-05-03 00:25:46,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:46,856 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-05-03 00:25:46,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:46,857 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-05-03 00:25:46,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-03 00:25:46,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:46,858 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:46,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-03 00:25:46,858 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:46,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:46,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1072065907, now seen corresponding path program 1 times [2021-05-03 00:25:46,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:46,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895764305] [2021-05-03 00:25:46,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:46,880 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_22 v_correct_version_~w_11) InVars {correct_version_~i~0=v_correct_version_~i~0_22, correct_version_~w=v_correct_version_~w_11} OutVars{correct_version_~i~0=v_correct_version_~i~0_22, correct_version_~w=v_correct_version_~w_11} AuxVars[] AssignedVars[] [2021-05-03 00:25:46,883 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:46,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:46,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:46,977 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:47,044 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:47,054 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_24 2) v_correct_version_~w_12) InVars {correct_version_~i~0=v_correct_version_~i~0_24, correct_version_~w=v_correct_version_~w_12} OutVars{correct_version_~i~0=v_correct_version_~i~0_24, correct_version_~w=v_correct_version_~w_12} AuxVars[] AssignedVars[] [2021-05-03 00:25:47,058 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:25:47,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:47,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:25:47,145 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:25:47,234 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:47,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:47,386 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:25:47,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:47,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:47,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:47,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:47,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:47,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:47,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:47,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:47,690 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:47,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895764305] [2021-05-03 00:25:47,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [895764305] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:47,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:47,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-03 00:25:47,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867864807] [2021-05-03 00:25:47,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-03 00:25:47,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:47,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-03 00:25:47,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-03 00:25:47,704 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:47,959 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:25:48,363 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:25:48,553 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:25:48,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:48,956 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-05-03 00:25:48,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-03 00:25:48,956 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 37 [2021-05-03 00:25:48,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:48,957 INFO L225 Difference]: With dead ends: 69 [2021-05-03 00:25:48,958 INFO L226 Difference]: Without dead ends: 60 [2021-05-03 00:25:48,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1100.5ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:25:48,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-03 00:25:48,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-03 00:25:48,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 49 states have internal predecessors, (52), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-03 00:25:48,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2021-05-03 00:25:48,970 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 37 [2021-05-03 00:25:48,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:48,970 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2021-05-03 00:25:48,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-03 00:25:48,971 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2021-05-03 00:25:48,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-03 00:25:48,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:48,973 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:48,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-03 00:25:48,973 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:48,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:48,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1752124277, now seen corresponding path program 1 times [2021-05-03 00:25:48,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:48,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850492266] [2021-05-03 00:25:48,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:48,991 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_29 v_correct_version_~w_13) InVars {correct_version_~i~0=v_correct_version_~i~0_29, correct_version_~w=v_correct_version_~w_13} OutVars{correct_version_~i~0=v_correct_version_~i~0_29, correct_version_~w=v_correct_version_~w_13} AuxVars[] AssignedVars[] [2021-05-03 00:25:49,004 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:49,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:49,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:49,092 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:49,154 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:49,157 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_31 2) v_correct_version_~w_14) InVars {correct_version_~i~0=v_correct_version_~i~0_31, correct_version_~w=v_correct_version_~w_14} OutVars{correct_version_~i~0=v_correct_version_~i~0_31, correct_version_~w=v_correct_version_~w_14} AuxVars[] AssignedVars[] [2021-05-03 00:25:49,158 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:25:49,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:49,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:25:49,248 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:25:49,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:49,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:49,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:49,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:49,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:49,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:50,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:50,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:50,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:50,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:50,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:50,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850492266] [2021-05-03 