/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/loop-lit/gj2007b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 18:09:01,272 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 18:09:01,274 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 18:09:01,287 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 18:09:01,287 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 18:09:01,288 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 18:09:01,290 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 18:09:01,291 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 18:09:01,293 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 18:09:01,294 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 18:09:01,295 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 18:09:01,296 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 18:09:01,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 18:09:01,297 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 18:09:01,298 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 18:09:01,299 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 18:09:01,300 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 18:09:01,301 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 18:09:01,303 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 18:09:01,305 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 18:09:01,307 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 18:09:01,308 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 18:09:01,309 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 18:09:01,310 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 18:09:01,313 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 18:09:01,316 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-17 18:09:01,317 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-17 18:09:01,318 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-17 18:09:01,318 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-17 18:09:01,319 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-17 18:09:01,320 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-17 18:09:01,320 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-17 18:09:01,321 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-17 18:09:01,321 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 18:09:01,322 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 18:09:01,324 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 18:09:01,325 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 18:09:01,334 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 18:09:01,334 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 18:09:01,336 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 18:09:01,336 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 18:09:01,336 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 18:09:01,336 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 18:09:01,337 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 18:09:01,337 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 18:09:01,337 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 18:09:01,337 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 18:09:01,337 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 18:09:01,338 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 18:09:01,338 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 18:09:01,338 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 18:09:01,338 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 18:09:01,338 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 18:09:01,339 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 18:09:01,339 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 18:09:01,339 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 18:09:01,339 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 18:09:01,339 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 18:09:01,340 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 18:09:01,340 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 [2020-07-17 18:09:01,615 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 18:09:01,625 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 18:09:01,629 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 18:09:01,630 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 18:09:01,631 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 18:09:01,631 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gj2007b.i [2020-07-17 18:09:01,693 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f286e7c60/c88f6f873ca74a0e9b667793c2a86469/FLAG988ff4ca5 [2020-07-17 18:09:02,179 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 18:09:02,180 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007b.i [2020-07-17 18:09:02,186 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f286e7c60/c88f6f873ca74a0e9b667793c2a86469/FLAG988ff4ca5 [2020-07-17 18:09:02,514 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f286e7c60/c88f6f873ca74a0e9b667793c2a86469 [2020-07-17 18:09:02,526 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 18:09:02,531 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 18:09:02,532 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 18:09:02,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 18:09:02,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 18:09:02,536 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,539 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a985fc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02, skipping insertion in model container [2020-07-17 18:09:02,539 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,548 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 18:09:02,566 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 18:09:02,739 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 18:09:02,745 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 18:09:02,765 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 18:09:02,778 INFO L208 MainTranslator]: Completed translation [2020-07-17 18:09:02,779 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02 WrapperNode [2020-07-17 18:09:02,779 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 18:09:02,779 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 18:09:02,779 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 18:09:02,780 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 18:09:02,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,793 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,793 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,796 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,799 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,800 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... [2020-07-17 18:09:02,802 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 18:09:02,802 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 18:09:02,802 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 18:09:02,803 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 18:09:02,803 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 18:09:02,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 18:09:02,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 18:09:02,962 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-17 18:09:02,963 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 18:09:02,963 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 18:09:02,963 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 18:09:02,963 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-17 18:09:02,963 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-17 18:09:02,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 18:09:02,964 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 18:09:02,964 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 18:09:02,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 18:09:02,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 18:09:03,173 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 18:09:03,174 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-17 18:09:03,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 06:09:03 BoogieIcfgContainer [2020-07-17 18:09:03,179 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 