java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:25:42,222 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:25:42,224 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:25:42,235 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-20 13:25:42,236 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-20 13:25:42,237 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-20 13:25:42,238 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-20 13:25:42,240 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-20 13:25:42,242 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-20 13:25:42,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-20 13:25:42,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-20 13:25:42,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-20 13:25:42,245 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 13:25:42,246 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 13:25:42,247 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 13:25:42,249 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 13:25:42,250 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 13:25:42,251 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 13:25:42,252 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 13:25:42,254 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 13:25:42,256 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 13:25:42,257 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 13:25:42,258 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 13:25:42,259 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 13:25:42,261 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-20 13:25:42,261 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-20 13:25:42,262 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-20 13:25:42,263 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-20 13:25:42,263 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-20 13:25:42,264 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-20 13:25:42,264 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-20 13:25:42,265 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-20 13:25:42,266 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-20 13:25:42,267 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-20 13:25:42,268 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-20 13:25:42,268 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-20 13:25:42,269 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-20 13:25:42,269 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-20 13:25:42,269 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:25:42,270 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:25:42,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:25:42,272 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-20 13:25:42,288 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:25:42,288 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:25:42,290 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:25:42,290 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:25:42,291 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:25:42,291 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:25:42,291 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:25:42,291 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:25:42,292 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:25:42,292 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:25:42,293 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:25:42,293 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:25:42,293 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:25:42,293 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:25:42,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:25:42,294 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:25:42,294 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:25:42,294 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:25:42,295 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:25:42,295 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:25:42,296 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:25:42,296 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:25:42,296 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:25:42,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:25:42,297 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:25:42,297 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:25:42,298 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:25:42,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:25:42,298 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:25:42,298 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:25:42,348 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:25:42,359 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:25:42,362 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:25:42,364 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:25:42,364 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:25:42,365 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2019-09-20 13:25:42,436 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c56c0867/8f5342687c594b9cbd58906f3b501ec0/FLAG575be743b [2019-09-20 13:25:42,923 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:25:42,923 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2019-09-20 13:25:42,929 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c56c0867/8f5342687c594b9cbd58906f3b501ec0/FLAG575be743b [2019-09-20 13:25:43,321 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c56c0867/8f5342687c594b9cbd58906f3b501ec0 [2019-09-20 13:25:43,333 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:25:43,335 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:25:43,336 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:43,336 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:25:43,340 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:25:43,341 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,344 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@184d652c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43, skipping insertion in model container [2019-09-20 13:25:43,344 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,352 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:25:43,371 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:25:43,547 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:43,552 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:25:43,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:43,581 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:25:43,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43 WrapperNode [2019-09-20 13:25:43,582 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:43,583 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:25:43,583 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:25:43,583 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:25:43,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,699 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,704 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,706 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (1/1) ... [2019-09-20 13:25:43,707 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:25:43,708 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:25:43,708 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:25:43,708 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:25:43,709 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (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 [2019-09-20 13:25:43,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:25:43,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:25:43,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:25:43,774 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:25:43,774 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:25:43,774 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-20 13:25:43,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:25:43,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 13:25:43,775 