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_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 20:51:11,153 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:51:11,156 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:51:11,170 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-03 20:51:11,179 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 20:51:11,180 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 20:51:11,181 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 20:51:11,182 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 20:51:11,183 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 20:51:11,184 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 20:51:11,185 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 20:51:11,187 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 20:51:11,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 20:51:11,189 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 20:51:11,190 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 20:51:11,191 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 20:51:11,193 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 20:51:11,196 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 20:51:11,197 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 20:51:11,198 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 20:51:11,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 20:51:11,202 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 20:51:11,202 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 20:51:11,204 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 20:51:11,204 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 20:51:11,204 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 20:51:11,205 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 20:51:11,205 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 20:51:11,206 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 [2019-09-03 20:51:11,233 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:51:11,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:51:11,235 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 20:51:11,235 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 20:51:11,236 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 20:51:11,236 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 20:51:11,237 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 20:51:11,237 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 20:51:11,237 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 20:51:11,237 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 20:51:11,239 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:51:11,240 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:51:11,240 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:51:11,240 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:51:11,241 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:51:11,241 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:51:11,241 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:51:11,241 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:51:11,241 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:51:11,242 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:51:11,242 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:51:11,242 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 20:51:11,242 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:51:11,243 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:51:11,243 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:51:11,243 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:51:11,243 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 20:51:11,244 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:51:11,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:51:11,244 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 20:51:11,290 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:51:11,301 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:51:11,305 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:51:11,306 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:51:11,306 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:51:11,307 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-09-03 20:51:11,364 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a9d103f2d/12161678fd994110aa9b97a0652db081/FLAG35895fbb5 [2019-09-03 20:51:11,736 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:51:11,737 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-2.c [2019-09-03 20:51:11,743 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a9d103f2d/12161678fd994110aa9b97a0652db081/FLAG35895fbb5 [2019-09-03 20:51:12,116 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a9d103f2d/12161678fd994110aa9b97a0652db081 [2019-09-03 20:51:12,124 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:51:12,126 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:51:12,127 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:51:12,127 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:51:12,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:51:12,131 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,134 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@621c7695 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12, skipping insertion in model container [2019-09-03 20:51:12,134 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,141 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:51:12,156 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:51:12,332 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:51:12,342 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:51:12,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:51:12,378 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:51:12,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12 WrapperNode [2019-09-03 20:51:12,379 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:51:12,380 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:51:12,380 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:51:12,380 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:51:12,484 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,491 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,492 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,501 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,505 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,506 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (1/1) ... [2019-09-03 20:51:12,507 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:51:12,507 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:51:12,507 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:51:12,507 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:51:12,508 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (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 [2019-09-03 20:51:12,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:51:12,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:51:12,552 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:51:12,553 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:51:12,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:51:12,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:51:12,553 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:51:12,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:51:12,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:51:12,722 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:51:12,722 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 20:51:12,723 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:51:12 BoogieIcfgContainer [2019-09-03 20:51:12,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:51:12,724 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:51:12,725 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:51:12,727 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:51:12,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:51:12" (1/3) ... [2019-09-03 20:51:12,729 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@452f0632 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:51:12, skipping insertion in model container [2019-09-03 20:51:12,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:51:12" (2/3) ... [2019-09-03 20:51:12,729 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@452f0632 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:51:12, skipping insertion in model container [2019-09-03 20:51:12,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:51:12" (3/3) ... [2019-09-03 20:51:12,731 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2019-09-03 20:51:12,739 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:51:12,745 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:51:12,758 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:51:12,783 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:51:12,783 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 20:51:12,783 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:51:12,784 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:51:12,784 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:51:12,784 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:51:12,784 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:51:12,784 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:51:12,797 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-03 20:51:12,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 20:51:12,805 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:12,806 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:12,808 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:12,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:12,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-03 20:51:12,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:12,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:12,857 