18:09:03,181 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 18:09:03,181 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 18:09:03,185 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 18:09:03,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 06:09:02" (1/3) ... [2020-07-17 18:09:03,186 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ee1ff86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 06:09:03, skipping insertion in model container [2020-07-17 18:09:03,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:09:02" (2/3) ... [2020-07-17 18:09:03,187 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ee1ff86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 06:09:03, skipping insertion in model container [2020-07-17 18:09:03,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 06:09:03" (3/3) ... [2020-07-17 18:09:03,190 INFO L109 eAbstractionObserver]: Analyzing ICFG gj2007b.i [2020-07-17 18:09:03,202 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 18:09:03,210 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 18:09:03,243 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 18:09:03,293 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 18:09:03,294 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 18:09:03,294 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-17 18:09:03,294 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 18:09:03,294 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 18:09:03,294 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 18:09:03,294 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 18:09:03,295 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 18:09:03,310 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-17 18:09:03,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-17 18:09:03,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:03,321 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:03,322 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:03,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:03,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1007675669, now seen corresponding path program 1 times [2020-07-17 18:09:03,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:03,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118601079] [2020-07-17 18:09:03,336 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:03,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:03,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118601079] [2020-07-17 18:09:03,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:09:03,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-17 18:09:03,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200255260] [2020-07-17 18:09:03,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-17 18:09:03,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:03,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-17 18:09:03,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 18:09:03,472 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-07-17 18:09:03,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:03,518 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2020-07-17 18:09:03,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-17 18:09:03,520 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2020-07-17 18:09:03,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:03,535 INFO L225 Difference]: With dead ends: 42 [2020-07-17 18:09:03,536 INFO L226 Difference]: Without dead ends: 24 [2020-07-17 18:09:03,543 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 [2020-07-17 18:09:03,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-17 18:09:03,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-17 18:09:03,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-17 18:09:03,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-17 18:09:03,595 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 14 [2020-07-17 18:09:03,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:03,595 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-17 18:09:03,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-17 18:09:03,596 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-17 18:09:03,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-17 18:09:03,596 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:03,597 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:03,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 18:09:03,597 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:03,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:03,598 INFO L82 PathProgramCache]: Analyzing trace with hash 993822854, now seen corresponding path program 1 times [2020-07-17 18:09:03,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:03,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525113887] [2020-07-17 18:09:03,599 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:03,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:03,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525113887] [2020-07-17 18:09:03,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:09:03,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 18:09:03,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883048786] [2020-07-17 18:09:03,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 18:09:03,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:03,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 18:09:03,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-17 18:09:03,716 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-07-17 18:09:03,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:03,791 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-17 18:09:03,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-17 18:09:03,792 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-17 18:09:03,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:03,794 INFO L225 Difference]: With dead ends: 39 [2020-07-17 18:09:03,794 INFO L226 Difference]: Without dead ends: 37 [2020-07-17 18:09:03,796 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 [2020-07-17 18:09:03,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-17 18:09:03,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-07-17 18:09:03,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-17 18:09:03,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-17 18:09:03,809 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 14 [2020-07-17 18:09:03,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:03,810 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-17 18:09:03,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 18:09:03,810 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-17 18:09:03,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-17 18:09:03,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:03,812 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:03,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 18:09:03,813 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:03,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:03,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1988212296, now seen corresponding path program 1 times [2020-07-17 18:09:03,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:03,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858373232] [2020-07-17 18:09:03,814 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:03,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,913 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:03,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858373232] [2020-07-17 18:09:03,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:09:03,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-17 18:09:03,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301875095] [2020-07-17 18:09:03,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 18:09:03,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:03,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 18:09:03,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 18:09:03,916 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 6 states. [2020-07-17 18:09:04,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:04,016 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-07-17 