/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -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/Problem10_label21.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:42:09,027 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:42:09,029 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:42:09,048 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 22:42:09,049 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 22:42:09,051 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 22:42:09,053 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 22:42:09,062 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 22:42:09,066 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 22:42:09,070 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 22:42:09,071 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 22:42:09,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 22:42:09,073 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:42:09,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:42:09,076 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:42:09,078 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:42:09,079 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:42:09,081 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:42:09,083 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:42:09,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:42:09,091 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:42:09,094 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:42:09,097 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:42:09,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:42:09,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-06 22:42:09,100 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-06 22:42:09,100 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-06 22:42:09,102 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-06 22:42:09,102 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-06 22:42:09,104 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-06 22:42:09,104 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 22:42:09,105 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 22:42:09,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 22:42:09,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 22:42:09,108 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 22:42:09,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 22:42:09,109 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 22:42:09,109 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 22:42:09,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:42:09,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:42:09,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:42:09,111 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 [2019-11-06 22:42:09,136 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:42:09,136 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:42:09,137 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:42:09,137 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:42:09,138 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:42:09,138 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:42:09,138 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:42:09,138 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:42:09,138 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:42:09,139 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:42:09,139 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:42:09,139 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:42:09,139 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:42:09,139 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:42:09,140 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:42:09,140 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:42:09,140 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:42:09,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:42:09,140 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:42:09,141 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:42:09,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:42:09,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:42:09,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:42:09,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:42:09,141 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:42:09,142 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:42:09,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:42:09,142 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:42:09,142 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 [2019-11-06 22:42:09,413 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:42:09,432 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:42:09,436 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:42:09,438 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:42:09,438 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:42:09,439 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label21.c [2019-11-06 22:42:09,517 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/287d9b66c/640b7f1a0fb34b7099187e6c6d09cd1f/FLAG20ef453f6 [2019-11-06 22:42:10,097 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:42:10,097 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label21.c [2019-11-06 22:42:10,119 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/287d9b66c/640b7f1a0fb34b7099187e6c6d09cd1f/FLAG20ef453f6 [2019-11-06 22:42:10,343 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/287d9b66c/640b7f1a0fb34b7099187e6c6d09cd1f [2019-11-06 22:42:10,351 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:42:10,352 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:42:10,353 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:42:10,353 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:42:10,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:42:10,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:42:10" (1/1) ... [2019-11-06 22:42:10,361 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ef12673 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:10, skipping insertion in model container [2019-11-06 22:42:10,361 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:42:10" (1/1) ... [2019-11-06 22:42:10,369 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:42:10,424 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:42:10,956 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:42:10,965 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:42:11,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:42:11,166 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:42:11,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11 WrapperNode [2019-11-06 22:42:11,167 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:42:11,168 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:42:11,168 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:42:11,168 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:42:11,185 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,186 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,250 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,271 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,277 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (1/1) ... [2019-11-06 22:42:11,293 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:42:11,294 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:42:11,294 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:42:11,294 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:42:11,295 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (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 [2019-11-06 22:42:11,368 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:42:11,368 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:42:11,368 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:42:11,369 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:42:11,369 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:42:11,369 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:42:11,369 