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:25:43,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:25:43,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:25:44,032 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:25:44,033 INFO L283 CfgBuilder]: Removed 3 assume(true) statements. [2019-09-20 13:25:44,034 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:44 BoogieIcfgContainer [2019-09-20 13:25:44,043 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:25:44,045 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:25:44,045 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:25:44,054 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:25:44,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:25:43" (1/3) ... [2019-09-20 13:25:44,055 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a997693 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:44, skipping insertion in model container [2019-09-20 13:25:44,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:43" (2/3) ... [2019-09-20 13:25:44,056 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a997693 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:44, skipping insertion in model container [2019-09-20 13:25:44,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:44" (3/3) ... [2019-09-20 13:25:44,061 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2019-09-20 13:25:44,081 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:25:44,088 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:25:44,107 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:25:44,136 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:25:44,136 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:25:44,136 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:25:44,136 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:25:44,136 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:25:44,137 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:25:44,137 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:25:44,137 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:25:44,150 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-09-20 13:25:44,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-20 13:25:44,159 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:44,160 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:44,162 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:44,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:44,167 INFO L82 PathProgramCache]: Analyzing trace with hash -810471198, now seen corresponding path program 1 times [2019-09-20 13:25:44,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:44,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:44,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:44,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:44,216 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:44,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:44,494 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:25:44,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2019-09-20 13:25:44,495 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:44,500 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-20 13:25:44,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-20 13:25:44,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2019-09-20 13:25:44,520 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 8 states. [2019-09-20 13:25:44,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:44,789 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2019-09-20 13:25:44,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:25:44,792 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-09-20 13:25:44,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:44,802 INFO L225 Difference]: With dead ends: 43 [2019-09-20 13:25:44,803 INFO L226 Difference]: Without dead ends: 35 [2019-09-20 13:25:44,805 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2019-09-20 13:25:44,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-09-20 13:25:44,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-09-20 13:25:44,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-09-20 13:25:44,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2019-09-20 13:25:44,850 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 18 [2019-09-20 13:25:44,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:44,851 INFO L475 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2019-09-20 13:25:44,851 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-20 13:25:44,851 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2019-09-20 13:25:44,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-09-20 13:25:44,853 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:44,853 INFO L407 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:44,853 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:44,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:44,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1809643041, now seen corresponding path program 1 times [2019-09-20 13:25:44,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:44,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:44,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:44,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:44,857 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:44,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:44,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:44,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:44,994 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:44,995 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2019-09-20 13:25:44,997 INFO L207 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [17], [20], [24], [32], [38], [40], [48], [59], [65], [68], [70], [76], [77], [78], [80] [2019-09-20 13:25:45,029 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:25:45,029 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:25:45,139 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:25:45,141 INFO L272 AbstractInterpreter]: Visited 20 different actions 23 times. Merged at 2 different actions 2 times. Never widened. Performed 35 root evaluator evaluations with a maximum evaluation depth of 5. Performed 35 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 12 variables. [2019-09-20 13:25:45,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:45,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:25:45,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:45,146 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:45,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:45,172 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:25:45,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:45,198 INFO L256 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 13:25:45,207 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:45,294 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:25:45,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:45,348 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:45,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:45,475 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-09-20 13:25:45,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2019-09-20 13:25:45,476 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:45,477 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-20 13:25:45,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-20 13:25:45,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2019-09-20 13:25:45,480 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2019-09-20 13:25:45,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:45,615 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2019-09-20 13:25:45,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-20 13:25:45,616 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-09-20 13:25:45,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:45,617 INFO L225 Difference]: With dead ends: 45 [2019-09-20 13:25:45,618 INFO L226 Difference]: Without dead ends: 45 [2019-09-20 13:25:45,619 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2019-09-20 13:25:45,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-09-20 13:25:45,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2019-09-20 