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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem18_label56.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 00:10:43,411 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 00:10:43,414 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 00:10:43,434 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 00:10:43,434 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 00:10:43,436 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 00:10:43,438 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 00:10:43,451 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 00:10:43,453 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 00:10:43,455 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 00:10:43,456 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 00:10:43,458 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 00:10:43,459 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 00:10:43,462 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 00:10:43,465 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 00:10:43,467 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 00:10:43,468 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 00:10:43,471 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 00:10:43,473 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 00:10:43,479 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 00:10:43,483 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 00:10:43,484 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 00:10:43,486 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 00:10:43,486 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 00:10:43,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 00:10:43,501 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 00:10:43,503 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 00:10:43,506 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 00:10:43,507 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 00:10:43,526 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 00:10:43,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 00:10:43,529 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 00:10:43,529 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 00:10:43,529 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 00:10:43,529 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 00:10:43,530 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 00:10:43,530 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 00:10:43,530 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 00:10:43,530 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 00:10:43,531 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 00:10:43,532 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 00:10:43,532 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 00:10:43,532 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 00:10:43,532 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 00:10:43,533 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 00:10:43,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 00:10:43,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 00:10:43,533 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 00:10:43,533 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 00:10:43,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 00:10:43,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 00:10:43,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 00:10:43,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 00:10:43,534 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 00:10:43,535 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 00:10:43,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 00:10:43,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 00:10:43,535 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-15 00:10:43,815 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 00:10:43,828 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 00:10:43,832 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 00:10:43,833 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 00:10:43,834 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 00:10:43,835 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem18_label56.c [2019-10-15 00:10:43,904 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11fd854a8/67668d13f76d43488e4c87aee7b4da7d/FLAGada1b58c6 [2019-10-15 00:10:44,637 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 00:10:44,640 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem18_label56.c [2019-10-15 00:10:44,671 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11fd854a8/67668d13f76d43488e4c87aee7b4da7d/FLAGada1b58c6 [2019-10-15 00:10:44,698 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11fd854a8/67668d13f76d43488e4c87aee7b4da7d [2019-10-15 00:10:44,711 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 00:10:44,714 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 00:10:44,716 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 00:10:44,716 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 00:10:44,719 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 00:10:44,721 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:10:44" (1/1) ... [2019-10-15 00:10:44,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65f25ee7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:44, skipping insertion in model container [2019-10-15 00:10:44,724 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:10:44" (1/1) ... [2019-10-15 00:10:44,733 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 00:10:44,863 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 00:10:46,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 00:10:46,104 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 00:10:46,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 00:10:46,557 INFO L192 MainTranslator]: Completed translation [2019-10-15 00:10:46,558 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46 WrapperNode [2019-10-15 00:10:46,559 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 00:10:46,560 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 00:10:46,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 00:10:46,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 00:10:46,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,577 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,636 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,638 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,741 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,780 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,816 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (1/1) ... [2019-10-15 00:10:46,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 00:10:46,864 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 00:10:46,864 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 00:10:46,865 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 00:10:46,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (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 [2019-10-15 00:10:46,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 00:10:46,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 00:10:46,950 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 00:10:46,950 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 00:10:46,950 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-10-15 00:10:46,951 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 00:10:46,951 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 00:10:46,951 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 00:10:46,952 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-10-15 00:10:46,952 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 00:10:46,952 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 00:10:46,953 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 00:10:46,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 00:10:46,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 00:10:46,954 