/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/Problem16_label21.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:54:33,144 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:54:33,146 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:54:33,158 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:54:33,169 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:54:33,170 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:54:33,174 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:54:33,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:54:33,184 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:54:33,185 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:54:33,189 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:54:33,191 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:54:33,192 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:54:33,196 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:54:33,197 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:54:33,199 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:54:33,203 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:54:33,212 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:54:33,213 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:54:33,214 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:54:33,215 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 22:54:33,228 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:54:33,229 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:54:33,230 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:54:33,230 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:54:33,230 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:54:33,231 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:54:33,231 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:54:33,231 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:54:33,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:54:33,231 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:54:33,232 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:54:33,232 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:54:33,232 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:54:33,232 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:54:33,232 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:54:33,233 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:54:33,233 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:54:33,233 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:54:33,233 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:54:33,234 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:54:33,234 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:54:33,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:54:33,234 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:54:33,235 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:54:33,235 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:54:33,235 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:54:33,235 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:54:33,235 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:54:33,236 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 22:54:33,560 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:54:33,580 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:54:33,584 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:54:33,586 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:54:33,586 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:54:33,587 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label21.c [2019-11-06 22:54:33,655 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/481a9996a/fb48e7bd21c54ce9aa791c63905a0214/FLAGbcc79e44a [2019-11-06 22:54:34,258 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:54:34,259 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label21.c [2019-11-06 22:54:34,274 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/481a9996a/fb48e7bd21c54ce9aa791c63905a0214/FLAGbcc79e44a [2019-11-06 22:54:34,451 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/481a9996a/fb48e7bd21c54ce9aa791c63905a0214 [2019-11-06 22:54:34,461 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:54:34,463 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:54:34,464 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:54:34,464 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:54:34,468 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:54:34,468 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:54:34" (1/1) ... [2019-11-06 22:54:34,471 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58706db1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:34, skipping insertion in model container [2019-11-06 22:54:34,471 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:54:34" (1/1) ... [2019-11-06 22:54:34,479 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:54:34,555 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:54:35,505 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:54:35,509 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:54:35,760 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:54:35,780 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:54:35,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35 WrapperNode [2019-11-06 22:54:35,781 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:54:35,782 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:54:35,782 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:54:35,782 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:54:35,797 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,861 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,861 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,941 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,984 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... [2019-11-06 22:54:35,995 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:54:35,996 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:54:35,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:54:35,996 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:54:35,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:54:36,062 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:54:36,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:54:36,063 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:54:36,063 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-06 22:54:36,064 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:54:36,064 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:54:36,065 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-06 22:54:36,065 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:54:36,065 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:54:36,066 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:54:36,066 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:54:36,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:54:36,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:54:38,411 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:54:38,411 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:54:38,416 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:54:38 BoogieIcfgContainer [2019-11-06 22:54:38,416 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:54:38,417 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:54:38,418 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:54:38,421 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:54:38,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:54:34" (1/3) ... [2019-11-06 22:54:38,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e60b0ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:54:38, skipping insertion in model container [2019-11-06 22:54:38,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:54:35" (2/3) ... [2019-11-06 22:54:38,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e60b0ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:54:38, skipping insertion in model container [2019-11-06 22:54:38,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:54:38" (3/3) ... [2019-11-06 22:54:38,431 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem16_label21.c [2019-11-06 22:54:38,442 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:54:38,453 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:54:38,464 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:54:38,497 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:54:38,497 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:54:38,497 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:54:38,498 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:54:38,498 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:54:38,498 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:54:38,498 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:54:38,498 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:54:38,526 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states. [2019-11-06 22:54:38,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 22:54:38,533 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:54:38,534 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:54:38,536 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:54:38,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:38,542 INFO L82 PathProgramCache]: Analyzing trace with hash -782110827, now seen corresponding path program 1 times [2019-11-06 22:54:38,551 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:54:38,552 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484585510] [2019-11-06 22:54:38,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:54:38,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:38,827 