00:25:50,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [850492266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:50,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:50,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-03 00:25:50,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263108529] [2021-05-03 00:25:50,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:25:50,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:50,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:25:50,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:25:50,543 INFO L87 Difference]: Start difference. First operand 60 states and 69 transitions. Second operand has 15 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:50,794 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:25:51,451 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:25:51,764 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-03 00:25:52,107 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-03 00:25:52,411 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-03 00:25:53,011 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-03 00:25:53,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:25:53,659 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2021-05-03 00:25:53,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:25:53,659 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-03 00:25:53,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:25:53,660 INFO L225 Difference]: With dead ends: 68 [2021-05-03 00:25:53,660 INFO L226 Difference]: Without dead ends: 58 [2021-05-03 00:25:53,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 2870.4ms TimeCoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2021-05-03 00:25:53,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-03 00:25:53,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2021-05-03 00:25:53,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 38 states have internal predecessors, (40), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:25:53,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2021-05-03 00:25:53,672 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 37 [2021-05-03 00:25:53,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:25:53,672 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2021-05-03 00:25:53,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:53,672 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2021-05-03 00:25:53,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-03 00:25:53,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:25:53,673 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:25:53,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-03 00:25:53,673 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:25:53,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:25:53,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1449963591, now seen corresponding path program 3 times [2021-05-03 00:25:53,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:25:53,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459383317] [2021-05-03 00:25:53,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:25:53,694 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_36 v_correct_version_~w_15) InVars {correct_version_~i~0=v_correct_version_~i~0_36, correct_version_~w=v_correct_version_~w_15} OutVars{correct_version_~i~0=v_correct_version_~i~0_36, correct_version_~w=v_correct_version_~w_15} AuxVars[] AssignedVars[] [2021-05-03 00:25:53,697 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:25:53,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:53,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:25:53,811 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:25:53,873 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:53,882 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_38 2) v_correct_version_~w_16) InVars {correct_version_~i~0=v_correct_version_~i~0_38, correct_version_~w=v_correct_version_~w_16} OutVars{correct_version_~i~0=v_correct_version_~i~0_38, correct_version_~w=v_correct_version_~w_16} AuxVars[] AssignedVars[] [2021-05-03 00:25:53,884 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:25:53,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:25:53,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:25:53,978 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:25:54,048 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:25:54,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:54,208 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 20 [2021-05-03 00:25:54,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:25:54,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:54,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:25:54,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:54,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:25:54,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:25:55,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:25:55,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:55,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:56,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:56,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:56,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:25:56,675 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:25:56,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459383317] [2021-05-03 00:25:56,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1459383317] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:25:56,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:25:56,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-03 00:25:56,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351104432] [2021-05-03 00:25:56,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-03 00:25:56,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:25:56,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-03 00:25:56,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:25:56,678 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:25:57,380 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:25:59,833 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:26:00,206 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:26:00,661 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 71 [2021-05-03 00:26:01,375 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:26:01,644 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:26:01,853 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:26:02,368 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:26:02,662 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-03 00:26:02,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:26:02,893 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2021-05-03 00:26:02,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:26:02,894 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-03 00:26:02,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:26:02,895 INFO L225 Difference]: With dead ends: 92 [2021-05-03 00:26:02,895 INFO L226 Difference]: Without dead ends: 65 [2021-05-03 00:26:02,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 5244.2ms TimeCoverageRelationStatistics Valid=156, Invalid=1104, Unknown=0, NotChecked=0, Total=1260 [2021-05-03 00:26:02,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-03 00:26:02,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 51. [2021-05-03 