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:12,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:12,858 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:12,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:13,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:13,019 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:51:13,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-03 20:51:13,020 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:51:13,028 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 20:51:13,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 20:51:13,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:51:13,054 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-09-03 20:51:13,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:13,095 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-03 20:51:13,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 20:51:13,098 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-03 20:51:13,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:13,114 INFO L225 Difference]: With dead ends: 18 [2019-09-03 20:51:13,115 INFO L226 Difference]: Without dead ends: 12 [2019-09-03 20:51:13,116 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 20:51:13,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-03 20:51:13,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-03 20:51:13,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-03 20:51:13,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-03 20:51:13,145 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-03 20:51:13,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:13,145 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-03 20:51:13,145 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 20:51:13,145 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-03 20:51:13,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 20:51:13,146 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:13,146 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:13,147 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:13,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:13,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-03 20:51:13,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:13,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:13,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:13,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:13,149 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:13,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:13,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:13,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:13,259 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:13,260 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-03 20:51:13,261 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-03 20:51:13,289 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 20:51:13,289 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 20:51:13,340 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-03 20:51:13,629 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 20:51:13,633 INFO L272 AbstractInterpreter]: Visited 11 different actions 47 times. Merged at 2 different actions 12 times. Widened at 1 different actions 4 times. Performed 89 root evaluator evaluations with a maximum evaluation depth of 12. Performed 89 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-03 20:51:13,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:13,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 20:51:13,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:13,640 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) [2019-09-03 20:51:13,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:13,666 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 [2019-09-03 20:51:13,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:13,684 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-03 20:51:13,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:13,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:13,736 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:13,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:13,780 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:13,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-09-03 20:51:13,780 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:13,782 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 20:51:13,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 20:51:13,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-09-03 20:51:13,783 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2019-09-03 20:51:13,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:13,813 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-03 20:51:13,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-03 20:51:13,815 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-09-03 20:51:13,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:13,816 INFO L225 Difference]: With dead ends: 13 [2019-09-03 20:51:13,816 INFO L226 Difference]: Without dead ends: 13 [2019-09-03 20:51:13,818 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-09-03 20:51:13,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-03 20:51:13,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-03 20:51:13,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-03 20:51:13,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-03 20:51:13,823 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-03 20:51:13,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:13,824 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-03 20:51:13,824 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 20:51:13,825 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-03 20:51:13,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-03 20:51:13,825 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:13,826 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:13,826 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:13,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:13,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-03 20:51:13,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:13,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:13,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:13,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:13,832 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:13,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:13,965 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:13,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:13,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:13,966 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:13,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:13,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:13,966 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) [2019-09-03 20:51:13,991 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:51:13,991 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 [2019-09-03 20:51:14,004 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-03 20:51:14,004 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:14,005 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-03 20:51:14,006 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:14,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,039 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:14,109 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:14,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2019-09-03 20:51:14,115 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:14,115 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 20:51:14,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 20:51:14,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-09-03 20:51:14,116 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-03 20:51:14,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:14,142 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-03 20:51:14,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 20:51:14,143 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2019-09-03 20:51:14,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:14,144 INFO L225 Difference]: With dead ends: 14 [2019-09-03 20:51:14,144 INFO L226 Difference]: Without dead ends: 14 [2019-09-03 20:51:14,145 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-09-03 20:51:14,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-03 20:51:14,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-03 20:51:14,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 20:51:14,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-03 20:51:14,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-03 20:51:14,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:14,148 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-03 20:51:14,148 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 20:51:14,149 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-03 20:51:14,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 20:51:14,149 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:14,149 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:14,150 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:14,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:14,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-03 20:51:14,150 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:14,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,152 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:51:14,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,152 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:14,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:14,299 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:14,299 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:14,300 