/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_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:10:42,174 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:10:42,178 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:10:42,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:10:42,218 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:10:42,223 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:10:42,224 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:10:42,229 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:10:42,231 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:10:42,232 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:10:42,233 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:10:42,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:10:42,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:10:42,236 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:10:42,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:10:42,238 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:10:42,238 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:10:42,239 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:10:42,241 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:10:42,242 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:10:42,244 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:10:42,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:10:42,246 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:10:42,247 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:10:42,250 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 23:10:42,257 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:10:42,258 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:10:42,259 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:10:42,260 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 23:10:42,270 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:10:42,270 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:10:42,272 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:10:42,272 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:10:42,272 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:10:42,272 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:10:42,273 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:10:42,273 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:10:42,273 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:10:42,273 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:10:42,273 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:10:42,274 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:10:42,274 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:10:42,274 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:10:42,274 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:10:42,274 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:10:42,275 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:10:42,275 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:10:42,275 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:10:42,275 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:10:42,275 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:10:42,276 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:10:42,276 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 [2020-09-04 23:10:42,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:10:42,763 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:10:42,769 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:10:42,770 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:10:42,771 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:10:42,772 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2020-09-04 23:10:42,860 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a34045447/3f124cad29704689b4de9c05800ab320/FLAG3723a9889 [2020-09-04 23:10:43,370 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:10:43,371 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2020-09-04 23:10:43,379 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a34045447/3f124cad29704689b4de9c05800ab320/FLAG3723a9889 [2020-09-04 23:10:43,728 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a34045447/3f124cad29704689b4de9c05800ab320 [2020-09-04 23:10:43,741 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:10:43,743 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:10:43,745 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:10:43,745 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:10:43,749 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:10:43,750 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:10:43" (1/1) ... [2020-09-04 23:10:43,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44dc5d33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:43, skipping insertion in model container [2020-09-04 23:10:43,755 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:10:43" (1/1) ... [2020-09-04 23:10:43,763 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:10:43,787 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:10:43,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:10:43,993 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:10:44,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:10:44,030 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:10:44,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44 WrapperNode [2020-09-04 23:10:44,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:10:44,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:10:44,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:10:44,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:10:44,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,052 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,052 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,056 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,062 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,063 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... [2020-09-04 23:10:44,141 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:10:44,142 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:10:44,142 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:10:44,142 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:10:44,143 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 23:10:44,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:10:44,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:10:44,216 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:10:44,216 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:10:44,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:10:44,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:10:44,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 23:10:44,217 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:10:44,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:10:44,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:10:44,415 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:10:44,415 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 23:10:44,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:10:44 BoogieIcfgContainer [2020-09-04 23:10:44,421 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:10:44,422 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:10:44,422 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:10:44,426 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:10:44,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:10:43" (1/3) ... [2020-09-04 23:10:44,427 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1771ec44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:10:44, skipping insertion in model container [2020-09-04 23:10:44,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:44" (2/3) ... [2020-09-04 