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:42:11,370 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:42:11,370 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:42:11,371 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:42:11,371 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:42:12,693 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:42:12,694 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:42:12,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:42:12 BoogieIcfgContainer [2019-11-06 22:42:12,695 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:42:12,696 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:42:12,697 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:42:12,699 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:42:12,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:42:10" (1/3) ... [2019-11-06 22:42:12,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73c6d537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:42:12, skipping insertion in model container [2019-11-06 22:42:12,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:11" (2/3) ... [2019-11-06 22:42:12,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73c6d537 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:42:12, skipping insertion in model container [2019-11-06 22:42:12,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:42:12" (3/3) ... [2019-11-06 22:42:12,703 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label21.c [2019-11-06 22:42:12,713 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:42:12,722 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:42:12,733 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:42:12,760 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:42:12,761 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:42:12,761 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:42:12,761 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:42:12,763 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:42:12,763 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:42:12,763 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:42:12,763 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:42:12,797 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2019-11-06 22:42:12,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-06 22:42:12,805 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:12,806 INFO L410 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] [2019-11-06 22:42:12,808 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:12,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:12,813 INFO L82 PathProgramCache]: Analyzing trace with hash -689743650, now seen corresponding path program 1 times [2019-11-06 22:42:12,821 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:12,821 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472907303] [2019-11-06 22:42:12,821 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:12,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:13,111 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472907303] [2019-11-06 22:42:13,112 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:13,112 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:42:13,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495775494] [2019-11-06 22:42:13,120 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:42:13,121 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:13,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:42:13,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:42:13,139 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 3 states. [2019-11-06 22:42:14,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:14,246 INFO L93 Difference]: Finished difference Result 571 states and 989 transitions. [2019-11-06 22:42:14,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:42:14,252 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 33 [2019-11-06 22:42:14,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:14,285 INFO L225 Difference]: With dead ends: 571 [2019-11-06 22:42:14,285 INFO L226 Difference]: Without dead ends: 294 [2019-11-06 22:42:14,299 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:42:14,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2019-11-06 22:42:14,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 294. [2019-11-06 22:42:14,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2019-11-06 22:42:14,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 446 transitions. [2019-11-06 22:42:14,421 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 446 transitions. Word has length 33 [2019-11-06 22:42:14,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:14,422 INFO L462 AbstractCegarLoop]: Abstraction has 294 states and 446 transitions. [2019-11-06 22:42:14,423 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:42:14,423 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 446 transitions. [2019-11-06 22:42:14,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-11-06 22:42:14,431 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:14,432 INFO L410 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, 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, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:42:14,432 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:14,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:14,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1458033486, now seen corresponding path program 1 times [2019-11-06 22:42:14,434 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:14,434 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16146440] [2019-11-06 22:42:14,435 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:14,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:14,693 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:14,694 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16146440] [2019-11-06 22:42:14,694 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:14,694 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:42:14,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446028934] [2019-11-06 22:42:14,696 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:42:14,697 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:14,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:42:14,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:42:14,698 INFO L87 Difference]: Start difference. First operand 294 states and 446 transitions. Second operand 5 states. [2019-11-06 22:42:15,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:15,629 INFO L93 Difference]: Finished difference Result 888 states and 1367 transitions. [2019-11-06 22:42:15,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 22:42:15,630 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 115 [2019-11-06 22:42:15,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:15,634 INFO L225 Difference]: With dead ends: 888 [2019-11-06 22:42:15,634 INFO L226 Difference]: Without dead ends: 600 [2019-11-06 22:42:15,635 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:42:15,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2019-11-06 22:42:15,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 447. [2019-11-06 22:42:15,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 447 states. [2019-11-06 22:42:15,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 661 transitions. [2019-11-06 22:42:15,688 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 661 transitions. Word has length 115 [2019-11-06 22:42:15,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:15,691 INFO L462 AbstractCegarLoop]: Abstraction has 447 states and 661 transitions. [2019-11-06 22:42:15,691 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:42:15,691 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 661 transitions. [2019-11-06 22:42:15,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-11-06 22:42:15,705 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:15,705 INFO L410 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:42:15,705 