/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 23:01:27,065 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 23:01:27,068 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 23:01:27,091 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 23:01:27,100 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 23:01:27,101 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 23:01:27,102 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 23:01:27,103 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 23:01:27,104 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 23:01:27,105 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 23:01:27,106 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 23:01:27,108 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 23:01:27,110 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 23:01:27,111 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 23:01:27,112 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 23:01:27,112 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 23:01:27,115 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 23:01:27,122 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 23:01:27,123 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 23:01:27,124 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 23:01:27,124 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 23:01:27,134 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 23:01:27,134 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 23:01:27,135 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 23:01:27,135 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 23:01:27,136 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 23:01:27,136 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 23:01:27,136 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 23:01:27,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 23:01:27,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 23:01:27,137 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 23:01:27,137 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 23:01:27,137 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 23:01:27,137 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 23:01:27,137 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 23:01:27,138 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 23:01:27,138 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 23:01:27,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 23:01:27,138 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 23:01:27,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:27,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 23:01:27,139 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 23:01:27,139 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 23:01:27,139 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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 [2020-08-22 23:01:27,413 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 23:01:27,425 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 23:01:27,429 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 23:01:27,430 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 23:01:27,431 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 23:01:27,431 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-08-22 23:01:27,512 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a049ba1a/e84e72aea7554b3ea992ad21c6ee5cce/FLAG576170696 [2020-08-22 23:01:27,994 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 23:01:27,995 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2020-08-22 23:01:28,002 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a049ba1a/e84e72aea7554b3ea992ad21c6ee5cce/FLAG576170696 [2020-08-22 23:01:28,386 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a049ba1a/e84e72aea7554b3ea992ad21c6ee5cce [2020-08-22 23:01:28,394 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 23:01:28,396 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 23:01:28,397 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:28,397 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 23:01:28,402 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 23:01:28,403 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,406 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29daa691 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28, skipping insertion in model container [2020-08-22 23:01:28,406 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,415 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 23:01:28,433 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 23:01:28,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:28,643 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 23:01:28,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:28,671 INFO L208 MainTranslator]: Completed translation [2020-08-22 23:01:28,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28 WrapperNode [2020-08-22 23:01:28,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:28,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 23:01:28,673 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 23:01:28,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 23:01:28,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,768 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,769 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,773 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,778 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,779 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (1/1) ... [2020-08-22 23:01:28,780 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 23:01:28,781 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 23:01:28,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 23:01:28,781 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 23:01:28,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (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 [2020-08-22 23:01:28,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 23:01:28,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 23:01:28,843 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 23:01:28,843 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 23:01:28,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 23:01:28,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 23:01:28,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 23:01:28,844 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 23:01:28,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 23:01:28,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 23:01:29,037 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 23:01:29,037 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 23:01:29,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:29 BoogieIcfgContainer [2020-08-22 23:01:29,041 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 23:01:29,043 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 23:01:29,043 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 23:01:29,046 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 23:01:29,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 11:01:28" (1/3) ... [2020-08-22 23:01:29,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62f71cd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:29, skipping insertion in model container [2020-08-22 23:01:29,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:28" (2/3) ... [2020-08-22 23:01:29,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62f71cd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:29, skipping insertion in model container [2020-08-22 23:01:29,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:29" (3/3) ... [2020-08-22 23:01:29,050 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-08-22 23:01:29,061 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 23:01:29,070 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 23:01:29,086 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 23:01:29,111 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 23:01:29,111 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 23:01:29,111 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 23:01:29,112 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 23:01:29,112 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 23:01:29,112 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 23:01:29,112 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 23:01:29,112 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 23:01:29,136 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-08-22 23:01:29,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 23:01:29,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:29,166 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:29,167 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:29,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:29,183 INFO L82 PathProgramCache]: Analyzing trace with hash 79158399, now seen corresponding path program 1 times [2020-08-22 23:01:29,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:29,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214724231] [2020-08-22 23:01:29,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:29,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:29,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:29,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214724231] [2020-08-22 23:01:29,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:29,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 23:01:29,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163196427] [2020-08-22 23:01:29,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 23:01:29,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:29,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 23:01:29,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 23:01:29,361 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 2 states. [2020-08-22 23:01:29,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:29,388 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2020-08-22 23:01:29,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 23:01:29,389 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-08-22 23:01:29,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:29,398 INFO L225 Difference]: With dead ends: 41 [2020-08-22 23:01:29,398 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 23:01:29,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 23:01:29,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 23:01:29,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 23:01:29,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 23:01:29,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-22 23:01:29,444 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2020-08-22 23:01:29,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:29,445 