23:10:44,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1771ec44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:10:44, skipping insertion in model container [2020-09-04 23:10:44,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:10:44" (3/3) ... [2020-09-04 23:10:44,430 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2020-09-04 23:10:44,445 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:10:44,455 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:10:44,481 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:10:44,514 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:10:44,514 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:10:44,514 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:10:44,515 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:10:44,515 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:10:44,515 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:10:44,515 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:10:44,515 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:10:44,538 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-09-04 23:10:44,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-04 23:10:44,551 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:44,552 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:44,553 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:44,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:44,562 INFO L82 PathProgramCache]: Analyzing trace with hash -290415040, now seen corresponding path program 1 times [2020-09-04 23:10:44,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:44,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304600570] [2020-09-04 23:10:44,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:44,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:44,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304600570] [2020-09-04 23:10:44,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:44,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 23:10:44,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441490180] [2020-09-04 23:10:44,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 23:10:44,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:44,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 23:10:44,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 23:10:44,756 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-09-04 23:10:44,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:44,787 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-09-04 23:10:44,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 23:10:44,789 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2020-09-04 23:10:44,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:44,799 INFO L225 Difference]: With dead ends: 38 [2020-09-04 23:10:44,799 INFO L226 Difference]: Without dead ends: 21 [2020-09-04 23:10:44,803 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 [2020-09-04 23:10:44,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-04 23:10:44,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-04 23:10:44,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-04 23:10:44,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-04 23:10:44,844 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 14 [2020-09-04 23:10:44,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:44,844 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-04 23:10:44,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 23:10:44,845 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-04 23:10:44,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-04 23:10:44,846 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:44,846 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:44,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:10:44,846 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:44,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:44,847 INFO L82 PathProgramCache]: Analyzing trace with hash -304267855, now seen corresponding path program 1 times [2020-09-04 23:10:44,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:44,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162198010] [2020-09-04 23:10:44,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:44,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:44,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:44,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162198010] [2020-09-04 23:10:44,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:44,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 23:10:44,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869714929] [2020-09-04 23:10:44,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 23:10:44,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:44,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 23:10:44,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 23:10:44,965 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-09-04 23:10:45,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:45,020 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-09-04 23:10:45,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 23:10:45,020 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-09-04 23:10:45,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:45,022 INFO L225 Difference]: With dead ends: 28 [2020-09-04 23:10:45,022 INFO L226 Difference]: Without dead ends: 23 [2020-09-04 23:10:45,023 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 [2020-09-04 23:10:45,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-04 23:10:45,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-09-04 23:10:45,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-04 23:10:45,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-09-04 23:10:45,031 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 14 [2020-09-04 23:10:45,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:45,031 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-09-04 23:10:45,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 23:10:45,031 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-09-04 23:10:45,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-04 23:10:45,032 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:45,033 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] [2020-09-04 23:10:45,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:10:45,033 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:45,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:45,034 INFO L82 PathProgramCache]: Analyzing trace with hash -887516915, now seen corresponding path program 1 times [2020-09-04 23:10:45,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:45,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980399270] [2020-09-04 23:10:45,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:45,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:45,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:45,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980399270] [2020-09-04 23:10:45,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:45,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-04 23:10:45,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419429220] [2020-09-04 23:10:45,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 23:10:45,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:45,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 23:10:45,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:10:45,468 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 11 states. [2020-09-04 23:10:45,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:45,733 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-09-04 23:10:45,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:10:45,733 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2020-09-04 23:10:45,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:45,735 