/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 14:53:58,188 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 14:53:58,190 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 14:53:58,202 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 14:53:58,202 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 14:53:58,203 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 14:53:58,205 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 14:53:58,206 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 14:53:58,208 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 14:53:58,209 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 14:53:58,210 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 14:53:58,211 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 14:53:58,211 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 14:53:58,212 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 14:53:58,213 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 14:53:58,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 14:53:58,215 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 14:53:58,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 14:53:58,217 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 14:53:58,219 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 14:53:58,220 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 14:53:58,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 14:53:58,222 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 14:53:58,223 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 14:53:58,225 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 14:53:58,232 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 14:53:58,233 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 14:53:58,234 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 14:53:58,235 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 14:53:58,243 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 14:53:58,243 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 14:53:58,244 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 14:53:58,245 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 14:53:58,245 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 14:53:58,245 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 14:53:58,245 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 14:53:58,245 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 14:53:58,246 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 14:53:58,246 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 14:53:58,246 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 14:53:58,246 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 14:53:58,246 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 14:53:58,247 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 14:53:58,247 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 14:53:58,247 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 14:53:58,247 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 14:53:58,247 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 14:53:58,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 14:53:58,248 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 14:53:58,248 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 14:53:58,248 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 14:53:58,249 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-17 14:53:58,546 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 14:53:58,559 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 14:53:58,563 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 14:53:58,564 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 14:53:58,565 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 14:53:58,565 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2020-07-17 14:53:58,637 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0b9f8c7b/98c0f576258c4246bea23cf1d98130a3/FLAG94d72f1cb [2020-07-17 14:53:59,071 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 14:53:59,072 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2020-07-17 14:53:59,078 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0b9f8c7b/98c0f576258c4246bea23cf1d98130a3/FLAG94d72f1cb [2020-07-17 14:53:59,446 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d0b9f8c7b/98c0f576258c4246bea23cf1d98130a3 [2020-07-17 14:53:59,457 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 14:53:59,460 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 14:53:59,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 14:53:59,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 14:53:59,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 14:53:59,466 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,469 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1baf0cb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59, skipping insertion in model container [2020-07-17 14:53:59,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,476 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 14:53:59,489 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 14:53:59,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 14:53:59,654 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 14:53:59,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 14:53:59,685 INFO L208 MainTranslator]: Completed translation [2020-07-17 14:53:59,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59 WrapperNode [2020-07-17 14:53:59,686 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 14:53:59,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 14:53:59,687 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 14:53:59,687 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 14:53:59,701 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,706 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,707 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,711 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,716 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,717 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (1/1) ... [2020-07-17 14:53:59,719 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 14:53:59,719 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 14:53:59,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 14:53:59,720 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 14:53:59,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (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 [2020-07-17 14:53:59,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 14:53:59,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 14:53:59,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 14:53:59,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 14:53:59,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 14:53:59,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 14:53:59,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-17 14:53:59,866 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 14:53:59,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 14:53:59,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 14:54:00,053 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 14:54:00,054 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-17 14:54:00,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 02:54:00 BoogieIcfgContainer [2020-07-17 14:54:00,058 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 14:54:00,059 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 14:54:00,059 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 14:54:00,063 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 14:54:00,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 02:53:59" (1/3) ... [2020-07-17 14:54:00,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae1d54d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 02:54:00, skipping insertion in model container [2020-07-17 14:54:00,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:53:59" (2/3) ... [2020-07-17 14:54:00,065 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae1d54d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 02:54:00, skipping insertion in model container [2020-07-17 14:54:00,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 02:54:00" (3/3) ... [2020-07-17 14:54:00,067 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2020-07-17 14:54:00,078 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 14:54:00,086 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 14:54:00,100 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 14:54:00,121 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 14:54:00,122 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 14:54:00,122 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-17 14:54:00,122 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 14:54:00,122 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 14:54:00,122 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 14:54:00,123 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 14:54:00,123 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 14:54:00,138 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-17 14:54:00,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-17 14:54:00,148 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:00,149 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:54:00,150 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:00,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:00,155 INFO L82 PathProgramCache]: Analyzing trace with hash -290415040, now seen corresponding path program 1 times [2020-07-17 14:54:00,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:00,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001356472] [2020-07-17 14:54:00,165 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:00,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:00,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:00,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:00,296 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:00,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001356472] [2020-07-17 14:54:00,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:00,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-17 14:54:00,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853432971] [2020-07-17 14:54:00,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-17 14:54:00,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:00,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-17 