13:25:45,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-09-20 13:25:45,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-09-20 13:25:45,626 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 21 [2019-09-20 13:25:45,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:45,626 INFO L475 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-09-20 13:25:45,627 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-20 13:25:45,627 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-09-20 13:25:45,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-20 13:25:45,628 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:45,628 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:45,628 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:45,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:45,629 INFO L82 PathProgramCache]: Analyzing trace with hash 2040308290, now seen corresponding path program 1 times [2019-09-20 13:25:45,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:45,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:45,631 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:45,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:45,631 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:45,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:45,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:45,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:45,798 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:45,798 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 29 with the following transitions: [2019-09-20 13:25:45,798 INFO L207 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [17], [20], [24], [32], [38], [40], [48], [51], [59], [65], [68], [70], [73], [75], [76], [77], [78], [80], [81] [2019-09-20 13:25:45,802 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:25:45,803 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:25:45,883 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:25:45,883 INFO L272 AbstractInterpreter]: Visited 24 different actions 28 times. Merged at 3 different actions 3 times. Never widened. Performed 41 root evaluator evaluations with a maximum evaluation depth of 7. Performed 41 inverse root evaluator evaluations with a maximum inverse evaluation depth of 7. Found 2 fixpoints after 2 different actions. Largest state had 13 variables. [2019-09-20 13:25:45,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:45,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:25:45,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:45,884 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-20 13:25:45,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:45,906 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:45,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:45,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 13:25:45,927 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:46,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:46,038 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:46,143 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:46,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:46,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 18 [2019-09-20 13:25:46,148 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:46,149 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-20 13:25:46,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-20 13:25:46,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2019-09-20 13:25:46,150 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 15 states. [2019-09-20 13:25:46,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:46,854 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2019-09-20 13:25:46,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-20 13:25:46,855 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2019-09-20 13:25:46,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:46,859 INFO L225 Difference]: With dead ends: 68 [2019-09-20 13:25:46,861 INFO L226 Difference]: Without dead ends: 68 [2019-09-20 13:25:46,863 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=243, Invalid=947, Unknown=0, NotChecked=0, Total=1190 [2019-09-20 13:25:46,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-20 13:25:46,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 57. [2019-09-20 13:25:46,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-09-20 13:25:46,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2019-09-20 13:25:46,881 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 28 [2019-09-20 13:25:46,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:46,881 INFO L475 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2019-09-20 13:25:46,882 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-20 13:25:46,882 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2019-09-20 13:25:46,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-09-20 13:25:46,884 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:46,884 INFO L407 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:46,885 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:46,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:46,885 INFO L82 PathProgramCache]: Analyzing trace with hash -612204525, now seen corresponding path program 1 times [2019-09-20 13:25:46,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:46,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:46,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:46,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:46,887 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:46,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:47,059 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-20 13:25:47,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:47,060 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:47,060 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 38 with the following transitions: [2019-09-20 13:25:47,060 INFO L207 CegarAbsIntRunner]: [0], [1], [5], [9], [13], [17], [20], [24], [32], [38], [40], [46], [48], [51], [55], [59], [65], [68], [70], [73], [75], [76], [77], [78], [80], [81] [2019-09-20 13:25:47,062 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:25:47,063 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:25:47,166 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:25:47,167 INFO L272 AbstractInterpreter]: Visited 26 different actions 84 times. Merged at 9 different actions 30 times. Widened at 3 different actions 4 times. Performed 158 root evaluator evaluations with a maximum evaluation depth of 7. Performed 158 inverse root evaluator evaluations with a maximum inverse evaluation depth of 7. Found 11 fixpoints after 6 different actions. Largest state had 14 variables. [2019-09-20 13:25:47,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:47,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:25:47,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:47,171 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:47,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:47,194 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:25:47,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:47,211 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 13:25:47,213 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:47,287 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-20 13:25:47,287 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:47,356 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-09-20 13:25:47,360 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-09-20 13:25:47,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [15, 6] total 20 [2019-09-20 13:25:47,361 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:47,361 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-20 13:25:47,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-20 13:25:47,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:25:47,362 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand 6 states. [2019-09-20 13:25:47,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:47,443 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2019-09-20 13:25:47,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:25:47,444 