INFO L225 Difference]: With dead ends: 35 [2020-09-04 23:10:45,735 INFO L226 Difference]: Without dead ends: 30 [2020-09-04 23:10:45,736 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 [2020-09-04 23:10:45,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-04 23:10:45,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-09-04 23:10:45,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 23:10:45,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-09-04 23:10:45,745 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2020-09-04 23:10:45,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:45,746 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-09-04 23:10:45,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 23:10:45,746 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-09-04 23:10:45,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-04 23:10:45,747 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:45,747 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] [2020-09-04 23:10:45,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:10:45,748 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:45,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:45,748 INFO L82 PathProgramCache]: Analyzing trace with hash -507920327, now seen corresponding path program 1 times [2020-09-04 23:10:45,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:45,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227425055] [2020-09-04 23:10:45,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:45,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:45,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:45,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227425055] [2020-09-04 23:10:45,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:45,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 23:10:45,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161231564] [2020-09-04 23:10:45,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 23:10:45,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:45,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 23:10:45,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:10:45,796 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 3 states. [2020-09-04 23:10:45,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:45,832 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-09-04 23:10:45,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 23:10:45,833 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-09-04 23:10:45,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:45,834 INFO L225 Difference]: With dead ends: 40 [2020-09-04 23:10:45,834 INFO L226 Difference]: Without dead ends: 28 [2020-09-04 23:10:45,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:10:45,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-04 23:10:45,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-04 23:10:45,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 23:10:45,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-09-04 23:10:45,853 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 21 [2020-09-04 23:10:45,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:45,854 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-09-04 23:10:45,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 23:10:45,854 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-09-04 23:10:45,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 23:10:45,855 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:45,855 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] [2020-09-04 23:10:45,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:10:45,856 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:45,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:45,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1934159721, now seen corresponding path program 2 times [2020-09-04 23:10:45,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:45,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408608064] [2020-09-04 23:10:45,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:45,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:46,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,209 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 23:10:46,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408608064] [2020-09-04 23:10:46,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:46,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-04 23:10:46,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007302866] [2020-09-04 23:10:46,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 23:10:46,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:46,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 23:10:46,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:10:46,212 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 13 states. [2020-09-04 23:10:46,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,553 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-09-04 23:10:46,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 23:10:46,553 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2020-09-04 23:10:46,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,554 INFO L225 Difference]: With dead ends: 40 [2020-09-04 23:10:46,555 INFO L226 Difference]: Without dead ends: 35 [2020-09-04 23:10:46,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2020-09-04 23:10:46,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-04 23:10:46,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-09-04 23:10:46,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-04 23:10:46,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-09-04 23:10:46,563 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 26 [2020-09-04 23:10:46,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,564 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-09-04 23:10:46,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 23:10:46,564 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-09-04 23:10:46,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-04 23:10:46,565 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,565 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] [2020-09-04 23:10:46,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:10:46,566 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1064709469, now seen corresponding path program 1 times [2020-09-04 23:10:46,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678177453] [2020-09-04 23:10:46,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:46,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,608 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:46,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678177453] [2020-09-04 23:10:46,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:46,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-04 23:10:46,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721719699] [2020-09-04 23:10:46,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 23:10:46,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:46,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 23:10:46,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-04 23:10:46,611 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 5 states. [2020-09-04 23:10:46,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,663 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2020-09-04 23:10:46,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 23:10:46,664 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-09-04 23:10:46,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,665 INFO L225 Difference]: With dead ends: 50 [2020-09-04 23:10:46,666 INFO L226 Difference]: Without dead ends: 38 [2020-09-04 23:10:46,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:10:46,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-04 