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:14,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:14,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:14,300 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 [2019-09-03 20:51:14,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:51:14,332 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:51:14,351 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:51:14,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:14,352 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-03 20:51:14,353 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:14,389 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,390 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:14,487 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:14,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2019-09-03 20:51:14,492 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:14,493 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-03 20:51:14,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-03 20:51:14,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-09-03 20:51:14,493 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2019-09-03 20:51:14,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:14,550 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-03 20:51:14,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:51:14,552 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2019-09-03 20:51:14,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:14,552 INFO L225 Difference]: With dead ends: 15 [2019-09-03 20:51:14,553 INFO L226 Difference]: Without dead ends: 15 [2019-09-03 20:51:14,553 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-09-03 20:51:14,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-03 20:51:14,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-03 20:51:14,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 20:51:14,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-03 20:51:14,558 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-03 20:51:14,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:14,558 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-03 20:51:14,558 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-03 20:51:14,559 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-03 20:51:14,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 20:51:14,560 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:14,560 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:14,560 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:14,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:14,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-03 20:51:14,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:14,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,564 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:51:14,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,565 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:14,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:14,718 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:14,719 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:14,719 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:14,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:14,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:14,719 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) [2019-09-03 20:51:14,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:14,734 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 [2019-09-03 20:51:14,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:14,754 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 20:51:14,755 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:14,785 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:14,785 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (5)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:51:14,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:14,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2019-09-03 20:51:14,879 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:14,880 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-03 20:51:14,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-03 20:51:14,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-09-03 20:51:14,880 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2019-09-03 20:51:14,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:14,935 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-03 20:51:14,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 20:51:14,937 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-09-03 20:51:14,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:14,938 INFO L225 Difference]: With dead ends: 16 [2019-09-03 20:51:14,938 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 20:51:14,938 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-09-03 20:51:14,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 20:51:14,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-03 20:51:14,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-03 20:51:14,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-03 20:51:14,946 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-03 20:51:14,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:14,947 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-03 20:51:14,947 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-03 20:51:14,947 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-03 20:51:14,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-03 20:51:14,948 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:14,948 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:14,948 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:14,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:14,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-03 20:51:14,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:14,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:51:14,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:14,951 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:14,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:15,087 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:15,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:15,088 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:15,088 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:15,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:15,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:15,089 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) [2019-09-03 20:51:15,111 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:51:15,112 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:51:15,133 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-03 20:51:15,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:15,134 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 20:51:15,136 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:15,164 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:15,164 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:51:15,279 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:15,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:51:15,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-03 20:51:15,285 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:51:15,285 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-03 20:51:15,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-03 20:51:15,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:51:15,286 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 9 states. [2019-09-03 20:51:15,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:51:15,349 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-03 20:51:15,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 20:51:15,350 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-09-03 20:51:15,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:51:15,351 INFO L225 Difference]: With dead ends: 17 [2019-09-03 20:51:15,351 INFO L226 Difference]: Without dead ends: 17 [2019-09-03 20:51:15,352 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:51:15,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-03 20:51:15,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-03 20:51:15,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-03 20:51:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-03 20:51:15,357 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-03 20:51:15,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:51:15,357 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-03 20:51:15,357 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-03 20:51:15,357 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-03 20:51:15,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 20:51:15,358 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:51:15,358 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:51:15,359 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:51:15,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:51:15,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-03 20:51:15,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:51:15,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:15,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:51:15,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:51:15,362 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:51:15,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:51:21,581 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 18 [2019-09-03 20:51:21,621 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 19 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:21,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:21,622 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:51:21,622 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:51:21,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:51:21,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:51:21,622 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:51:21,642 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:51:21,642 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:51:21,664 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:51:21,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:51:21,666 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 20 conjunts are in the unsatisfiable core [2019-09-03 20:51:21,667 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:51:45,652 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:45,654 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:45,661 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:45,663 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:45,667 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 20:51:47,553 WARN L188 SmtUtils]: Spent 620.