14:54:00,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 14:54:00,318 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-17 14:54:00,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:00,340 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-07-17 14:54:00,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-17 14:54:00,342 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2020-07-17 14:54:00,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:00,349 INFO L225 Difference]: With dead ends: 38 [2020-07-17 14:54:00,349 INFO L226 Difference]: Without dead ends: 21 [2020-07-17 14:54:00,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 14:54:00,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-17 14:54:00,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-17 14:54:00,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-17 14:54:00,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-17 14:54:00,388 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 14 [2020-07-17 14:54:00,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:00,389 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-17 14:54:00,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-17 14:54:00,389 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-17 14:54:00,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-17 14:54:00,390 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:00,390 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:54:00,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 14:54:00,391 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:00,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:00,391 INFO L82 PathProgramCache]: Analyzing trace with hash -304267855, now seen corresponding path program 1 times [2020-07-17 14:54:00,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:00,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354359271] [2020-07-17 14:54:00,392 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:00,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:00,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:00,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:00,491 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:00,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354359271] [2020-07-17 14:54:00,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:00,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 14:54:00,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304694229] [2020-07-17 14:54:00,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 14:54:00,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:00,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 14:54:00,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-17 14:54:00,496 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-07-17 14:54:00,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:00,551 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-17 14:54:00,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-17 14:54:00,552 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-17 14:54:00,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:00,554 INFO L225 Difference]: With dead ends: 28 [2020-07-17 14:54:00,554 INFO L226 Difference]: Without dead ends: 23 [2020-07-17 14:54:00,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-17 14:54:00,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-17 14:54:00,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-17 14:54:00,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-17 14:54:00,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-07-17 14:54:00,566 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 14 [2020-07-17 14:54:00,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:00,567 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-07-17 14:54:00,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 14:54:00,568 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-07-17 14:54:00,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-17 14:54:00,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:00,569 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] [2020-07-17 14:54:00,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 14:54:00,570 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:00,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:00,570 INFO L82 PathProgramCache]: Analyzing trace with hash -887516915, now seen corresponding path program 1 times [2020-07-17 14:54:00,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:00,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70282656] [2020-07-17 14:54:00,571 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:00,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:01,020 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:01,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70282656] [2020-07-17 14:54:01,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:01,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-07-17 14:54:01,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609892714] [2020-07-17 14:54:01,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-17 14:54:01,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:01,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-17 14:54:01,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-07-17 14:54:01,023 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 11 states. [2020-07-17 14:54:01,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:01,354 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-07-17 14:54:01,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-17 14:54:01,354 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2020-07-17 14:54:01,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:01,355 INFO L225 Difference]: With dead ends: 35 [2020-07-17 14:54:01,355 INFO L226 Difference]: Without dead ends: 30 [2020-07-17 14:54:01,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2020-07-17 14:54:01,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-17 14:54:01,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-07-17 14:54:01,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-17 14:54:01,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-17 14:54:01,365 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2020-07-17 14:54:01,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:01,366 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-17 14:54:01,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-17 14:54:01,366 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-17 14:54:01,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-17 14:54:01,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:01,369 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] [2020-07-17 14:54:01,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 14:54:01,370 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:01,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:01,370 INFO L82 PathProgramCache]: Analyzing trace with hash -507920327, now seen corresponding path program 1 times [2020-07-17 14:54:01,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:01,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624462800] [2020-07-17 14:54:01,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:01,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:01,481 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:01,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624462800] [2020-07-17 14:54:01,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:01,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-17 14:54:01,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315885892] [2020-07-17 14:54:01,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-17 14:54:01,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:01,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-17 14:54:01,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-17 14:54:01,484 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 4 states. [2020-07-17 14:54:01,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:01,509 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-07-17 14:54:01,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-17 14:54:01,510 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-07-17 14:54:01,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:01,511 INFO L225 Difference]: With dead ends: 40 [2020-07-17 14:54:01,511 INFO L226 Difference]: Without dead ends: 28 [2020-07-17 14:54:01,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-17 14:54:01,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-17 14:54:01,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-17 14:54:01,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-17 14:54:01,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-17 14:54:01,519 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 21 [2020-07-17 14:54:01,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:01,520 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-17 14:54:01,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-17 14:54:01,520 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-17 14:54:01,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-17 14:54:01,521 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:01,521 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:54:01,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 14:54:01,522 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:01,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:01,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1934159721, now seen corresponding path program 2 times [2020-07-17 14:54:01,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:01,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573640136] [2020-07-17 14:54:01,523 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:01,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:01,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:01,813 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:01,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573640136] [2020-07-17 14:54:01,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:01,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-07-17 14:54:01,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420745179] [2020-07-17 14:54:01,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-17 