00:26:02,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 41 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:26:02,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-05-03 00:26:02,906 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 39 [2021-05-03 00:26:02,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:26:02,906 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-05-03 00:26:02,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:26:02,906 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-05-03 00:26:02,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-03 00:26:02,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:26:02,907 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:26:02,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-03 00:26:02,907 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:26:02,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:26:02,907 INFO L82 PathProgramCache]: Analyzing trace with hash 2030931829, now seen corresponding path program 2 times [2021-05-03 00:26:02,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:26:02,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987057429] [2021-05-03 00:26:02,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:26:02,930 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_43 v_correct_version_~w_17) InVars {correct_version_~i~0=v_correct_version_~i~0_43, correct_version_~w=v_correct_version_~w_17} OutVars{correct_version_~i~0=v_correct_version_~i~0_43, correct_version_~w=v_correct_version_~w_17} AuxVars[] AssignedVars[] [2021-05-03 00:26:02,932 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:26:02,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:26:02,948 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:26:03,000 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:26:03,068 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:26:03,070 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_45 2) v_correct_version_~w_18) InVars {correct_version_~i~0=v_correct_version_~i~0_45, correct_version_~w=v_correct_version_~w_18} OutVars{correct_version_~i~0=v_correct_version_~i~0_45, correct_version_~w=v_correct_version_~w_18} AuxVars[] AssignedVars[] [2021-05-03 00:26:03,071 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:26:03,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:26:03,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:26:03,139 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:26:03,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:26:03,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:26:03,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:26:03,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:26:03,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:26:03,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:26:03,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:26:03,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:26:04,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:26:04,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:06,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:06,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:10,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:15,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:26,470 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:26:26,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:26,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:27,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:26:27,454 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2021-05-03 00:26:27,455 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:26:27,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987057429] [2021-05-03 00:26:27,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1987057429] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:26:27,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:26:27,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-03 00:26:27,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789384346] [2021-05-03 00:26:27,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-03 00:26:27,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:26:27,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-03 00:26:27,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=557, Unknown=10, NotChecked=0, Total=650 [2021-05-03 00:26:27,457 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:26:27,932 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:26:34,455 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-03 00:26:52,106 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-03 00:27:06,013 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-03 00:27:23,461 WARN L205 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-03 00:27:30,908 WARN L205 SmtUtils]: Spent 634.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 77 [2021-05-03 00:27:50,407 WARN L205 SmtUtils]: Spent 9.89 s on a formula simplification. DAG size of input: 96 DAG size of output: 85 [2021-05-03 00:27:58,153 WARN L205 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-03 00:27:58,876 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:27:59,315 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:27:59,877 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-03 00:28:00,575 WARN L205 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-03 00:28:01,299 WARN L205 SmtUtils]: Spent 545.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2021-05-03 00:28:01,774 WARN L205 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-03 00:28:02,542 WARN L205 SmtUtils]: Spent 619.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 62 [2021-05-03 00:28:03,568 WARN L205 SmtUtils]: Spent 740.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 68 [2021-05-03 00:28:04,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:28:04,161 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2021-05-03 00:28:04,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-03 00:28:04,167 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-03 00:28:04,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:28:04,168 INFO L225 Difference]: With dead ends: 63 [2021-05-03 00:28:04,169 INFO L226 Difference]: Without dead ends: 51 [2021-05-03 00:28:04,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 81705.8ms TimeCoverageRelationStatistics Valid=217, Invalid=1476, Unknown=29, NotChecked=0, Total=1722 [2021-05-03 00:28:04,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-03 00:28:04,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-03 00:28:04,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.105263157894737) internal successors, (42), 40 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:28:04,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2021-05-03 00:28:04,182 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 39 [2021-05-03 00:28:04,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:28:04,182 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2021-05-03 00:28:04,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:28:04,182 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2021-05-03 00:28:04,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-03 00:28:04,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:28:04,183 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:28:04,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-03 00:28:04,183 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:28:04,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:28:04,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1355746345, now