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 38 [2019-09-03 20:51:48,443 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:51:48,443 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:52:22,650 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 19 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:52:22,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:52:22,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2019-09-03 20:52:22,654 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:52:22,655 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 20:52:22,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 20:52:22,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=457, Unknown=20, NotChecked=0, Total=600 [2019-09-03 20:52:22,656 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 19 states. [2019-09-03 20:52:23,559 WARN L188 SmtUtils]: Spent 574.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2019-09-03 20:52:25,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:52:25,630 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2019-09-03 20:52:25,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-03 20:52:25,630 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 16 [2019-09-03 20:52:25,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:52:25,631 INFO L225 Difference]: With dead ends: 25 [2019-09-03 20:52:25,631 INFO L226 Difference]: Without dead ends: 19 [2019-09-03 20:52:25,632 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 67.7s TimeCoverageRelationStatistics Valid=134, Invalid=548, Unknown=20, NotChecked=0, Total=702 [2019-09-03 20:52:25,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-03 20:52:25,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-09-03 20:52:25,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-03 20:52:25,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-09-03 20:52:25,637 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-09-03 20:52:25,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:52:25,637 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-09-03 20:52:25,637 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 20:52:25,637 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-09-03 20:52:25,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-03 20:52:25,638 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:52:25,638 INFO L399 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:52:25,638 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:52:25,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:52:25,639 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 7 times [2019-09-03 20:52:25,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:52:25,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:25,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:52:25,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:52:25,641 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:52:25,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:25,755 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-03 20:52:25,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:52:25,755 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:52:25,755 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:52:25,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:52:25,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:52:25,756 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:52:25,777 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:52:25,777 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:52:25,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:52:25,792 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 20:52:25,801 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:52:25,835 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-03 20:52:25,835 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:52:26,113 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-03 20:52:26,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:52:26,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2019-09-03 20:52:26,118 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:52:26,119 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 20:52:26,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 20:52:26,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2019-09-03 20:52:26,119 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2019-09-03 20:52:26,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:52:26,162 INFO L93 Difference]: Finished difference Result 12 states and 11 transitions. [2019-09-03 20:52:26,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 20:52:26,163 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-09-03 20:52:26,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:52:26,163 INFO L225 Difference]: With dead ends: 12 [2019-09-03 20:52:26,164 INFO L226 Difference]: Without dead ends: 0 [2019-09-03 20:52:26,164 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2019-09-03 20:52:26,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-03 20:52:26,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-03 20:52:26,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-03 20:52:26,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-03 20:52:26,165 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2019-09-03 20:52:26,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:52:26,165 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-03 20:52:26,165 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 20:52:26,166 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-03 20:52:26,166 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-03 20:52:26,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.09 08:52:26 BoogieIcfgContainer [2019-09-03 20:52:26,171 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-03 20:52:26,173 INFO L168 Benchmark]: Toolchain (without parser) took 74047.31 ms. Allocated memory was 137.9 MB in the beginning and 264.2 MB in the end (delta: 126.4 MB). Free memory was 86.5 MB in the beginning and 206.3 MB in the end (delta: -119.8 MB). Peak memory consumption was 6.6 MB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,174 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 105.2 MB in the beginning and 105.0 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,175 INFO L168 Benchmark]: CACSL2BoogieTranslator took 253.09 ms. Allocated memory is still 137.9 MB. Free memory was 86.1 MB in the beginning and 76.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,176 INFO L168 Benchmark]: Boogie Preprocessor took 126.59 ms. Allocated memory was 137.9 MB in the beginning and 198.7 MB in the end (delta: 60.8 MB). Free memory was 76.7 MB in the beginning and 176.3 MB in the end (delta: -99.6 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,176 INFO L168 Benchmark]: RCFGBuilder took 216.66 ms. Allocated memory is still 198.7 MB. Free memory was 176.3 MB in the beginning and 165.4 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,177 INFO L168 Benchmark]: TraceAbstraction took 73446.69 ms. Allocated memory was 198.7 MB in the beginning and 264.2 MB in the end (delta: 65.5 MB). Free memory was 165.4 MB in the beginning and 206.3 MB in the end (delta: -40.9 MB). Peak memory consumption was 24.6 MB. Max. memory is 7.1 GB. [2019-09-03 20:52:26,181 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 105.2 MB in the beginning and 105.0 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 253.09 ms. Allocated memory is still 137.9 MB. Free memory was 86.1 MB in the beginning and 76.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 126.59 ms. Allocated memory was 137.9 MB in the beginning and 198.7 MB in the end (delta: 60.8 MB). Free memory was 76.7 MB in the beginning and 176.3 MB in the end (delta: -99.6 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 216.66 ms. Allocated memory is still 198.7 MB. Free memory was 176.3 MB in the beginning and 165.4 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 73446.69 ms. Allocated memory was 198.7 MB in the beginning and 264.2 MB in the end (delta: 65.5 MB). Free memory was 165.4 MB in the beginning and 206.3 MB in the end (delta: -40.9 MB). Peak memory consumption was 24.6 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, 73.3s OverallTime, 8 OverallIterations, 8 TraceHistogramMax, 3.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 80 SDtfs, 3 SDslu, 287 SDs, 0 SdLazy, 290 SolverSat, 22 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 246 GetRequests, 152 SyntacticMatches, 8 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 68.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 68.8s InterpolantComputationTime, 208 NumberOfCodeBlocks, 208 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 285 ConstructedInterpolants, 2 QuantifiedInterpolants, 29274 SizeOfPredicates, 7 NumberOfNonLiveVariables, 313 ConjunctsInSsa, 80 ConjunctsInUnsatCore, 22 InterpolantComputations, 1 PerfectInterpolantSequences, 45/276 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...