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 00:10:51,366 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 00:10:51,366 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 00:10:51,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:10:51 BoogieIcfgContainer [2019-10-15 00:10:51,368 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 00:10:51,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 00:10:51,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 00:10:51,374 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 00:10:51,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 12:10:44" (1/3) ... [2019-10-15 00:10:51,375 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e46266e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:10:51, skipping insertion in model container [2019-10-15 00:10:51,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:10:46" (2/3) ... [2019-10-15 00:10:51,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e46266e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:10:51, skipping insertion in model container [2019-10-15 00:10:51,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:10:51" (3/3) ... [2019-10-15 00:10:51,378 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem18_label56.c [2019-10-15 00:10:51,389 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 00:10:51,399 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 00:10:51,412 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 00:10:51,447 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 00:10:51,448 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 00:10:51,448 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 00:10:51,448 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 00:10:51,448 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 00:10:51,448 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 00:10:51,449 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 00:10:51,449 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 00:10:51,485 INFO L276 IsEmpty]: Start isEmpty. Operand 774 states. [2019-10-15 00:10:51,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-15 00:10:51,496 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:10:51,498 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:10:51,500 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:10:51,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:10:51,509 INFO L82 PathProgramCache]: Analyzing trace with hash -447969511, now seen corresponding path program 1 times [2019-10-15 00:10:51,520 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:10:51,521 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313629669] [2019-10-15 00:10:51,521 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:10:51,521 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:10:51,522 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:10:51,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:10:51,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:10:51,928 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313629669] [2019-10-15 00:10:51,930 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:10:51,930 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 00:10:51,931 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462111793] [2019-10-15 00:10:51,936 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 00:10:51,938 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:10:51,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 00:10:51,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 00:10:51,959 INFO L87 Difference]: Start difference. First operand 774 states. Second operand 4 states. [2019-10-15 00:10:59,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:10:59,327 INFO L93 Difference]: Finished difference Result 2970 states and 5743 transitions. [2019-10-15 00:10:59,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 00:10:59,331 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 54 [2019-10-15 00:10:59,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:10:59,366 INFO L225 Difference]: With dead ends: 2970 [2019-10-15 00:10:59,367 INFO L226 Difference]: Without dead ends: 2114 [2019-10-15 00:10:59,379 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 00:10:59,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2114 states. [2019-10-15 00:10:59,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2114 to 2114. [2019-10-15 00:10:59,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2114 states. [2019-10-15 00:10:59,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2114 states to 2114 states and 3476 transitions. [2019-10-15 00:10:59,534 INFO L78 Accepts]: Start accepts. Automaton has 2114 states and 3476 transitions. Word has length 54 [2019-10-15 00:10:59,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:10:59,535 INFO L462 AbstractCegarLoop]: Abstraction has 2114 states and 3476 transitions. [2019-10-15 00:10:59,535 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 00:10:59,535 INFO L276 IsEmpty]: Start isEmpty. Operand 2114 states and 3476 transitions. [2019-10-15 00:10:59,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-10-15 00:10:59,541 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:10:59,541 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:10:59,542 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:10:59,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:10:59,542 INFO L82 PathProgramCache]: Analyzing trace with hash -970247243, now seen corresponding path program 1 times [2019-10-15 00:10:59,542 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:10:59,543 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648680952] [2019-10-15 00:10:59,543 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:10:59,543 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:10:59,543 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:10:59,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:10:59,674 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:10:59,674 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648680952] [2019-10-15 00:10:59,675 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:10:59,675 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 00:10:59,675 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927163323] [2019-10-15 00:10:59,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 00:10:59,677 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:10:59,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 00:10:59,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 00:10:59,678 INFO L87 Difference]: Start difference. First operand 2114 states and 3476 transitions. Second operand 5 states. [2019-10-15 00:11:05,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:11:05,293 INFO L93 Difference]: Finished difference Result 6436 states and 10709 transitions. [2019-10-15 00:11:05,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 00:11:05,295 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 123 [2019-10-15 00:11:05,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:11:05,329 INFO L225 Difference]: With dead ends: 6436 [2019-10-15 00:11:05,329 INFO L226 Difference]: Without dead ends: 4328 [2019-10-15 00:11:05,336 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-15 00:11:05,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4328 states. [2019-10-15 00:11:05,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4328 to 4296. [2019-10-15 00:11:05,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4296 states. [2019-10-15 00:11:05,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4296 states to 4296 states and 6660 transitions. [2019-10-15 00:11:05,484 INFO L78 Accepts]: Start accepts. Automaton has 4296 states and 6660 transitions. Word has length 123 [2019-10-15 00:11:05,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:11:05,486 INFO L462 AbstractCegarLoop]: Abstraction has 4296 states and 6660 transitions. [2019-10-15 00:11:05,486 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 00:11:05,487 INFO L276 IsEmpty]: Start isEmpty. Operand 4296 states and 6660 transitions. [2019-10-15 