seen corresponding path program 4 times [2021-05-03 00:28:04,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:28:04,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581845771] [2021-05-03 00:28:04,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:28:04,217 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_50 v_correct_version_~w_19) InVars {correct_version_~i~0=v_correct_version_~i~0_50, correct_version_~w=v_correct_version_~w_19} OutVars{correct_version_~i~0=v_correct_version_~i~0_50, correct_version_~w=v_correct_version_~w_19} AuxVars[] AssignedVars[] [2021-05-03 00:28:04,221 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:28:04,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:28:04,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:28:04,440 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:28:04,665 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:28:04,672 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:28:04,689 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_52 2) v_correct_version_~w_20) InVars {correct_version_~i~0=v_correct_version_~i~0_52, correct_version_~w=v_correct_version_~w_20} OutVars{correct_version_~i~0=v_correct_version_~i~0_52, correct_version_~w=v_correct_version_~w_20} AuxVars[] AssignedVars[] [2021-05-03 00:28:04,693 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:28:04,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:28:04,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:28:04,912 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:28:05,112 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:28:05,118 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:28:05,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:28:05,361 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-03 00:28:05,645 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:28:05,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:28:05,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:28:05,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:28:05,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:28:05,976 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2021-05-03 00:28:06,259 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-05-03 00:28:06,704 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-03 00:28:06,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:28:06,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:28:08,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:28:08,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:10,460 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:28:14,798 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:28:14,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:17,227 WARN L205 SmtUtils]: Spent 2.13 s on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:28:17,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:21,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:26,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:36,589 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:28:36,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:28:47,142 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-03 00:28:47,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:03,787 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:29:04,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:04,691 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2021-05-03 00:29:04,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:05,159 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-03 00:29:05,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:05,771 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 10 [2021-05-03 00:29:05,773 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:05,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581845771] [2021-05-03 00:29:05,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1581845771] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:05,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:05,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-03 00:29:05,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489663182] [2021-05-03 00:29:05,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-03 00:29:05,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:05,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-03 00:29:05,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=592, Unknown=23, NotChecked=0, Total=702 [2021-05-03 00:29:05,778 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:29:06,496 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:29:17,273 WARN L205 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-03 00:29:36,686 WARN L205 SmtUtils]: Spent 2.42 s on a formula simplification that was a NOOP. DAG size: 75 [2021-05-03 00:29:49,407 WARN L205 SmtUtils]: Spent 398.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2021-05-03 00:30:13,500 WARN L205 SmtUtils]: Spent 455.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-03 00:30:34,703 WARN L205 SmtUtils]: Spent 423.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-03 00:30:53,936 WARN L205 SmtUtils]: Spent 429.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-03 00:31:21,814 WARN L205 SmtUtils]: Spent 601.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2021-05-03 00:31:38,247 WARN L205 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:32:08,088 WARN L205 SmtUtils]: Spent 547.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-03 00:32:08,651 WARN L205 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-03 00:32:09,368 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:32:09,842 WARN L205 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:32:10,425 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:32:10,994 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:32:11,560 WARN L205 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:32:12,021 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:32:13,113 WARN L205 SmtUtils]: Spent 758.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-03 00:32:14,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:14,222 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2021-05-03 00:32:14,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-03 00:32:14,238 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-05-03 00:32:14,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:14,239 INFO L225 Difference]: With dead ends: 80 [2021-05-03 00:32:14,239 INFO L226 Difference]: Without dead ends: 71 [2021-05-03 00:32:14,240 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 148455.6ms TimeCoverageRelationStatistics Valid=216, Invalid=1704, Unknown=60, NotChecked=0, Total=1980 [2021-05-03 00:32:14,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-03 00:32:14,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 53. [2021-05-03 00:32:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 43 states have internal predecessors, (46), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:32:14,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-05-03 00:32:14,257 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 41 [2021-05-03 00:32:14,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:14,257 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-05-03 00:32:14,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:32:14,257 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-05-03 00:32:14,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-03 00:32:14,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:14,258 