/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.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:04:20,248 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 19:04:20,279 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:04:20,280 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:04:20,281 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:04:20,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:04:20,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:04:20,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:04:20,287 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:04:20,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:04:20,289 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:04:20,290 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:04:20,291 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:04:20,292 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:04:20,293 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:04:20,294 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:04:20,296 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:04:20,298 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:04:20,300 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:04:20,301 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:04:20,303 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:04:20,304 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:04:20,307 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:04:20,320 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:04:20,321 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:04:20,321 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:04:20,322 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:04:20,348 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:04:20,348 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:04:20,349 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:04:20,350 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:04:20,350 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:04:20,350 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:04:20,350 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:04:20,351 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:04:20,352 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:04:20,352 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:04:20,352 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:04:20,352 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:04:20,352 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:04:20,353 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:04:20,353 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:04:20,353 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:04:20,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:04:20,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:04:20,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:04:20,354 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:04:20,354 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:04:20,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:04:20,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:04:20,355 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:04:20,355 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES 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: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:04:20,670 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:04:20,682 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:04:20,686 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:04:20,687 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:04:20,688 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:04:20,689 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2020-08-21 19:04:20,745 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6c668eef7/8041970e55da4a209d0e2f77fee03c87/FLAG496b63176 [2020-08-21 19:04:21,181 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:04:21,182 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum04-1.i [2020-08-21 19:04:21,188 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6c668eef7/8041970e55da4a209d0e2f77fee03c87/FLAG496b63176 [2020-08-21 19:04:21,603 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6c668eef7/8041970e55da4a209d0e2f77fee03c87 [2020-08-21 19:04:21,612 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:04:21,614 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:04:21,615 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:21,615 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:04:21,619 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:04:21,620 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,623 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@661e677f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21, skipping insertion in model container [2020-08-21 19:04:21,623 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,631 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:04:21,650 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:04:21,843 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:21,847 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:04:21,869 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:21,881 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:04:21,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21 WrapperNode [2020-08-21 19:04:21,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:21,884 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:04:21,884 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:04:21,884 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:04:21,896 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,901 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,901 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,997 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,998 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (1/1) ... [2020-08-21 19:04:21,999 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:04:21,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:04:21,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:04:21,999 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:04:22,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (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 [2020-08-21 19:04:22,052 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:04:22,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:04:22,053 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:04:22,053 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:04:22,053 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:04:22,053 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:04:22,053 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:04:22,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:04:22,054 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:04:22,243 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:04:22,244 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:04:22,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:22 BoogieIcfgContainer [2020-08-21 19:04:22,248 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:04:22,249 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:04:22,249 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:04:22,252 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:04:22,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:04:21" (1/3) ... [2020-08-21 19:04:22,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a987c47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:22, skipping insertion in model container [2020-08-21 19:04:22,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:21" (2/3) ... [2020-08-21 19:04:22,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a987c47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:22, skipping insertion in model container [2020-08-21 19:04:22,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:22" (3/3) ... [2020-08-21 19:04:22,256 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2020-08-21 19:04:22,268 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:04:22,276 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:04:22,290 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:04:22,315 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:04:22,315 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:04:22,316 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:04:22,316 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:04:22,316 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:04:22,316 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:04:22,316 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:04:22,316 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:04:22,334 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 19:04:22,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:04:22,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,341 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:22,342 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,348 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-08-21 19:04:22,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189708582] [2020-08-21 19:04:22,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:22,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189708582] [2020-08-21 19:04:22,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:22,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 19:04:22,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533739289] [2020-08-21 19:04:22,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 19:04:22,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 19:04:22,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:04:22,487 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-08-21 19:04:22,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,514 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 19:04:22,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 19:04:22,516 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 19:04:22,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,525 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:04:22,525 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 19:04:22,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:04:22,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 19:04:22,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 19:04:22,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 