14:54:01,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:01,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-17 14:54:01,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-07-17 14:54:01,815 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 13 states. [2020-07-17 14:54:02,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:02,149 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-07-17 14:54:02,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-17 14:54:02,150 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2020-07-17 14:54:02,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:02,151 INFO L225 Difference]: With dead ends: 40 [2020-07-17 14:54:02,151 INFO L226 Difference]: Without dead ends: 35 [2020-07-17 14:54:02,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2020-07-17 14:54:02,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-17 14:54:02,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-17 14:54:02,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-17 14:54:02,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-17 14:54:02,161 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 26 [2020-07-17 14:54:02,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:02,162 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-17 14:54:02,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-17 14:54:02,162 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-17 14:54:02,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-17 14:54:02,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:02,164 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] [2020-07-17 14:54:02,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-17 14:54:02,165 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:02,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:02,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1064709469, now seen corresponding path program 1 times [2020-07-17 14:54:02,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:02,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328465007] [2020-07-17 14:54:02,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:02,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:02,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:02,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:02,218 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:02,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328465007] [2020-07-17 14:54:02,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:02,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 14:54:02,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848227017] [2020-07-17 14:54:02,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 14:54:02,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:02,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 14:54:02,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-17 14:54:02,222 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 5 states. [2020-07-17 14:54:02,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:02,278 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2020-07-17 14:54:02,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-17 14:54:02,279 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-17 14:54:02,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:02,280 INFO L225 Difference]: With dead ends: 50 [2020-07-17 14:54:02,280 INFO L226 Difference]: Without dead ends: 38 [2020-07-17 14:54:02,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-17 14:54:02,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-17 14:54:02,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-07-17 14:54:02,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-17 14:54:02,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-17 14:54:02,290 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2020-07-17 14:54:02,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:02,290 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-17 14:54:02,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 14:54:02,291 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-17 14:54:02,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-17 14:54:02,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:02,292 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:54:02,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-17 14:54:02,293 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:02,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:02,293 INFO L82 PathProgramCache]: Analyzing trace with hash -674418815, now seen corresponding path program 2 times [2020-07-17 14:54:02,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:02,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542574380] [2020-07-17 14:54:02,294 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:02,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:02,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:54:02,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:54:02,360 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:02,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542574380] [2020-07-17 14:54:02,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:54:02,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-17 14:54:02,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399552740] [2020-07-17 14:54:02,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 14:54:02,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:54:02,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 14:54:02,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-07-17 14:54:02,364 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 7 states. [2020-07-17 14:54:02,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:54:02,454 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2020-07-17 14:54:02,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-17 14:54:02,455 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-07-17 14:54:02,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:54:02,456 INFO L225 Difference]: With dead ends: 56 [2020-07-17 14:54:02,456 INFO L226 Difference]: Without dead ends: 44 [2020-07-17 14:54:02,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2020-07-17 14:54:02,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-17 14:54:02,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-17 14:54:02,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-17 14:54:02,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-07-17 14:54:02,466 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2020-07-17 14:54:02,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:54:02,466 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-07-17 14:54:02,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 14:54:02,467 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-07-17 14:54:02,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-17 14:54:02,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:54:02,468 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:54:02,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-07-17 14:54:02,468 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:54:02,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:54:02,469 INFO L82 PathProgramCache]: Analyzing trace with hash -809826651, now seen corresponding path program 3 times [2020-07-17 14:54:02,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:54:02,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836377079] [2020-07-17 14:54:02,470 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:54:02,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 14:54:02,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 14:54:02,539 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:54:02,539 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-17 14:54:02,540 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 14:54:02,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-07-17 14:54:02,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 02:54:02 BoogieIcfgContainer [2020-07-17 14:54:02,559 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 14:54:02,562 INFO L168 Benchmark]: Toolchain (without parser) took 3102.66 ms. Allocated memory was 143.7 MB in the beginning and 249.6 MB in the end (delta: 105.9 MB). Free memory was 102.4 MB in the beginning and 205.9 MB in the end (delta: -103.5 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,563 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,563 INFO L168 Benchmark]: CACSL2BoogieTranslator took 225.03 ms. Allocated memory is still 143.7 MB. Free memory was 101.9 MB in the beginning and 92.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,564 INFO L168 Benchmark]: Boogie Preprocessor took 32.60 ms. Allocated memory is still 143.7 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,565 INFO L168 Benchmark]: RCFGBuilder took 338.78 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 91.0 MB in the beginning and 168.8 MB in the end (delta: -77.7 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,566 INFO L168 Benchmark]: TraceAbstraction took 2500.04 ms. Allocated memory was 201.3 MB in the beginning and 249.6 MB in the end (delta: 48.2 MB). Free memory was 168.8 MB in the beginning and 205.9 MB in the end (delta: -37.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-07-17 14:54:02,570 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 225.03 ms. Allocated memory is still 143.7 MB. Free memory was 101.9 MB in the beginning and 92.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.60 ms. Allocated memory is still 143.7 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 338.78 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 91.0 MB in the beginning and 168.8 MB in the end (delta: -77.7 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2500.04 ms. Allocated memory was 201.3 MB in the beginning and 249.6 MB in the end (delta: 48.2 MB). Free memory was 168.8 MB in the beginning and 205.9 MB in the end (delta: -37.1 MB). Peak memory consumption was 11.1 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, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND TRUE i==4 [L15] sn=-10 [L13] i++ [L13] COND FALSE !(i<=n) [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.4s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 36 SDslu, 379 SDs, 0 SdLazy, 311 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 120 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 12 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...