18:09:04,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 18:09:04,016 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-07-17 18:09:04,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:04,020 INFO L225 Difference]: With dead ends: 54 [2020-07-17 18:09:04,020 INFO L226 Difference]: Without dead ends: 42 [2020-07-17 18:09:04,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:09:04,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-17 18:09:04,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-17 18:09:04,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-17 18:09:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-17 18:09:04,033 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 19 [2020-07-17 18:09:04,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:04,033 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-17 18:09:04,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 18:09:04,034 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-17 18:09:04,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-17 18:09:04,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:04,035 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:04,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 18:09:04,036 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:04,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:04,036 INFO L82 PathProgramCache]: Analyzing trace with hash 2096508511, now seen corresponding path program 1 times [2020-07-17 18:09:04,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:04,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224172497] [2020-07-17 18:09:04,037 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:04,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:04,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224172497] [2020-07-17 18:09:04,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:04,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-07-17 18:09:04,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859171945] [2020-07-17 18:09:04,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 18:09:04,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:04,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 18:09:04,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 18:09:04,127 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 6 states. [2020-07-17 18:09:04,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:04,217 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2020-07-17 18:09:04,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 18:09:04,218 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-17 18:09:04,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:04,219 INFO L225 Difference]: With dead ends: 41 [2020-07-17 18:09:04,219 INFO L226 Difference]: Without dead ends: 37 [2020-07-17 18:09:04,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:09:04,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-17 18:09:04,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 27. [2020-07-17 18:09:04,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-17 18:09:04,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-17 18:09:04,230 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20 [2020-07-17 18:09:04,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:04,230 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-17 18:09:04,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 18:09:04,231 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-17 18:09:04,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-17 18:09:04,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:04,232 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:04,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 18:09:04,232 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:04,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:04,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1883436929, now seen corresponding path program 1 times [2020-07-17 18:09:04,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:04,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018553013] [2020-07-17 18:09:04,234 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:04,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:04,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018553013] [2020-07-17 18:09:04,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:04,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-17 18:09:04,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666563365] [2020-07-17 18:09:04,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 18:09:04,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:04,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 18:09:04,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-17 18:09:04,369 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 7 states. [2020-07-17 18:09:04,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:04,482 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-07-17 18:09:04,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 18:09:04,483 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-07-17 18:09:04,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:04,484 INFO L225 Difference]: With dead ends: 35 [2020-07-17 18:09:04,484 INFO L226 Difference]: Without dead ends: 29 [2020-07-17 18:09:04,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-17 18:09:04,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-17 18:09:04,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-17 18:09:04,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-17 18:09:04,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-17 18:09:04,494 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2020-07-17 18:09:04,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:04,494 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-17 18:09:04,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 18:09:04,494 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-17 18:09:04,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-17 18:09:04,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:04,496 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:04,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-17 18:09:04,496 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:04,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:04,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1649594383, now seen corresponding path program 1 times [2020-07-17 18:09:04,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:04,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201010110] [2020-07-17 18:09:04,497 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:04,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:09:04,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201010110] [2020-07-17 18:09:04,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:09:04,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-17 18:09:04,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453449882] [2020-07-17 18:09:04,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 18:09:04,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:04,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 18:09:04,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 18:09:04,594 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 6 states. [2020-07-17 18:09:04,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:04,669 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-07-17 18:09:04,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 18:09:04,670 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-07-17 18:09:04,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:04,670 INFO L225 Difference]: With dead ends: 35 [2020-07-17 18:09:04,670 INFO L226 Difference]: Without dead ends: 0 [2020-07-17 18:09:04,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:09:04,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-17 18:09:04,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-17 18:09:04,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-17 18:09:04,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-17 18:09:04,672 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-17 