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:14,258 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-03 00:32:14,258 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:14,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:14,259 INFO L82 PathProgramCache]: Analyzing trace with hash 2125149075, now seen corresponding path program 3 times [2021-05-03 00:32:14,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:14,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126588305] [2021-05-03 00:32:14,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:14,296 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_58 v_correct_version_~w_21) InVars {correct_version_~i~0=v_correct_version_~i~0_58, correct_version_~w=v_correct_version_~w_21} OutVars{correct_version_~i~0=v_correct_version_~i~0_58, correct_version_~w=v_correct_version_~w_21} AuxVars[] AssignedVars[] [2021-05-03 00:32:14,302 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:32:14,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:14,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:32:14,617 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:32:14,890 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:32:14,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:14,910 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_60 2) v_correct_version_~w_22) InVars {correct_version_~i~0=v_correct_version_~i~0_60, correct_version_~w=v_correct_version_~w_22} OutVars{correct_version_~i~0=v_correct_version_~i~0_60, correct_version_~w=v_correct_version_~w_22} AuxVars[] AssignedVars[] [2021-05-03 00:32:14,915 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:32:14,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:14,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:32:15,206 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:32:15,462 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:32:15,472 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:15,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:15,836 WARN L205 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 18 [2021-05-03 00:32:16,160 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:32:16,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:16,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:32:16,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:16,487 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2021-05-03 00:32:16,890 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2021-05-03 00:32:17,163 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-05-03 00:32:17,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:32:17,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:19,027 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2021-05-03 00:32:19,506 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2021-05-03 00:32:19,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:19,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:32:20,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:32:22,461 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-05-03 00:32:22,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:32:22,894 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:32:22,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:32:23,361 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:32:23,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:32:23,923 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2021-05-03 00:32:23,926 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:23,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126588305] [2021-05-03 00:32:23,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126588305] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:23,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:23,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-03 00:32:23,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458176096] [2021-05-03 00:32:23,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-03 00:32:23,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:23,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-03 00:32:23,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-05-03 00:32:23,929 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:32:24,654 WARN L205 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:32:25,201 WARN L205 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:32:27,948 WARN L205 SmtUtils]: Spent 334.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:32:28,679 WARN L205 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:32:29,251 WARN L205 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:32:32,019 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:32:34,896 WARN L205 SmtUtils]: Spent 522.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-03 00:32:40,732 WARN L205 SmtUtils]: Spent 3.07 s on a formula simplification. DAG size of input: 90 DAG size of output: 79 [2021-05-03 00:32:46,600 WARN L205 SmtUtils]: Spent 474.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-03 00:32:47,407 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:32:47,958 WARN L205 SmtUtils]: Spent 350.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:32:48,654 WARN L205 SmtUtils]: Spent 334.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-03 00:32:49,309 WARN L205 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-03 00:32:50,190 WARN L205 SmtUtils]: Spent 688.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2021-05-03 00:32:50,817 WARN L205 SmtUtils]: Spent 364.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-03 00:32:51,753 WARN L205 SmtUtils]: Spent 724.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 62 [2021-05-03 00:32:53,130 WARN L205 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 70 DAG size of output: 68 [2021-05-03 00:32:53,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:53,881 INFO L93 Difference]: Finished difference Result 71 states and 77 transitions. [2021-05-03 00:32:53,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-03 00:32:53,898 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-05-03 00:32:53,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:53,900 INFO L225 Difference]: With dead ends: 71 [2021-05-03 00:32:53,900 INFO L226 Difference]: Without dead ends: 60 [2021-05-03 00:32:53,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 22633.5ms TimeCoverageRelationStatistics Valid=221, Invalid=1584, Unknown=1, NotChecked=0, Total=1806 [2021-05-03 00:32:53,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-03 00:32:53,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-05-03 00:32:53,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 46 states have internal predecessors, (50), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:32:53,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2021-05-03 00:32:53,919 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 41 [2021-05-03 00:32:53,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:53,919 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2021-05-03 00:32:53,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:32:53,919 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2021-05-03 00:32:53,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-03 00:32:53,920 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:53,920 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:53,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-03 00:32:53,920 