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-acceleration/underapprox_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 13:00:34,400 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 13:00:34,402 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 13:00:34,418 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 13:00:34,443 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 13:00:34,445 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 13:00:34,447 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 13:00:34,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 13:00:34,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 13:00:34,451 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 13:00:34,453 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 13:00:34,458 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 13:00:34,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 13:00:34,462 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 13:00:34,463 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 13:00:34,464 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 13:00:34,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-05 13:00:34,468 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-05 13:00:34,469 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-05 13:00:34,469 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-05 13:00:34,470 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-05 13:00:34,471 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-05 13:00:34,471 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-05 13:00:34,473 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-05 13:00:34,473 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-05 13:00:34,473 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-05 13:00:34,474 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-05 13:00:34,474 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-05 13:00:34,475 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 [2019-09-05 13:00:34,502 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 13:00:34,503 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 13:00:34,503 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-05 13:00:34,505 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-05 13:00:34,506 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-05 13:00:34,506 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-05 13:00:34,507 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-05 13:00:34,507 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-05 13:00:34,507 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-05 13:00:34,507 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-05 13:00:34,508 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 13:00:34,508 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 13:00:34,509 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 13:00:34,509 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 13:00:34,509 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 13:00:34,510 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 13:00:34,510 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 13:00:34,510 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 13:00:34,510 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 13:00:34,511 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 13:00:34,511 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 13:00:34,511 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-05 13:00:34,511 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 13:00:34,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 13:00:34,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 13:00:34,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 13:00:34,512 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-05 13:00:34,512 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 13:00:34,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 13:00:34,513 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-05 13:00:34,560 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 13:00:34,573 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 13:00:34,576 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 13:00:34,577 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 13:00:34,578 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 13:00:34,578 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2019-09-05 13:00:34,635 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43eb85da4/929e7feb9ee942d68deb9fac6d88e026/FLAG0edc7fedf [2019-09-05 13:00:35,045 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 13:00:35,046 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2019-09-05 13:00:35,052 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43eb85da4/929e7feb9ee942d68deb9fac6d88e026/FLAG0edc7fedf [2019-09-05 13:00:35,427 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43eb85da4/929e7feb9ee942d68deb9fac6d88e026 [2019-09-05 13:00:35,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 13:00:35,436 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 13:00:35,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:35,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 13:00:35,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 13:00:35,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,444 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63f255d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35, skipping insertion in model container [2019-09-05 13:00:35,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,452 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 13:00:35,466 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 13:00:35,632 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:35,636 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 13:00:35,650 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:35,660 INFO L192 MainTranslator]: Completed translation [2019-09-05 13:00:35,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35 WrapperNode [2019-09-05 13:00:35,661 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:35,662 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 13:00:35,662 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 13:00:35,662 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 13:00:35,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,759 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,759 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,763 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (1/1) ... [2019-09-05 13:00:35,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 13:00:35,769 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 13:00:35,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 13:00:35,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 13:00:35,770 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (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 [2019-09-05 13:00:35,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 13:00:35,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 13:00:35,819 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 13:00:35,820 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 13:00:35,820 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 13:00:35,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 13:00:35,821 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 13:00:35,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 13:00:35,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 13:00:35,971 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 13:00:35,972 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 13:00:35,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:35 BoogieIcfgContainer [2019-09-05 13:00:35,974 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 13:00:35,975 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 13:00:35,975 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 13:00:35,980 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 13:00:35,980 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 01:00:35" (1/3) ... [2019-09-05 13:00:35,981 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47b54fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:35, skipping insertion in model container [2019-09-05 13:00:35,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:35" (2/3) ... [2019-09-05 13:00:35,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47b54fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:35, skipping insertion in model container [2019-09-05 13:00:35,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:35" (3/3) ... [2019-09-05 13:00:35,983 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2019-09-05 13:00:35,990 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 13:00:35,996 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 13:00:36,011 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 13:00:36,036 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 13:00:36,036 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-05 13:00:36,036 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 13:00:36,036 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 13:00:36,036 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 13:00:36,037 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 13:00:36,037 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 13:00:36,037 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 13:00:36,049 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-05 13:00:36,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 13:00:36,057 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:36,058 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:36,059 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:36,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:36,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-05 13:00:36,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:36,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:36,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,103 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:36,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:36,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:36,260 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:00:36,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 13:00:36,261 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:00:36,266 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 