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 37 [2019-09-20 13:25:47,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:47,446 INFO L225 Difference]: With dead ends: 60 [2019-09-20 13:25:47,448 INFO L226 Difference]: Without dead ends: 60 [2019-09-20 13:25:47,449 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2019-09-20 13:25:47,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-09-20 13:25:47,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2019-09-20 13:25:47,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-09-20 13:25:47,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2019-09-20 13:25:47,463 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 37 [2019-09-20 13:25:47,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:47,469 INFO L475 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2019-09-20 13:25:47,469 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-20 13:25:47,469 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2019-09-20 13:25:47,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-20 13:25:47,473 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:47,473 INFO L407 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:47,474 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:47,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:47,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1320897281, now seen corresponding path program 2 times [2019-09-20 13:25:47,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:47,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:47,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:47,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:47,479 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:47,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:47,648 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 13 proven. 29 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-20 13:25:47,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:47,649 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:47,649 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:47,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:47,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:47,650 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:47,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:47,665 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:25:47,681 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2019-09-20 13:25:47,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:47,682 INFO L256 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:25:47,685 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:47,735 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:25:47,772 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 33 proven. 1 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-09-20 13:25:47,772 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:47,842 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-09-20 13:25:47,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:47,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 19 [2019-09-20 13:25:47,852 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:47,853 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-20 13:25:47,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-20 13:25:47,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2019-09-20 13:25:47,854 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand 16 states. [2019-09-20 13:25:48,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:48,591 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2019-09-20 13:25:48,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-20 13:25:48,592 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 51 [2019-09-20 13:25:48,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:48,593 INFO L225 Difference]: With dead ends: 71 [2019-09-20 13:25:48,593 INFO L226 Difference]: Without dead ends: 0 [2019-09-20 13:25:48,595 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2019-09-20 13:25:48,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-20 13:25:48,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-20 13:25:48,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-20 13:25:48,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-20 13:25:48,596 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 51 [2019-09-20 13:25:48,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:48,596 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-20 13:25:48,597 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-20 13:25:48,597 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-20 13:25:48,597 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-20 13:25:48,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.09 01:25:48 BoogieIcfgContainer [2019-09-20 13:25:48,601 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-20 13:25:48,604 INFO L168 Benchmark]: Toolchain (without parser) took 5268.22 ms. Allocated memory was 138.9 MB in the beginning and 264.8 MB in the end (delta: 125.8 MB). Free memory was 87.1 MB in the beginning and 145.9 MB in the end (delta: -58.7 MB). Peak memory consumption was 67.1 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,605 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 105.0 MB in the beginning and 104.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,606 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.19 ms. Allocated memory is still 138.9 MB. Free memory was 86.9 MB in the beginning and 77.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,607 INFO L168 Benchmark]: Boogie Preprocessor took 125.16 ms. Allocated memory was 138.9 MB in the beginning and 199.2 MB in the end (delta: 60.3 MB). Free memory was 77.3 MB in the beginning and 176.5 MB in the end (delta: -99.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,608 INFO L168 Benchmark]: RCFGBuilder took 335.39 ms. Allocated memory is still 199.2 MB. Free memory was 176.5 MB in the beginning and 162.4 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,609 INFO L168 Benchmark]: TraceAbstraction took 4556.89 ms. Allocated memory was 199.2 MB in the beginning and 264.8 MB in the end (delta: 65.5 MB). Free memory was 161.8 MB in the beginning and 145.9 MB in the end (delta: 15.9 MB). Peak memory consumption was 81.5 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:48,614 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 105.0 MB in the beginning and 104.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.19 ms. Allocated memory is still 138.9 MB. Free memory was 86.9 MB in the beginning and 77.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.16 ms. Allocated memory was 138.9 MB in the beginning and 199.2 MB in the end (delta: 60.3 MB). Free memory was 77.3 MB in the beginning and 176.5 MB in the end (delta: -99.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 335.39 ms. Allocated memory is still 199.2 MB. Free memory was 176.5 MB in the beginning and 162.4 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4556.89 ms. Allocated memory was 199.2 MB in the beginning and 264.8 MB in the end (delta: 65.5 MB). Free memory was 161.8 MB in the beginning and 145.9 MB in the end (delta: 15.9 MB). Peak memory consumption was 81.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 29 locations, 1 error locations. SAFE Result, 4.4s OverallTime, 5 OverallIterations, 4 TraceHistogramMax, 1.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 105 SDtfs, 161 SDslu, 528 SDs, 0 SdLazy, 706 SolverSat, 115 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 366 GetRequests, 246 SyntacticMatches, 4 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=57occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 20 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 292 NumberOfCodeBlocks, 259 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 416 ConstructedInterpolants, 0 QuantifiedInterpolants, 43371 SizeOfPredicates, 16 NumberOfNonLiveVariables, 264 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 13 InterpolantComputations, 3 PerfectInterpolantSequences, 198/267 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...