19:04:22,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 19:04:22,570 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 19:04:22,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,571 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 19:04:22,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 19:04:22,571 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 19:04:22,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:04:22,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,572 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:22,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:04:22,573 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,574 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2020-08-21 19:04:22,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267285901] [2020-08-21 19:04:22,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,634 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:22,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267285901] [2020-08-21 19:04:22,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:22,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:04:22,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105004228] [2020-08-21 19:04:22,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:04:22,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:04:22,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:04:22,645 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2020-08-21 19:04:22,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,702 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2020-08-21 19:04:22,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:04:22,703 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 19:04:22,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,705 INFO L225 Difference]: With dead ends: 24 [2020-08-21 19:04:22,705 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:04:22,706 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 [2020-08-21 19:04:22,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:04:22,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 19:04:22,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:04:22,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 19:04:22,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2020-08-21 19:04:22,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,714 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 19:04:22,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:04:22,715 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 19:04:22,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:04:22,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,730 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:22,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:04:22,731 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-08-21 19:04:22,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047324164] [2020-08-21 19:04:22,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:22,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047324164] [2020-08-21 19:04:22,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 19:04:22,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146643962] [2020-08-21 19:04:22,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:04:22,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:04:22,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:22,847 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2020-08-21 19:04:22,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,886 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 19:04:22,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:04:22,887 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-08-21 19:04:22,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,888 INFO L225 Difference]: With dead ends: 27 [2020-08-21 19:04:22,888 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 19:04:22,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:22,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 19:04:22,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-08-21 19:04:22,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 19:04:22,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 19:04:22,894 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 19:04:22,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,895 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 19:04:22,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:04:22,895 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 19:04:22,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:04:22,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,898 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:22,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:04:22,898 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1717165257, now seen corresponding path program 2 times [2020-08-21 19:04:22,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510009411] [2020-08-21 19:04:22,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:22,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510009411] [2020-08-21 19:04:22,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:04:22,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108703859] [2020-08-21 19:04:22,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:22,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:22,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:22,966 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2020-08-21 19:04:23,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,017 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 19:04:23,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:23,017 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-21 19:04:23,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,018 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:04:23,019 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 19:04:23,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:23,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 19:04:23,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 19:04:23,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:04:23,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 19:04:23,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2020-08-21 19:04:23,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,028 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 19:04:23,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:23,028 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 19:04:23,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:04:23,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,029 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:04:23,030 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,030 INFO L82 PathProgramCache]: Analyzing trace with hash -424886253, now seen corresponding path program 3 times [2020-08-21 19:04:23,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067676210] [2020-08-21 19:04:23,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,079 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 19:04:23,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067676210] [2020-08-21 19:04:23,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:23,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:04:23,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310747316] [2020-08-21 19:04:23,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:04:23,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:04:23,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:23,082 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2020-08-21 19:04:23,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,112 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-08-21 19:04:23,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:04:23,112 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-08-21 19:04:23,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,113 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:04:23,114 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 19:04:23,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:23,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 19:04:23,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-08-21 19:04:23,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:04:23,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 19:04:23,121 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2020-08-21 19:04:23,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,121 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 19:04:23,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:04:23,122 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 19:04:23,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:04:23,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,123 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:04:23,123 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,124 INFO L82 PathProgramCache]: Analyzing trace with hash -452912071, now seen corresponding path program 1 times [2020-08-21 19:04:23,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366473696] [2020-08-21 19:04:23,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,195 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 19:04:23,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366473696] [2020-08-21 19:04:23,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:04:23,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087647743] [2020-08-21 19:04:23,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:23,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:23,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:23,198 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2020-08-21 19:04:23,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,236 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-08-21 19:04:23,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:23,236 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2020-08-21 19:04:23,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,239 INFO L225 Difference]: With dead ends: 33 [2020-08-21 19:04:23,240 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 19:04:23,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:23,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 19:04:23,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-21 19:04:23,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 19:04:23,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 