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-22 23:01:29,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 23:01:29,445 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-22 23:01:29,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 23:01:29,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:29,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:29,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 23:01:29,447 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:29,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:29,448 INFO L82 PathProgramCache]: Analyzing trace with hash 62535021, now seen corresponding path program 1 times [2020-08-22 23:01:29,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:29,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668624495] [2020-08-22 23:01:29,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:29,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:29,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:29,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668624495] [2020-08-22 23:01:29,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:29,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 23:01:29,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783521034] [2020-08-22 23:01:29,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 23:01:29,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:29,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 23:01:29,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 23:01:29,592 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 5 states. [2020-08-22 23:01:29,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:29,645 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-22 23:01:29,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 23:01:29,646 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-22 23:01:29,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:29,647 INFO L225 Difference]: With dead ends: 38 [2020-08-22 23:01:29,648 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 23:01:29,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:29,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 23:01:29,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-08-22 23:01:29,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 23:01:29,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-22 23:01:29,659 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 15 [2020-08-22 23:01:29,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:29,660 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-22 23:01:29,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 23:01:29,660 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-22 23:01:29,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 23:01:29,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:29,662 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] [2020-08-22 23:01:29,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 23:01:29,662 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:29,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:29,663 INFO L82 PathProgramCache]: Analyzing trace with hash 268436001, now seen corresponding path program 1 times [2020-08-22 23:01:29,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:29,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197498165] [2020-08-22 23:01:29,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:29,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:29,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:30,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197498165] [2020-08-22 23:01:30,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:30,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 23:01:30,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819956071] [2020-08-22 23:01:30,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 23:01:30,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 23:01:30,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-08-22 23:01:30,012 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 11 states. [2020-08-22 23:01:30,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:30,297 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2020-08-22 23:01:30,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 23:01:30,298 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2020-08-22 23:01:30,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:30,301 INFO L225 Difference]: With dead ends: 60 [2020-08-22 23:01:30,302 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 23:01:30,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:30,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 23:01:30,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 42. [2020-08-22 23:01:30,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 23:01:30,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-08-22 23:01:30,316 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 24 [2020-08-22 23:01:30,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:30,317 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-08-22 23:01:30,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 23:01:30,317 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-08-22 23:01:30,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 23:01:30,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:30,319 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:30,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 23:01:30,319 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:30,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:30,320 INFO L82 PathProgramCache]: Analyzing trace with hash -635017609, now seen corresponding path program 1 times [2020-08-22 23:01:30,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:30,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978333740] [2020-08-22 23:01:30,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:30,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:30,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,429 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:30,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978333740] [2020-08-22 23:01:30,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:30,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 23:01:30,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145128501] [2020-08-22 23:01:30,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:30,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:30,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:30,434 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 8 states. [2020-08-22 23:01:30,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:30,620 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2020-08-22 23:01:30,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 23:01:30,621 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-08-22 23:01:30,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:30,622 INFO L225 Difference]: With dead ends: 60 [2020-08-22 23:01:30,623 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 23:01:30,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2020-08-22 23:01:30,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 23:01:30,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-08-22 23:01:30,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 23:01:30,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-22 23:01:30,643 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-22 23:01:30,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:30,643 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-22 23:01:30,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:30,644 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-22 23:01:30,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 23:01:30,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:30,647 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:30,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 23:01:30,647 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:30,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:30,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1260601325, now seen corresponding path program 2 times [2020-08-22 23:01:30,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:30,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996338707] [2020-08-22 23:01:30,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:30,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:30,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,995 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 23:01:30,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996338707] [2020-08-22 23:01:30,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:30,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 23:01:30,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930267385] [2020-08-22 23:01:30,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 23:01:30,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 23:01:30,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-22 23:01:30,998 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 13 states. [2020-08-22 23:01:31,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:31,318 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-22 23:01:31,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:31,319 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-22 23:01:31,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:31,321 INFO L225 Difference]: With dead ends: 54 [2020-08-22 23:01:31,321 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 23:01:31,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2020-08-22 23:01:31,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 23:01:31,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-08-22 23:01:31,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 23:01:31,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-22 23:01:31,333 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 33 [2020-08-22 23:01:31,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:31,334 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-22 23:01:31,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 23:01:31,334 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-22 23:01:31,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 23:01:31,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:31,336 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:31,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 23:01:31,336 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:31,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:31,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1220208573, now seen corresponding path program 2 times [2020-08-22 23:01:31,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:31,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682940423] [2020-08-22 