18:09:04,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:04,672 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-17 18:09:04,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 18:09:04,673 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-17 18:09:04,673 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-17 18:09:04,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-17 18:09:04,676 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-17 18:09:05,191 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L271 CegarLoopResult]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L271 CegarLoopResult]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L271 CegarLoopResult]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2020-07-17 18:09:05,192 INFO L268 CegarLoopResult]: For program point L4-3(lines 3 5) no Hoare annotation was computed. [2020-07-17 18:09:05,193 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-17 18:09:05,193 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-17 18:09:05,193 INFO L268 CegarLoopResult]: For program point L4-1(line 4) no Hoare annotation was computed. [2020-07-17 18:09:05,193 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-17 18:09:05,193 INFO L271 CegarLoopResult]: At program point mainEXIT(lines 13 26) the Hoare annotation is: true [2020-07-17 18:09:05,194 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (let ((.cse0 (<= main_~n~0 0)) (.cse1 (<= 0 main_~m~0)) (.cse2 (<= main_~m~0 main_~x~0))) (or (and (<= main_~x~0 0) .cse0) (and .cse0 .cse1 .cse2) (and (<= (+ main_~m~0 1) main_~n~0) .cse1 .cse2))) [2020-07-17 18:09:05,194 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,203 INFO L264 CegarLoopResult]: At program point L15(line 15) the Hoare annotation is: (and (<= main_~x~0 0) (<= 0 main_~x~0)) [2020-07-17 18:09:05,203 INFO L264 CegarLoopResult]: At program point L17-2(lines 17 22) the Hoare annotation is: (let ((.cse0 (<= 0 main_~m~0)) (.cse1 (<= main_~m~0 main_~x~0))) (or (and (<= main_~n~0 0) .cse0 .cse1) (and (<= (+ main_~m~0 1) main_~n~0) .cse0 .cse1))) [2020-07-17 18:09:05,203 INFO L264 CegarLoopResult]: At program point L17-3(lines 17 22) the Hoare annotation is: (let ((.cse0 (<= main_~n~0 0)) (.cse1 (<= 0 main_~m~0)) (.cse2 (<= main_~m~0 main_~x~0))) (or (and (<= main_~x~0 0) .cse0 .cse1) (and .cse0 .cse1 .cse2) (and (<= (+ main_~m~0 1) main_~n~0) .cse1 .cse2))) [2020-07-17 18:09:05,203 INFO L271 CegarLoopResult]: At program point mainFINAL(lines 13 26) the Hoare annotation is: true [2020-07-17 18:09:05,204 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 26) the Hoare annotation is: true [2020-07-17 18:09:05,204 INFO L271 CegarLoopResult]: At program point L24(line 24) the Hoare annotation is: true [2020-07-17 18:09:05,204 INFO L264 CegarLoopResult]: At program point L18(line 18) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,204 INFO L264 CegarLoopResult]: At program point L18-1(lines 18 20) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,204 INFO L264 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: (and (<= main_~x~0 0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,205 INFO L264 CegarLoopResult]: At program point L18-2(line 18) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,205 INFO L264 CegarLoopResult]: At program point L16-1(line 16) the Hoare annotation is: (and (<= main_~x~0 0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,205 INFO L264 CegarLoopResult]: At program point L16-2(line 16) the Hoare annotation is: (and (<= main_~x~0 0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,205 INFO L264 CegarLoopResult]: At program point L18-4(line 18) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,205 INFO L264 CegarLoopResult]: At program point L18-5(lines 18 20) the Hoare annotation is: (and (<= (+ main_~x~0 1) main_~n~0) (<= 0 main_~m~0) (<= main_~m~0 main_~x~0)) [2020-07-17 18:09:05,206 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-17 18:09:05,206 INFO L264 CegarLoopResult]: At program point __VERIFIER_assertEXIT(lines 6 11) the Hoare annotation is: (or (= 0 |__VERIFIER_assert_#in~cond|) (not (= 0 __VERIFIER_assert_~cond))) [2020-07-17 18:09:05,206 INFO L264 CegarLoopResult]: At program point L8(line 8) the Hoare annotation is: (= 0 |__VERIFIER_assert_#in~cond|) [2020-07-17 18:09:05,207 INFO L264 CegarLoopResult]: At program point L7(lines 7 9) the Hoare annotation is: (or (= 0 |__VERIFIER_assert_#in~cond|) (not (= 0 __VERIFIER_assert_~cond))) [2020-07-17 18:09:05,208 INFO L264 CegarLoopResult]: At program point L7-2(lines 6 11) the Hoare annotation is: (or (= 0 |__VERIFIER_assert_#in~cond|) (not (= 0 __VERIFIER_assert_~cond))) [2020-07-17 18:09:05,208 INFO L264 CegarLoopResult]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) the Hoare annotation is: (= 0 |__VERIFIER_assert_#in~cond|) [2020-07-17 18:09:05,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 06:09:05 BoogieIcfgContainer [2020-07-17 18:09:05,262 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 18:09:05,265 INFO L168 Benchmark]: Toolchain (without parser) took 2735.00 ms. Allocated memory was 145.8 MB in the beginning and 234.9 MB in the end (delta: 89.1 MB). Free memory was 102.9 MB in the beginning and 116.5 MB in the end (delta: -13.6 MB). Peak memory consumption was 75.5 MB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,267 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 145.8 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,271 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.12 ms. Allocated memory is still 145.8 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,273 INFO L168 Benchmark]: Boogie Preprocessor took 22.54 ms. Allocated memory is still 145.8 MB. Free memory was 93.1 MB in the beginning and 91.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,276 INFO L168 Benchmark]: RCFGBuilder took 377.29 ms. Allocated memory was 145.8 MB in the beginning and 202.9 MB in the end (delta: 57.1 MB). Free memory was 91.7 MB in the beginning and 170.0 MB in the end (delta: -78.3 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,277 INFO L168 Benchmark]: TraceAbstraction took 2081.08 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 169.3 MB in the beginning and 116.5 MB in the end (delta: 52.8 MB). Peak memory consumption was 84.8 MB. Max. memory is 7.1 GB. [2020-07-17 18:09:05,284 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 145.8 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.12 ms. Allocated memory is still 145.8 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.54 ms. Allocated memory is still 145.8 MB. Free memory was 93.1 MB in the beginning and 91.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 377.29 ms. Allocated memory was 145.8 MB in the beginning and 202.9 MB in the end (delta: 57.1 MB). Free memory was 91.7 MB in the beginning and 170.0 MB in the end (delta: -78.3 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2081.08 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 169.3 MB in the beginning and 116.5 MB in the end (delta: 52.8 MB). Peak memory consumption was 84.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 17]: Loop Invariant Derived loop invariant: ((n <= 0 && 0 <= m) && m <= x) || ((m + 1 <= n && 0 <= m) && m <= x) - ProcedureContractResult [Line: 13]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 6]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 0 == \old(cond) || !(0 == cond) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1.3s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 81 SDslu, 338 SDs, 0 SdLazy, 137 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=3, 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, 6 MinimizatonAttempts, 21 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 29 LocationsWithAnnotation, 71 PreInvPairs, 111 NumberOfFragments, 236 HoareAnnotationTreeSize, 71 FomulaSimplifications, 327 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 29 FomulaSimplificationsInter, 246 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 116 NumberOfCodeBlocks, 116 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 110 ConstructedInterpolants, 0 QuantifiedInterpolants, 5512 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 7/9 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 correct! Received shutdown request...