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:53,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:53,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1049593177, now seen corresponding path program 5 times [2021-05-03 00:32:53,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:53,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283306016] [2021-05-03 00:32:53,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:53,956 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_66 v_correct_version_~w_23) InVars {correct_version_~i~0=v_correct_version_~i~0_66, correct_version_~w=v_correct_version_~w_23} OutVars{correct_version_~i~0=v_correct_version_~i~0_66, correct_version_~w=v_correct_version_~w_23} AuxVars[] AssignedVars[] [2021-05-03 00:32:53,963 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:32:53,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:54,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:32:54,291 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:32:54,597 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:32:54,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:54,620 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_68 2) v_correct_version_~w_24) InVars {correct_version_~i~0=v_correct_version_~i~0_68, correct_version_~w=v_correct_version_~w_24} OutVars{correct_version_~i~0=v_correct_version_~i~0_68, correct_version_~w=v_correct_version_~w_24} AuxVars[] AssignedVars[] [2021-05-03 00:32:54,625 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:32:54,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:54,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:32:54,940 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:32:55,237 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:32:55,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:55,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:55,547 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-03 00:32:55,865 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:32:55,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:55,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:55,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:32:55,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:56,289 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2021-05-03 00:32:56,633 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-05-03 00:32:57,175 WARN L205 SmtUtils]: Spent 408.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-03 00:32:57,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:32:57,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:59,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:59,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:01,575 WARN L205 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:33:08,081 WARN L205 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:33:08,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:10,629 WARN L205 SmtUtils]: Spent 2.15 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-03 00:33:10,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:15,205 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:33:15,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:19,733 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-03 00:33:19,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:32,525 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-03 00:33:32,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:33:45,407 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:33:45,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:34:02,399 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-03 00:34:02,856 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2021-05-03 00:34:02,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:34:03,428 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2021-05-03 00:34:03,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:34:04,049 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-03 00:34:04,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:34:04,804 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 10 [2021-05-03 00:34:04,808 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:34:04,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283306016] [2021-05-03 00:34:04,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1283306016] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:34:04,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:34:04,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-03 00:34:04,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079077400] [2021-05-03 00:34:04,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-03 00:34:04,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:34:04,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-03 00:34:04,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=642, Unknown=25, NotChecked=0, Total=756 [2021-05-03 00:34:04,810 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand has 26 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 24 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:34:06,135 WARN L205 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:34:21,489 WARN L205 SmtUtils]: Spent 2.59 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-03 00:34:43,005 WARN L205 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-03 00:35:00,134 WARN L205 SmtUtils]: Spent 513.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-03 00:35:21,523 WARN L205 SmtUtils]: Spent 575.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-03 00:35:44,767 WARN L205 SmtUtils]: Spent 632.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2021-05-03 00:36:12,257 WARN L205 SmtUtils]: Spent 687.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2021-05-03 00:36:35,418 WARN L205 SmtUtils]: Spent 5.93 s on a formula simplification. DAG size of input: 89 DAG size of output: 82 [2021-05-03 00:36:52,269 WARN L205 SmtUtils]: Spent 817.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-03 00:37:10,357 WARN L205 SmtUtils]: Spent 992.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-03 00:37:22,482 WARN L205 SmtUtils]: Spent 796.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:37:23,674 WARN L205 SmtUtils]: Spent 743.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-03 00:37:38,821 WARN L205 SmtUtils]: Spent 444.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:37:39,713 WARN L205 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:37:40,914 WARN L205 SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:37:42,087 WARN L205 SmtUtils]: Spent 505.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:37:43,294 WARN L205 SmtUtils]: Spent 494.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:37:44,994 WARN L205 SmtUtils]: Spent 532.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:37:46,171 WARN L205 SmtUtils]: Spent 552.