23:10:46,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-09-04 23:10:46,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-04 23:10:46,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-09-04 23:10:46,676 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2020-09-04 23:10:46,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,677 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-09-04 23:10:46,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 23:10:46,677 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-09-04 23:10:46,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 23:10:46,678 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,678 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] [2020-09-04 23:10:46,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:10:46,679 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,680 INFO L82 PathProgramCache]: Analyzing trace with hash -674418815, now seen corresponding path program 2 times [2020-09-04 23:10:46,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375782382] [2020-09-04 23:10:46,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:46,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,742 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:46,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375782382] [2020-09-04 23:10:46,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:46,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-04 23:10:46,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402213029] [2020-09-04 23:10:46,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 23:10:46,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:46,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 23:10:46,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:10:46,745 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 7 states. [2020-09-04 23:10:46,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,833 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2020-09-04 23:10:46,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:10:46,834 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-09-04 23:10:46,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,835 INFO L225 Difference]: With dead ends: 56 [2020-09-04 23:10:46,835 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 23:10:46,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:10:46,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 23:10:46,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 23:10:46,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 23:10:46,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-09-04 23:10:46,844 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2020-09-04 23:10:46,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,845 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-09-04 23:10:46,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 23:10:46,845 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-09-04 23:10:46,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-04 23:10:46,846 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,846 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] [2020-09-04 23:10:46,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:10:46,847 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,847 INFO L82 PathProgramCache]: Analyzing trace with hash -809826651, now seen corresponding path program 3 times [2020-09-04 23:10:46,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629920668] [2020-09-04 23:10:46,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:10:46,864 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:10:46,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:10:46,879 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:10:46,906 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 23:10:46,906 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 23:10:46,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:10:46,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 11:10:46 BoogieIcfgContainer [2020-09-04 23:10:46,939 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 23:10:46,943 INFO L168 Benchmark]: Toolchain (without parser) took 3198.15 ms. Allocated memory was 138.9 MB in the beginning and 246.4 MB in the end (delta: 107.5 MB). Free memory was 103.5 MB in the beginning and 213.2 MB in the end (delta: -109.7 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 23:10:46,943 INFO L168 Benchmark]: CDTParser took 0.99 ms. Allocated memory is still 138.9 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 23:10:46,944 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.59 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 93.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-09-04 23:10:46,945 INFO L168 Benchmark]: Boogie Preprocessor took 110.08 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 93.5 MB in the beginning and 181.9 MB in the end (delta: -88.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-09-04 23:10:46,946 INFO L168 Benchmark]: RCFGBuilder took 279.00 ms. Allocated memory is still 201.9 MB. Free memory was 181.9 MB in the beginning and 168.8 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-09-04 23:10:46,947 INFO L168 Benchmark]: TraceAbstraction took 2517.32 ms. Allocated memory was 201.9 MB in the beginning and 246.4 MB in the end (delta: 44.6 MB). Free memory was 168.8 MB in the beginning and 213.2 MB in the end (delta: -44.4 MB). Peak memory consumption was 149.9 kB. Max. memory is 7.1 GB. [2020-09-04 23:10:46,953 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.99 ms. Allocated memory is still 138.9 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 286.59 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 93.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.08 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 93.5 MB in the beginning and 181.9 MB in the end (delta: -88.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 279.00 ms. Allocated memory is still 201.9 MB. Free memory was 181.9 MB in the beginning and 168.8 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2517.32 ms. Allocated memory was 201.9 MB in the beginning and 246.4 MB in the end (delta: 44.6 MB). Free memory was 168.8 MB in the beginning and 213.2 MB in the end (delta: -44.4 MB). Peak memory consumption was 149.9 kB. 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; VAL [__VERIFIER_nondet_uint()=4, n=4] [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; VAL [n=0, n=4] [L13] i=1 VAL [i=1, n=4, n=0] [L13] COND TRUE i<=n VAL [i=1, n=4, n=0] [L14] sn = sn + (2) VAL [i=1, n=2, n=4] [L15] COND FALSE !(i==4) VAL [i=1, n=4, n=2] [L13] i++ VAL [i=2, n=2, n=4] [L13] COND TRUE i<=n VAL [i=2, n=2, n=4] [L14] sn = sn + (2) VAL [i=2, n=4, n=4] [L15] COND FALSE !(i==4) VAL [i=2, n=4, n=4] [L13] i++ VAL [i=3, n=4, n=4] [L13] COND TRUE i<=n VAL [i=3, n=4, n=4] [L14] sn = sn + (2) VAL [i=3, n=6, n=4] [L15] COND FALSE !(i==4) VAL [i=3, n=4, n=6] [L13] i++ VAL [i=4, n=4, n=6] [L13] COND TRUE i<=n VAL [i=4, n=4, n=6] [L14] sn = sn + (2) VAL [i=4, n=4, n=8] [L15] COND TRUE i==4 VAL [i=4, n=8, n=4] [L15] sn=-10 VAL [i=4, n=-10, n=4] [L13] i++ VAL [i=5, n=4, n=-10] [L13] COND FALSE !(i<=n) VAL [i=5, n=4, n=-10] [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 33 SDslu, 359 SDs, 0 SdLazy, 300 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 82 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 53 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: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 194 NumberOfCodeBlocks, 194 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 148 ConstructedInterpolants, 0 QuantifiedInterpolants, 13352 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 3 PerfectInterpolantSequences, 16/39 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...