00:11:05,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-10-15 00:11:05,500 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:11:05,501 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:11:05,501 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:11:05,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:11:05,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1136099392, now seen corresponding path program 1 times [2019-10-15 00:11:05,503 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:11:05,503 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128154] [2019-10-15 00:11:05,504 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:05,504 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:05,504 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:11:05,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:11:05,753 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:11:05,753 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128154] [2019-10-15 00:11:05,754 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:11:05,754 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 00:11:05,754 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620400308] [2019-10-15 00:11:05,755 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 00:11:05,755 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:11:05,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 00:11:05,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 00:11:05,756 INFO L87 Difference]: Start difference. First operand 4296 states and 6660 transitions. Second operand 6 states. [2019-10-15 00:11:10,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:11:10,539 INFO L93 Difference]: Finished difference Result 10829 states and 16791 transitions. [2019-10-15 00:11:10,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 00:11:10,540 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 150 [2019-10-15 00:11:10,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:11:10,575 INFO L225 Difference]: With dead ends: 10829 [2019-10-15 00:11:10,575 INFO L226 Difference]: Without dead ends: 6539 [2019-10-15 00:11:10,586 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-15 00:11:10,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6539 states. [2019-10-15 00:11:10,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6539 to 6505. [2019-10-15 00:11:10,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6505 states. [2019-10-15 00:11:10,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6505 states to 6505 states and 8565 transitions. [2019-10-15 00:11:10,734 INFO L78 Accepts]: Start accepts. Automaton has 6505 states and 8565 transitions. Word has length 150 [2019-10-15 00:11:10,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:11:10,735 INFO L462 AbstractCegarLoop]: Abstraction has 6505 states and 8565 transitions. [2019-10-15 00:11:10,736 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 00:11:10,736 INFO L276 IsEmpty]: Start isEmpty. Operand 6505 states and 8565 transitions. [2019-10-15 00:11:10,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2019-10-15 00:11:10,742 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:11:10,743 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:11:10,743 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:11:10,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:11:10,743 INFO L82 PathProgramCache]: Analyzing trace with hash 874519778, now seen corresponding path program 1 times [2019-10-15 00:11:10,744 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:11:10,744 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742099127] [2019-10-15 00:11:10,744 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:10,744 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:10,744 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:11:10,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:11:10,984 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-15 00:11:10,985 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742099127] [2019-10-15 00:11:10,985 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 00:11:10,985 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 00:11:10,985 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32412660] [2019-10-15 00:11:10,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 00:11:10,986 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 00:11:10,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 00:11:10,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 00:11:10,987 INFO L87 Difference]: Start difference. First operand 6505 states and 8565 transitions. Second operand 4 states. [2019-10-15 00:11:17,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 00:11:17,499 INFO L93 Difference]: Finished difference Result 25846 states and 35185 transitions. [2019-10-15 00:11:17,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 00:11:17,499 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 229 [2019-10-15 00:11:17,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 00:11:17,569 INFO L225 Difference]: With dead ends: 25846 [2019-10-15 00:11:17,570 INFO L226 Difference]: Without dead ends: 19347 [2019-10-15 00:11:17,595 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 00:11:17,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19347 states. [2019-10-15 00:11:17,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19347 to 19347. [2019-10-15 00:11:17,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19347 states. [2019-10-15 00:11:18,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19347 states to 19347 states and 25089 transitions. [2019-10-15 00:11:18,030 INFO L78 Accepts]: Start accepts. Automaton has 19347 states and 25089 transitions. Word has length 229 [2019-10-15 00:11:18,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 00:11:18,032 INFO L462 AbstractCegarLoop]: Abstraction has 19347 states and 25089 transitions. [2019-10-15 00:11:18,033 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 00:11:18,033 INFO L276 IsEmpty]: Start isEmpty. Operand 19347 states and 25089 transitions. [2019-10-15 00:11:18,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2019-10-15 00:11:18,038 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 00:11:18,039 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 00:11:18,039 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 00:11:18,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 00:11:18,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1804576933, now seen corresponding path program 1 times [2019-10-15 00:11:18,040 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 00:11:18,040 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967129074] [2019-10-15 00:11:18,041 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:18,041 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 00:11:18,041 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 00:11:18,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:11:18,399 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 168 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:11:18,401 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967129074] [2019-10-15 00:11:18,402 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407659524] [2019-10-15 00:11:18,402 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 00:11:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 00:11:18,516 INFO L256 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 00:11:18,530 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 00:11:18,659 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 168 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:11:18,659 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 00:11:18,860 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 168 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 00:11:18,861 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1015353395] [2019-10-15 00:11:18,867 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 237 [2019-10-15 00:11:18,936 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 00:11:18,936 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)