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-03 00:37:48,501 WARN L205 SmtUtils]: Spent 1.23 s on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-03 00:37:52,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:52,104 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2021-05-03 00:37:52,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-03 00:37:52,137 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 24 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-03 00:37:52,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:52,138 INFO L225 Difference]: With dead ends: 92 [2021-05-03 00:37:52,138 INFO L226 Difference]: Without dead ends: 83 [2021-05-03 00:37:52,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 180788.7ms TimeCoverageRelationStatistics Valid=231, Invalid=1956, Unknown=69, NotChecked=0, Total=2256 [2021-05-03 00:37:52,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-03 00:37:52,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 58. [2021-05-03 00:37:52,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 48 states have internal predecessors, (53), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-03 00:37:52,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2021-05-03 00:37:52,161 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 43 [2021-05-03 00:37:52,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:52,161 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2021-05-03 00:37:52,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 24 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:37:52,161 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2021-05-03 00:37:52,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-03 00:37:52,162 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:52,162 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:52,162 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-03 00:37:52,162 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:52,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:52,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1821358031, now seen corresponding path program 4 times [2021-05-03 00:37:52,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:52,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196131439] [2021-05-03 00:37:52,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:52,225 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_74 v_correct_version_~w_25) InVars {correct_version_~i~0=v_correct_version_~i~0_74, correct_version_~w=v_correct_version_~w_25} OutVars{correct_version_~i~0=v_correct_version_~i~0_74, correct_version_~w=v_correct_version_~w_25} AuxVars[] AssignedVars[] [2021-05-03 00:37:52,237 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size [2021-05-03 00:37:52,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:37:52,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-03 00:37:52,763 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 87.7 percent of original size 50 [2021-05-03 00:37:53,244 WARN L205 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:37:53,266 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:37:53,296 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< (+ v_correct_version_~i~0_76 2) v_correct_version_~w_26) InVars {correct_version_~i~0=v_correct_version_~i~0_76, correct_version_~w=v_correct_version_~w_26} OutVars{correct_version_~i~0=v_correct_version_~i~0_76, correct_version_~w=v_correct_version_~w_26} AuxVars[] AssignedVars[] [2021-05-03 00:37:53,306 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size [2021-05-03 00:37:53,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:37:53,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-03 00:37:53,854 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 88.9 percent of original size 56 [2021-05-03 00:37:54,355 WARN L205 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:37:54,378 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:37:54,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:55,095 WARN L205 SmtUtils]: Spent 591.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 21 [2021-05-03 00:37:55,619 WARN L205 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-03 00:37:55,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:55,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:55,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-03 00:37:55,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:56,139 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2021-05-03 00:37:56,550 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2021-05-03 00:37:56,973 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-05-03 00:37:57,287 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2021-05-03 00:37:57,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-03 00:37:57,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:57,963 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2021-05-03 00:37:58,452 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2021-05-03 00:37:58,964 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-03 00:37:59,539 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2021-05-03 00:38:00,308 WARN L205 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2021-05-03 00:38:01,092 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2021-05-03 00:38:01,580 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2021-05-03 00:38:01,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:38:01,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:01,740 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-03 00:38:02,392 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-03 00:38:02,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:03,244 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-03 00:38:03,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:08,343 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-03 00:38:08,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:13,323 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-03 00:38:13,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:26,810 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:38:26,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:39,234 WARN L205 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-03 00:38:39,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:38:58,161 WARN L205 SmtUtils]: Spent 473.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:38:58,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:39:20,518 WARN L205 SmtUtils]: Spent 491.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-03 00:39:20,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:39:52,483 WARN L205 SmtUtils]: Spent 624.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-03 00:39:54,559 WARN L205 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-05-03 00:39:54,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:39:56,543 WARN L205 SmtUtils]: Spent 420.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2021-05-03 00:39:56,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:39:58,782 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-03 00:39:58,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:40:01,080 WARN L205 SmtUtils]: Spent 745.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2021-05-03 00:40:01,097 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:01,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1196131439] [2021-05-03 00:40:01,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1196131439] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:01,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:01,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-03 00:40:01,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885038715] [2021-05-03 00:40:01,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-03 00:40:01,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:01,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-03 00:40:01,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=724, Unknown=45, NotChecked=0, Total=870 [2021-05-03 00:40:01,099 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 28 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 26 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-03 00:40:05,349 WARN L205 SmtUtils]: Spent 908.00 ms on a formula simplification that was a NOOP. DAG size: 40