13:00:36,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 13:00:36,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 13:00:36,295 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-09-05 13:00:36,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:36,373 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-05 13:00:36,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 13:00:36,375 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 13:00:36,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:36,385 INFO L225 Difference]: With dead ends: 18 [2019-09-05 13:00:36,385 INFO L226 Difference]: Without dead ends: 12 [2019-09-05 13:00:36,387 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 13:00:36,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-05 13:00:36,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-05 13:00:36,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-05 13:00:36,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-05 13:00:36,444 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-05 13:00:36,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:36,444 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-05 13:00:36,444 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 13:00:36,444 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-05 13:00:36,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-05 13:00:36,445 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:36,445 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:36,446 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:36,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:36,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-05 13:00:36,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:36,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:36,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,451 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:36,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:36,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:36,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:36,558 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:36,559 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-05 13:00:36,560 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-05 13:00:36,589 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:00:36,590 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:00:36,648 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-05 13:00:36,701 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:00:36,704 INFO L272 AbstractInterpreter]: Visited 11 different actions 41 times. Merged at 2 different actions 10 times. Widened at 1 different actions 3 times. Performed 74 root evaluator evaluations with a maximum evaluation depth of 5. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-05 13:00:36,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:36,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:00:36,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:36,709 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) [2019-09-05 13:00:36,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:36,730 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:36,754 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 13:00:36,759 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:36,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:36,787 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:36,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 13:00:36,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:36,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 10 [2019-09-05 13:00:36,903 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:36,904 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 13:00:36,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 13:00:36,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-09-05 13:00:36,905 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2019-09-05 13:00:36,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:36,932 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-05 13:00:36,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-05 13:00:36,935 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-09-05 13:00:36,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:36,935 INFO L225 Difference]: With dead ends: 13 [2019-09-05 13:00:36,935 INFO L226 Difference]: Without dead ends: 13 [2019-09-05 13:00:36,937 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-09-05 13:00:36,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-05 13:00:36,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-05 13:00:36,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-05 13:00:36,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-05 13:00:36,941 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-05 13:00:36,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:36,942 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-05 13:00:36,942 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 13:00:36,944 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-05 13:00:36,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-05 13:00:36,944 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:36,945 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:36,945 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:36,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:36,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-05 13:00:36,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:36,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:36,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:36,947 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:36,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:37,040 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,040 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:37,040 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:37,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:37,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,041 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) [2019-09-05 13:00:37,054 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:37,055 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:37,066 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 13:00:37,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:37,067 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 13:00:37,069 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:37,091 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,091 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:37,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:37,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 12 [2019-09-05 13:00:37,223 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:37,224 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-05 13:00:37,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-05 13:00:37,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:00:37,225 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-05 13:00:37,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:37,261 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-05 13:00:37,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-05 13:00:37,263 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2019-09-05 13:00:37,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:37,264 INFO L225 Difference]: With dead ends: 14 [2019-09-05 13:00:37,264 INFO L226 Difference]: Without dead ends: 14 [2019-09-05 13:00:37,265 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:00:37,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-05 13:00:37,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-05 13:00:37,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 13:00:37,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-05 13:00:37,270 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-05 13:00:37,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:37,270 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-05 13:00:37,271 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-05 13:00:37,271 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-05 13:00:37,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 13:00:37,272 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:37,272 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:37,273 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:37,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:37,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-05 13:00:37,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:37,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:37,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:37,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:37,275 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:37,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:37,436 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,436 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:37,436 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:37,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:37,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,437 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) [2019-09-05 13:00:37,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:00:37,451 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:37,462 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:00:37,462 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:37,463 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 13:00:37,464 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:37,483 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,483 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:37,646 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:37,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 14 [2019-09-05 13:00:37,650 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:37,650 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 13:00:37,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 13:00:37,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:00:37,652 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2019-09-05 13:00:37,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:37,697 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-05 13:00:37,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:00:37,698 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-09-05 