19:04:23,248 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22 [2020-08-21 19:04:23,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,248 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 19:04:23,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:23,249 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 19:04:23,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 19:04:23,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,250 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:04:23,250 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,251 INFO L82 PathProgramCache]: Analyzing trace with hash -2146400685, now seen corresponding path program 2 times [2020-08-21 19:04:23,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441988251] [2020-08-21 19:04:23,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,365 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 19:04:23,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441988251] [2020-08-21 19:04:23,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:04:23,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606434152] [2020-08-21 19:04:23,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:04:23,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:04:23,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:23,371 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-08-21 19:04:23,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,453 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-21 19:04:23,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:04:23,454 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-08-21 19:04:23,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,455 INFO L225 Difference]: With dead ends: 36 [2020-08-21 19:04:23,455 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 19:04:23,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:23,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 19:04:23,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-08-21 19:04:23,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:04:23,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-08-21 19:04:23,463 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2020-08-21 19:04:23,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,463 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-08-21 19:04:23,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:04:23,463 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-08-21 19:04:23,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:04:23,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,465 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:04:23,465 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,466 INFO L82 PathProgramCache]: Analyzing trace with hash 115125753, now seen corresponding path program 3 times [2020-08-21 19:04:23,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573904336] [2020-08-21 19:04:23,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,539 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 29 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 19:04:23,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573904336] [2020-08-21 19:04:23,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:04:23,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156840467] [2020-08-21 19:04:23,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:04:23,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:04:23,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:23,542 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2020-08-21 19:04:23,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,604 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-08-21 19:04:23,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:23,605 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-08-21 19:04:23,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,606 INFO L225 Difference]: With dead ends: 39 [2020-08-21 19:04:23,606 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:04:23,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:23,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:04:23,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-21 19:04:23,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 19:04:23,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-08-21 19:04:23,613 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 28 [2020-08-21 19:04:23,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,614 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-08-21 19:04:23,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:04:23,614 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-08-21 19:04:23,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 19:04:23,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,615 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:04:23,615 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1902732141, now seen corresponding path program 4 times [2020-08-21 19:04:23,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790243526] [2020-08-21 19:04:23,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,692 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 37 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 19:04:23,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790243526] [2020-08-21 19:04:23,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:04:23,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683725089] [2020-08-21 19:04:23,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:23,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:23,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:23,695 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 8 states. [2020-08-21 19:04:23,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,742 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2020-08-21 19:04:23,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:04:23,743 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 19:04:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,744 INFO L225 Difference]: With dead ends: 40 [2020-08-21 19:04:23,744 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:04:23,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:23,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:04:23,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:04:23,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:04:23,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-08-21 19:04:23,751 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 31 [2020-08-21 19:04:23,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,751 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-08-21 19:04:23,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:23,752 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-08-21 19:04:23,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:04:23,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,753 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:23,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:04:23,753 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,754 INFO L82 PathProgramCache]: Analyzing trace with hash 749989817, now seen corresponding path program 5 times [2020-08-21 19:04:23,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932285017] [2020-08-21 19:04:23,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 19:04:23,769 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 19:04:23,770 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 19:04:23,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:04:23,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:04:23 BoogieIcfgContainer [2020-08-21 19:04:23,791 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:04:23,794 INFO L168 Benchmark]: Toolchain (without parser) took 2180.19 ms. Allocated memory was 136.8 MB in the beginning and 227.5 MB in the end (delta: 90.7 MB). Free memory was 99.7 MB in the beginning and 176.5 MB in the end (delta: -76.8 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,795 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 136.8 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,796 INFO L168 Benchmark]: CACSL2BoogieTranslator took 268.55 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 90.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,797 INFO L168 Benchmark]: Boogie Preprocessor took 115.46 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 90.2 MB in the beginning and 179.2 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,798 INFO L168 Benchmark]: RCFGBuilder took 248.52 ms. Allocated memory is still 200.3 MB. Free memory was 179.2 MB in the beginning and 166.9 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,799 INFO L168 Benchmark]: TraceAbstraction took 1542.64 ms. Allocated memory was 200.3 MB in the beginning and 227.5 MB in the end (delta: 27.3 MB). Free memory was 166.2 MB in the beginning and 176.5 MB in the end (delta: -10.3 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:23,803 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 136.8 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 268.55 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 90.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.46 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 90.2 MB in the beginning and 179.2 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 248.52 ms. Allocated memory is still 200.3 MB. Free memory was 179.2 MB in the beginning and 166.9 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1542.64 ms. Allocated memory was 200.3 MB in the beginning and 227.5 MB in the end (delta: 27.3 MB). Free memory was 166.2 MB in the beginning and 176.5 MB in the end (delta: -10.3 MB). Peak memory consumption was 16.9 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, sn=0; [L13] i=1 [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND FALSE !(i<=8) [L17] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 10, TraceHistogramMax: 8, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 103 SDtfs, 57 SDslu, 208 SDs, 0 SdLazy, 136 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=9, 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, 9 MinimizatonAttempts, 11 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 208 NumberOfCodeBlocks, 208 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 165 ConstructedInterpolants, 0 QuantifiedInterpolants, 5925 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 140/196 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...