23:01:31,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:31,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:31,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:31,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682940423] [2020-08-22 23:01:31,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:31,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:31,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518278172] [2020-08-22 23:01:31,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:31,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:31,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:31,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:31,479 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2020-08-22 23:01:31,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:31,660 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2020-08-22 23:01:31,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:31,660 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-08-22 23:01:31,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:31,661 INFO L225 Difference]: With dead ends: 70 [2020-08-22 23:01:31,662 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 23:01:31,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2020-08-22 23:01:31,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 23:01:31,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2020-08-22 23:01:31,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 23:01:31,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-08-22 23:01:31,673 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 41 [2020-08-22 23:01:31,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:31,674 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-08-22 23:01:31,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:31,674 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-08-22 23:01:31,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 23:01:31,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:31,676 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:31,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 23:01:31,676 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:31,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:31,677 INFO L82 PathProgramCache]: Analyzing trace with hash 765701111, now seen corresponding path program 3 times [2020-08-22 23:01:31,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:31,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64913937] [2020-08-22 23:01:31,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:31,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,841 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:31,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64913937] [2020-08-22 23:01:31,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:31,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 23:01:31,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241789905] [2020-08-22 23:01:31,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 23:01:31,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:31,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 23:01:31,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:31,844 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 16 states. [2020-08-22 23:01:32,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:32,131 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2020-08-22 23:01:32,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 23:01:32,132 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2020-08-22 23:01:32,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:32,133 INFO L225 Difference]: With dead ends: 79 [2020-08-22 23:01:32,134 INFO L226 Difference]: Without dead ends: 65 [2020-08-22 23:01:32,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:01:32,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-22 23:01:32,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-22 23:01:32,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-22 23:01:32,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-22 23:01:32,155 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 50 [2020-08-22 23:01:32,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:32,155 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-22 23:01:32,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 23:01:32,155 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-22 23:01:32,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 23:01:32,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:32,162 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:32,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 23:01:32,162 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:32,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:32,166 INFO L82 PathProgramCache]: Analyzing trace with hash -258080061, now seen corresponding path program 4 times [2020-08-22 23:01:32,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:32,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541407073] [2020-08-22 23:01:32,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:32,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:32,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,454 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 29 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:32,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541407073] [2020-08-22 23:01:32,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:32,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 23:01:32,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003953684] [2020-08-22 23:01:32,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 23:01:32,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:32,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 23:01:32,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2020-08-22 23:01:32,457 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 20 states. [2020-08-22 23:01:32,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:32,842 INFO L93 Difference]: Finished difference Result 87 states and 91 transitions. [2020-08-22 23:01:32,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 23:01:32,842 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 59 [2020-08-22 23:01:32,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:32,844 INFO L225 Difference]: With dead ends: 87 [2020-08-22 23:01:32,844 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 23:01:32,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=307, Invalid=1025, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 23:01:32,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 23:01:32,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2020-08-22 23:01:32,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-22 23:01:32,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2020-08-22 23:01:32,858 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 59 [2020-08-22 23:01:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:32,859 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2020-08-22 23:01:32,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 23:01:32,859 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2020-08-22 23:01:32,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-22 23:01:32,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:32,860 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:32,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 23:01:32,861 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:32,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:32,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1030394231, now seen corresponding path program 5 times [2020-08-22 23:01:32,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:32,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934184629] [2020-08-22 23:01:32,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:32,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:32,883 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:32,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:32,900 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:32,924 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 23:01:32,925 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 23:01:32,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 23:01:32,961 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 11:01:32 BoogieIcfgContainer [2020-08-22 23:01:32,961 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 23:01:32,964 INFO L168 Benchmark]: Toolchain (without parser) took 4567.85 ms. Allocated memory was 138.4 MB in the beginning and 249.6 MB in the end (delta: 111.1 MB). Free memory was 102.3 MB in the beginning and 122.4 MB in the end (delta: -20.1 MB). Peak memory consumption was 91.1 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,965 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.4 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,966 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.47 ms. Allocated memory is still 138.4 MB. Free memory was 102.1 MB in the beginning and 92.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,967 INFO L168 Benchmark]: Boogie Preprocessor took 107.47 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 92.7 MB in the beginning and 179.7 MB in the end (delta: -87.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,968 INFO L168 Benchmark]: RCFGBuilder took 260.89 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 166.9 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,969 INFO L168 Benchmark]: TraceAbstraction took 3918.73 ms. Allocated memory was 201.3 MB in the beginning and 249.6 MB in the end (delta: 48.2 MB). Free memory was 166.2 MB in the beginning and 122.4 MB in the end (delta: 43.8 MB). Peak memory consumption was 92.0 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:32,972 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.4 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 275.47 ms. Allocated memory is still 138.4 MB. Free memory was 102.1 MB in the beginning and 92.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.47 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 92.7 MB in the beginning and 179.7 MB in the end (delta: -87.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 260.89 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 166.9 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3918.73 ms. Allocated memory was 201.3 MB in the beginning and 249.6 MB in the end (delta: 48.2 MB). Free memory was 166.2 MB in the beginning and 122.4 MB in the end (delta: 43.8 MB). Peak memory consumption was 92.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; VAL [__VERIFIER_nondet_uint()=6, j=10, n=6] [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; VAL [j=10, n=0, n=6] [L13] i=1 VAL [i=1, j=10, n=6, n=0] [L13] COND TRUE i<=n VAL [i=1, j=10, n=6, n=0] [L14] COND TRUE i