13:00:37,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:37,699 INFO L225 Difference]: With dead ends: 15 [2019-09-05 13:00:37,699 INFO L226 Difference]: Without dead ends: 15 [2019-09-05 13:00:37,699 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:00:37,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-05 13:00:37,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-05 13:00:37,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-05 13:00:37,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-05 13:00:37,703 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-05 13:00:37,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:37,703 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-05 13:00:37,703 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 13:00:37,703 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-05 13:00:37,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-05 13:00:37,704 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:37,704 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:37,704 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:37,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:37,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-05 13:00:37,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:37,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:37,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:37,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:37,707 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:37,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:37,808 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,809 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:37,809 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:37,809 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:37,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:37,810 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) [2019-09-05 13:00:37,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:37,834 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:37,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:37,850 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-05 13:00:37,851 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:37,873 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:38,065 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:38,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:38,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 10] total 16 [2019-09-05 13:00:38,071 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:38,072 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-05 13:00:38,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-05 13:00:38,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:00:38,073 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2019-09-05 13:00:38,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:38,115 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-05 13:00:38,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 13:00:38,116 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-09-05 13:00:38,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:38,117 INFO L225 Difference]: With dead ends: 16 [2019-09-05 13:00:38,117 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 13:00:38,117 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:00:38,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 13:00:38,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 13:00:38,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 13:00:38,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-05 13:00:38,120 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-05 13:00:38,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:38,121 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-05 13:00:38,121 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-05 13:00:38,121 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-05 13:00:38,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-05 13:00:38,121 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:38,122 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:38,122 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:38,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:38,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-05 13:00:38,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:38,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:38,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:38,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:38,124 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:38,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:38,224 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:38,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:38,225 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:38,225 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:38,225 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:38,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:38,225 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:38,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:38,241 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:00:38,251 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 13:00:38,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:38,252 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-05 13:00:38,253 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:38,318 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:00:38,346 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-05 13:00:38,347 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:38,459 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-09-05 13:00:38,463 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-09-05 13:00:38,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [8] total 15 [2019-09-05 13:00:38,464 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:00:38,464 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-05 13:00:38,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-05 13:00:38,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2019-09-05 13:00:38,465 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 6 states. [2019-09-05 13:00:38,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:38,511 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-05 13:00:38,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:00:38,511 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-09-05 13:00:38,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:38,512 INFO L225 Difference]: With dead ends: 14 [2019-09-05 13:00:38,512 INFO L226 Difference]: Without dead ends: 0 [2019-09-05 13:00:38,513 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:00:38,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-05 13:00:38,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-05 13:00:38,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-05 13:00:38,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-05 13:00:38,514 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2019-09-05 13:00:38,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:38,514 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-05 13:00:38,514 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-05 13:00:38,514 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-05 13:00:38,515 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-05 13:00:38,520 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.09 01:00:38 BoogieIcfgContainer [2019-09-05 13:00:38,520 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-05 13:00:38,522 INFO L168 Benchmark]: Toolchain (without parser) took 3085.10 ms. Allocated memory was 141.0 MB in the beginning and 227.5 MB in the end (delta: 86.5 MB). Free memory was 87.3 MB in the beginning and 88.9 MB in the end (delta: -1.7 MB). Peak memory consumption was 84.9 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,523 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 141.0 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,524 INFO L168 Benchmark]: CACSL2BoogieTranslator took 224.16 ms. Allocated memory is still 141.0 MB. Free memory was 86.8 MB in the beginning and 77.9 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,525 INFO L168 Benchmark]: Boogie Preprocessor took 107.40 ms. Allocated memory was 141.0 MB in the beginning and 200.8 MB in the end (delta: 59.8 MB). Free memory was 77.9 MB in the beginning and 178.9 MB in the end (delta: -101.0 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,526 INFO L168 Benchmark]: RCFGBuilder took 205.25 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 168.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,527 INFO L168 Benchmark]: TraceAbstraction took 2544.57 ms. Allocated memory was 200.8 MB in the beginning and 227.5 MB in the end (delta: 26.7 MB). Free memory was 168.4 MB in the beginning and 88.9 MB in the end (delta: 79.5 MB). Peak memory consumption was 106.2 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:38,531 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 141.0 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 224.16 ms. Allocated memory is still 141.0 MB. Free memory was 86.8 MB in the beginning and 77.9 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.40 ms. Allocated memory was 141.0 MB in the beginning and 200.8 MB in the end (delta: 59.8 MB). Free memory was 77.9 MB in the beginning and 178.9 MB in the end (delta: -101.0 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 205.25 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 168.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2544.57 ms. Allocated memory was 200.8 MB in the beginning and 227.5 MB in the end (delta: 26.7 MB). Free memory was 168.4 MB in the beginning and 88.9 MB in the end (delta: 79.5 MB). Peak memory consumption was 106.2 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, 17 locations, 1 error locations. SAFE Result, 2.4s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 63 SDtfs, 2 SDslu, 144 SDs, 0 SdLazy, 96 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 165 GetRequests, 91 SyntacticMatches, 15 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 140 NumberOfCodeBlocks, 137 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 8389 SizeOfPredicates, 3 NumberOfNonLiveVariables, 180 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 16 InterpolantComputations, 3 PerfectInterpolantSequences, 30/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...