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:15,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:15,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1013478446, now seen corresponding path program 1 times [2019-11-06 22:42:15,706 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:15,706 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873979167] [2019-11-06 22:42:15,706 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:15,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:15,956 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:15,957 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873979167] [2019-11-06 22:42:15,957 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:15,957 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:42:15,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108786677] [2019-11-06 22:42:15,958 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:42:15,958 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:15,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:42:15,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:42:15,959 INFO L87 Difference]: Start difference. First operand 447 states and 661 transitions. Second operand 6 states. [2019-11-06 22:42:16,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:16,957 INFO L93 Difference]: Finished difference Result 1200 states and 1824 transitions. [2019-11-06 22:42:16,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:42:16,958 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 131 [2019-11-06 22:42:16,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:16,964 INFO L225 Difference]: With dead ends: 1200 [2019-11-06 22:42:16,965 INFO L226 Difference]: Without dead ends: 759 [2019-11-06 22:42:16,967 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-11-06 22:42:16,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 759 states. [2019-11-06 22:42:16,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 759 to 745. [2019-11-06 22:42:16,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 745 states. [2019-11-06 22:42:16,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 745 states to 745 states and 1096 transitions. [2019-11-06 22:42:16,998 INFO L78 Accepts]: Start accepts. Automaton has 745 states and 1096 transitions. Word has length 131 [2019-11-06 22:42:16,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:16,998 INFO L462 AbstractCegarLoop]: Abstraction has 745 states and 1096 transitions. [2019-11-06 22:42:16,998 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:42:16,999 INFO L276 IsEmpty]: Start isEmpty. Operand 745 states and 1096 transitions. [2019-11-06 22:42:17,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-11-06 22:42:17,002 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:17,002 INFO L410 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, 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, 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] [2019-11-06 22:42:17,002 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:17,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:17,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1627642498, now seen corresponding path program 1 times [2019-11-06 22:42:17,003 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:17,004 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945974836] [2019-11-06 22:42:17,004 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:17,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:17,184 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:17,185 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945974836] [2019-11-06 22:42:17,185 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:17,185 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:42:17,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203702935] [2019-11-06 22:42:17,186 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:42:17,186 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:17,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:42:17,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:42:17,187 INFO L87 Difference]: Start difference. First operand 745 states and 1096 transitions. Second operand 6 states. [2019-11-06 22:42:18,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:18,086 INFO L93 Difference]: Finished difference Result 1814 states and 2766 transitions. [2019-11-06 22:42:18,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:42:18,087 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 155 [2019-11-06 22:42:18,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:18,096 INFO L225 Difference]: With dead ends: 1814 [2019-11-06 22:42:18,096 INFO L226 Difference]: Without dead ends: 1075 [2019-11-06 22:42:18,098 INFO L630 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 [2019-11-06 22:42:18,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1075 states. [2019-11-06 22:42:18,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1075 to 1047. [2019-11-06 22:42:18,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1047 states. [2019-11-06 22:42:18,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 1430 transitions. [2019-11-06 22:42:18,135 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 1430 transitions. Word has length 155 [2019-11-06 22:42:18,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:18,136 INFO L462 AbstractCegarLoop]: Abstraction has 1047 states and 1430 transitions. [2019-11-06 22:42:18,136 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:42:18,136 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 1430 transitions. [2019-11-06 22:42:18,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2019-11-06 22:42:18,139 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:18,140 INFO L410 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, 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, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:42:18,140 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:18,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:18,141 INFO L82 PathProgramCache]: Analyzing trace with hash 418106165, now seen corresponding path program 1 times [2019-11-06 22:42:18,141 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:18,141 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732386319] [2019-11-06 22:42:18,141 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:18,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:18,571 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:18,572 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732386319] [2019-11-06 22:42:18,572 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65554198] [2019-11-06 22:42:18,572 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 [2019-11-06 22:42:18,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:18,665 INFO L256 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:42:18,679 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:42:18,783 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:18,783 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:42:18,959 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:18,959 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [744649711] [2019-11-06 22:42:18,968 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 195 [2019-11-06 22:42:19,030 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:42:19,031 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-06 22:42:30,857 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-11-06 22:42:47,721 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-11-06 22:42:47,724 INFO L272 AbstractInterpreter]: Visited 90 different actions 173 times. Merged at 3 different actions 3 times. Never widened. Performed 307 root evaluator evaluations with a maximum evaluation depth of 16. Performed 307 inverse root evaluator evaluations with a maximum inverse evaluation depth of 16. Found 1 fixpoints after 1 different actions. Largest state had 24 variables. [2019-11-06 22:42:47,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:47,728 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates