/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 06:36:05,180 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 06:36:05,183 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 06:36:05,224 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 06:36:05,225 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 06:36:05,226 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 06:36:05,228 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 06:36:05,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 06:36:05,239 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 06:36:05,241 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 06:36:05,242 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 06:36:05,244 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 06:36:05,244 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 06:36:05,246 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 06:36:05,247 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 06:36:05,249 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 06:36:05,250 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 06:36:05,251 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 06:36:05,253 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 06:36:05,256 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 06:36:05,257 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 06:36:05,261 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 06:36:05,262 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 06:36:05,267 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 06:36:05,274 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 06:36:05,296 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 06:36:05,298 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 06:36:05,301 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 06:36:05,302 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 06:36:05,318 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 06:36:05,318 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 06:36:05,320 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 06:36:05,320 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 06:36:05,320 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 06:36:05,320 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 06:36:05,321 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 06:36:05,321 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 06:36:05,321 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 06:36:05,321 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 06:36:05,321 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 06:36:05,322 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 06:36:05,322 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 06:36:05,322 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 06:36:05,322 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 06:36:05,322 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 06:36:05,323 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 06:36:05,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 06:36:05,323 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:36:05,323 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 06:36:05,323 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 06:36:05,324 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 06:36:05,324 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 06:36:05,757 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 06:36:05,806 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 06:36:05,809 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 06:36:05,811 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 06:36:05,812 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 06:36:05,813 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-11-07 06:36:05,906 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26d4d764f/477e5acee17740dfaa6378b99f2bb434/FLAG77547149d [2020-11-07 06:36:06,457 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 06:36:06,458 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-11-07 06:36:06,466 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26d4d764f/477e5acee17740dfaa6378b99f2bb434/FLAG77547149d [2020-11-07 06:36:06,864 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26d4d764f/477e5acee17740dfaa6378b99f2bb434 [2020-11-07 06:36:06,869 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 06:36:06,879 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 06:36:06,882 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 06:36:06,882 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 06:36:06,886 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 06:36:06,887 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:06,890 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ddc771c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:06, skipping insertion in model container [2020-11-07 06:36:06,891 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:36:06" (1/1) ... [2020-11-07 06:36:06,900 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 06:36:06,915 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 06:36:07,086 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:36:07,100 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 06:36:07,118 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:36:07,136 INFO L208 MainTranslator]: Completed translation [2020-11-07 06:36:07,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07 WrapperNode [2020-11-07 06:36:07,137 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 06:36:07,138 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 06:36:07,138 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 06:36:07,139 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 06:36:07,154 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,170 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,174 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (1/1) ... [2020-11-07 06:36:07,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 06:36:07,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 06:36:07,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 06:36:07,179 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 06:36:07,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (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 [2020-11-07 06:36:07,271 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 06:36:07,271 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 06:36:07,272 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 06:36:07,272 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-07 06:36:07,272 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 06:36:07,273 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 06:36:07,273 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 06:36:07,273 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 06:36:07,274 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 06:36:07,274 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-07 06:36:07,275 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 06:36:07,275 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 06:36:07,275 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 06:36:07,275 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 06:36:07,275 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 06:36:07,276 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 06:36:07,276 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 06:36:07,643 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 06:36:07,643 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-07 06:36:07,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:36:07 BoogieIcfgContainer [2020-11-07 06:36:07,646 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 06:36:07,648 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 06:36:07,648 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 06:36:07,652 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 06:36:07,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 06:36:06" (1/3) ... [2020-11-07 06:36:07,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19d6ab27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:36:07, skipping insertion in model container [2020-11-07 06:36:07,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:36:07" (2/3) ... [2020-11-07 06:36:07,654 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19d6ab27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:36:07, skipping insertion in model container [2020-11-07 06:36:07,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:36:07" (3/3) ... [2020-11-07 06:36:07,656 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-11-07 06:36:07,672 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 06:36:07,675 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 06:36:07,694 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 06:36:07,720 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 06:36:07,721 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 06:36:07,721 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 06:36:07,721 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 06:36:07,721 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 06:36:07,721 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 06:36:07,722 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 06:36:07,722 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 06:36:07,738 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-11-07 06:36:07,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-07 06:36:07,748 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:07,749 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:07,749 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:07,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:07,771 INFO L82 PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times [2020-11-07 06:36:07,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:07,781 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248431865] [2020-11-07 06:36:07,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:07,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:08,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:08,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:08,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248431865] [2020-11-07 06:36:08,171 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:36:08,172 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 06:36:08,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78802723] [2020-11-07 06:36:08,182 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 06:36:08,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:08,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 06:36:08,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:36:08,208 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 6 states. [2020-11-07 06:36:08,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:08,714 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-11-07 06:36:08,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:36:08,717 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-11-07 06:36:08,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:08,742 INFO L225 Difference]: With dead ends: 49 [2020-11-07 06:36:08,743 INFO L226 Difference]: Without dead ends: 28 [2020-11-07 06:36:08,747 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-11-07 06:36:08,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-07 06:36:08,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-11-07 06:36:08,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-07 06:36:08,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-11-07 06:36:08,821 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20 [2020-11-07 06:36:08,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:08,822 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-11-07 06:36:08,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 06:36:08,823 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-11-07 06:36:08,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-07 06:36:08,825 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:08,826 INFO L422 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] [2020-11-07 06:36:08,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 06:36:08,826 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:08,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:08,829 INFO L82 PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times [2020-11-07 06:36:08,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:08,831 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749208317] [2020-11-07 06:36:08,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:08,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:09,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:09,055 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749208317] [2020-11-07 06:36:09,055 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:09,055 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-11-07 06:36:09,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022110960] [2020-11-07 06:36:09,057 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-07 06:36:09,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:09,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-07 06:36:09,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-07 06:36:09,059 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2020-11-07 06:36:09,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:09,366 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-11-07 06:36:09,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 06:36:09,367 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-11-07 06:36:09,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:09,369 INFO L225 Difference]: With dead ends: 39 [2020-11-07 06:36:09,369 INFO L226 Difference]: Without dead ends: 33 [2020-11-07 06:36:09,370 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:36:09,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-07 06:36:09,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-11-07 06:36:09,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-11-07 06:36:09,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-11-07 06:36:09,383 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25 [2020-11-07 06:36:09,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:09,383 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-11-07 06:36:09,383 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-07 06:36:09,383 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-11-07 06:36:09,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-07 06:36:09,385 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:09,385 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:09,385 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 06:36:09,385 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:09,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:09,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times [2020-11-07 06:36:09,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:09,387 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291711069] [2020-11-07 06:36:09,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:09,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:09,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:09,604 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:09,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291711069] [2020-11-07 06:36:09,605 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:09,605 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:36:09,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885346202] [2020-11-07 06:36:09,606 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:36:09,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:09,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:36:09,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:36:09,608 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 10 states. [2020-11-07 06:36:10,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:10,075 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-11-07 06:36:10,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-07 06:36:10,076 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-11-07 06:36:10,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:10,077 INFO L225 Difference]: With dead ends: 44 [2020-11-07 06:36:10,077 INFO L226 Difference]: Without dead ends: 38 [2020-11-07 06:36:10,078 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2020-11-07 06:36:10,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-07 06:36:10,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-11-07 06:36:10,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-07 06:36:10,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-11-07 06:36:10,091 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30 [2020-11-07 06:36:10,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:10,092 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-11-07 06:36:10,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:36:10,092 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-11-07 06:36:10,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-11-07 06:36:10,093 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:10,094 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:10,094 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 06:36:10,094 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:10,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:10,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times [2020-11-07 06:36:10,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:10,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646924452] [2020-11-07 06:36:10,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:10,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:10,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,340 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:10,340 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646924452] [2020-11-07 06:36:10,341 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:10,341 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-11-07 06:36:10,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361563495] [2020-11-07 06:36:10,342 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-07 06:36:10,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:10,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-07 06:36:10,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:36:10,343 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 12 states. [2020-11-07 06:36:11,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:11,013 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-11-07 06:36:11,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-07 06:36:11,014 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2020-11-07 06:36:11,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:11,015 INFO L225 Difference]: With dead ends: 49 [2020-11-07 06:36:11,015 INFO L226 Difference]: Without dead ends: 43 [2020-11-07 06:36:11,016 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-11-07 06:36:11,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-07 06:36:11,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-11-07 06:36:11,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-07 06:36:11,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-11-07 06:36:11,030 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35 [2020-11-07 06:36:11,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:11,031 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-11-07 06:36:11,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-07 06:36:11,031 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-11-07 06:36:11,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-07 06:36:11,032 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:11,033 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:11,033 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 06:36:11,033 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:11,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:11,034 INFO L82 PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times [2020-11-07 06:36:11,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:11,035 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578969511] [2020-11-07 06:36:11,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:11,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:11,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:11,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:11,331 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:11,331 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578969511] [2020-11-07 06:36:11,332 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:11,332 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-11-07 06:36:11,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590196563] [2020-11-07 06:36:11,333 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-07 06:36:11,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:11,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-07 06:36:11,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2020-11-07 06:36:11,334 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 14 states. [2020-11-07 06:36:12,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:12,265 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-11-07 06:36:12,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-07 06:36:12,265 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 40 [2020-11-07 06:36:12,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:12,267 INFO L225 Difference]: With dead ends: 54 [2020-11-07 06:36:12,267 INFO L226 Difference]: Without dead ends: 48 [2020-11-07 06:36:12,270 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2020-11-07 06:36:12,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-11-07 06:36:12,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-11-07 06:36:12,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-07 06:36:12,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-11-07 06:36:12,312 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40 [2020-11-07 06:36:12,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:12,314 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-11-07 06:36:12,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-07 06:36:12,315 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-11-07 06:36:12,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-07 06:36:12,317 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:12,317 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:12,317 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 06:36:12,318 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:12,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:12,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times [2020-11-07 06:36:12,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:12,322 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508570112] [2020-11-07 06:36:12,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:12,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:12,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:12,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:12,777 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:12,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508570112] [2020-11-07 06:36:12,778 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:12,778 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-11-07 06:36:12,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739574250] [2020-11-07 06:36:12,779 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-07 06:36:12,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:12,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-07 06:36:12,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2020-11-07 06:36:12,780 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 16 states. [2020-11-07 06:36:13,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:13,962 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-11-07 06:36:13,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-07 06:36:13,966 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-11-07 06:36:13,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:13,967 INFO L225 Difference]: With dead ends: 59 [2020-11-07 06:36:13,967 INFO L226 Difference]: Without dead ends: 53 [2020-11-07 06:36:13,968 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2020-11-07 06:36:13,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-07 06:36:13,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-11-07 06:36:13,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-11-07 06:36:13,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-11-07 06:36:13,996 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45 [2020-11-07 06:36:13,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:13,996 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-11-07 06:36:13,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-07 06:36:13,997 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-11-07 06:36:13,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-11-07 06:36:13,998 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:13,998 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:13,998 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 06:36:13,998 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:13,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:13,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times [2020-11-07 06:36:13,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:14,000 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748702258] [2020-11-07 06:36:14,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:14,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:36:14,020 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:36:14,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 06:36:14,041 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 06:36:14,086 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 06:36:14,086 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 06:36:14,086 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-07 06:36:14,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 06:36:14 BoogieIcfgContainer [2020-11-07 06:36:14,150 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 06:36:14,153 INFO L168 Benchmark]: Toolchain (without parser) took 7279.72 ms. Allocated memory was 152.0 MB in the beginning and 219.2 MB in the end (delta: 67.1 MB). Free memory was 127.9 MB in the beginning and 124.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 71.6 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,154 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 152.0 MB. Free memory is still 124.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 06:36:14,155 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.70 ms. Allocated memory is still 152.0 MB. Free memory was 127.3 MB in the beginning and 118.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,156 INFO L168 Benchmark]: Boogie Preprocessor took 39.60 ms. Allocated memory is still 152.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,157 INFO L168 Benchmark]: RCFGBuilder took 467.38 ms. Allocated memory is still 152.0 MB. Free memory was 116.8 MB in the beginning and 104.4 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,158 INFO L168 Benchmark]: TraceAbstraction took 6502.37 ms. Allocated memory was 152.0 MB in the beginning and 219.2 MB in the end (delta: 67.1 MB). Free memory was 104.0 MB in the beginning and 124.8 MB in the end (delta: -20.9 MB). Peak memory consumption was 47.5 MB. Max. memory is 8.0 GB. [2020-11-07 06:36:14,163 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 152.0 MB. Free memory is still 124.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 255.70 ms. Allocated memory is still 152.0 MB. Free memory was 127.3 MB in the beginning and 118.3 MB in the end (delta: 9.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.60 ms. Allocated memory is still 152.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 467.38 ms. Allocated memory is still 152.0 MB. Free memory was 116.8 MB in the beginning and 104.4 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6502.37 ms. Allocated memory was 152.0 MB in the beginning and 219.2 MB in the end (delta: 67.1 MB). Free memory was 104.0 MB in the beginning and 124.8 MB in the end (delta: -20.9 MB). Peak memory consumption was 47.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int x = 0; VAL [x=0] [L14] unsigned int y = 1; VAL [x=0, y=1] [L16] COND TRUE x < 6 VAL [x=0, y=1] [L17] x++ VAL [x=1, y=1] [L18] y *= 2 VAL [x=1, y=2] [L16] COND TRUE x < 6 VAL [x=1, y=2] [L17] x++ VAL [x=2, y=2] [L18] y *= 2 VAL [x=2, y=4] [L16] COND TRUE x < 6 VAL [x=2, y=4] [L17] x++ VAL [x=3, y=4] [L18] y *= 2 VAL [x=3, y=8] [L16] COND TRUE x < 6 VAL [x=3, y=8] [L17] x++ VAL [x=4, y=8] [L18] y *= 2 VAL [x=4, y=16] [L16] COND TRUE x < 6 VAL [x=4, y=16] [L17] x++ VAL [x=5, y=16] [L18] y *= 2 VAL [x=5, y=32] [L16] COND TRUE x < 6 VAL [x=5, y=32] [L17] x++ VAL [x=6, y=32] [L18] y *= 2 VAL [x=6, y=64] [L16] COND FALSE !(x < 6) VAL [x=6, y=64] [L21] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L6] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L7] CALL reach_error() [L3] __assert_fail("0", "underapprox_2-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 4.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 649 SDs, 0 SdLazy, 980 SolverSat, 64 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 130 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 3.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 245 NumberOfCodeBlocks, 245 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 31431 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...