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 22:54:38,828 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484585510] [2019-11-06 22:54:38,828 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:54:38,829 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:54:38,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123632731] [2019-11-06 22:54:38,835 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:54:38,836 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:54:38,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:54:38,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:54:38,854 INFO L87 Difference]: Start difference. First operand 409 states. Second operand 3 states. [2019-11-06 22:54:41,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:54:41,094 INFO L93 Difference]: Finished difference Result 1153 states and 2141 transitions. [2019-11-06 22:54:41,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:54:41,096 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 44 [2019-11-06 22:54:41,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:54:41,117 INFO L225 Difference]: With dead ends: 1153 [2019-11-06 22:54:41,117 INFO L226 Difference]: Without dead ends: 682 [2019-11-06 22:54:41,128 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 22:54:41,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2019-11-06 22:54:41,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 682. [2019-11-06 22:54:41,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2019-11-06 22:54:41,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 1166 transitions. [2019-11-06 22:54:41,224 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 1166 transitions. Word has length 44 [2019-11-06 22:54:41,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:54:41,225 INFO L462 AbstractCegarLoop]: Abstraction has 682 states and 1166 transitions. [2019-11-06 22:54:41,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:54:41,225 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 1166 transitions. [2019-11-06 22:54:41,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2019-11-06 22:54:41,232 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:54:41,233 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, 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] [2019-11-06 22:54:41,233 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:54:41,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:41,234 INFO L82 PathProgramCache]: Analyzing trace with hash -652250435, now seen corresponding path program 1 times [2019-11-06 22:54:41,234 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:54:41,234 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936215565] [2019-11-06 22:54:41,235 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:54:41,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:41,592 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:54:41,593 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936215565] [2019-11-06 22:54:41,594 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:54:41,594 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:54:41,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733979820] [2019-11-06 22:54:41,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:54:41,597 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:54:41,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:54:41,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:54:41,598 INFO L87 Difference]: Start difference. First operand 682 states and 1166 transitions. Second operand 6 states. [2019-11-06 22:54:44,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:54:44,357 INFO L93 Difference]: Finished difference Result 1733 states and 2953 transitions. [2019-11-06 22:54:44,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:54:44,358 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 151 [2019-11-06 22:54:44,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:54:44,366 INFO L225 Difference]: With dead ends: 1733 [2019-11-06 22:54:44,366 INFO L226 Difference]: Without dead ends: 1057 [2019-11-06 22:54:44,368 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 22:54:44,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1057 states. [2019-11-06 22:54:44,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1057 to 1039. [2019-11-06 22:54:44,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1039 states. [2019-11-06 22:54:44,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1701 transitions. [2019-11-06 22:54:44,420 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1701 transitions. Word has length 151 [2019-11-06 22:54:44,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:54:44,421 INFO L462 AbstractCegarLoop]: Abstraction has 1039 states and 1701 transitions. [2019-11-06 22:54:44,421 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:54:44,421 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1701 transitions. [2019-11-06 22:54:44,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-11-06 22:54:44,424 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:54:44,424 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, 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] [2019-11-06 22:54:44,425 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:54:44,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:44,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1164656156, now seen corresponding path program 1 times [2019-11-06 22:54:44,425 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:54:44,426 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54318161] [2019-11-06 22:54:44,426 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:54:44,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:44,558 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:54:44,558 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54318161] [2019-11-06 22:54:44,559 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:54:44,559 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:54:44,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683539118] [2019-11-06 22:54:44,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:54:44,560 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:54:44,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:54:44,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:54:44,561 INFO L87 Difference]: Start difference. First operand 1039 states and 1701 transitions. Second operand 6 states. [2019-11-06 22:54:47,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:54:47,443 INFO L93 Difference]: Finished difference Result 3130 states and 5158 transitions. [2019-11-06 22:54:47,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:54:47,443 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 154 [2019-11-06 22:54:47,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:54:47,456 INFO L225 Difference]: With dead ends: 3130 [2019-11-06 22:54:47,457 INFO L226 Difference]: Without dead ends: 2097 [2019-11-06 22:54:47,460 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 22:54:47,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2097 states. [2019-11-06 22:54:47,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2097 to 2081. [2019-11-06 22:54:47,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2081 states. [2019-11-06 22:54:47,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2081 states to 2081 states and 3125 transitions. [2019-11-06 22:54:47,549 INFO L78 Accepts]: Start accepts. Automaton has 2081 states and 3125 transitions. Word has length 154 [2019-11-06 22:54:47,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:54:47,550 INFO L462 AbstractCegarLoop]: Abstraction has 2081 states and 3125 transitions. [2019-11-06 22:54:47,550 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:54:47,550 INFO L276 IsEmpty]: Start isEmpty. Operand 2081 states and 3125 transitions. [2019-11-06 22:54:47,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2019-11-06 22:54:47,557 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:54:47,557 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, 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, 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] [2019-11-06 22:54:47,557 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:54:47,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:47,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1027924604, now seen corresponding path program 1 times [2019-11-06 22:54:47,558 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:54:47,558 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87291661] [2019-11-06 22:54:47,558 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:54:47,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:47,769 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 74 proven. 106 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:54:47,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87291661] [2019-11-06 22:54:47,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524084198] [2019-11-06 22:54:47,770 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 22:54:47,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:47,886 INFO L256 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 22:54:47,899 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:54:48,068 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-11-06 22:54:48,068 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:54:48,237 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 74 proven. 106 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:54:48,238 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:54:48,238 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2019-11-06 22:54:48,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485691988] [2019-11-06 22:54:48,239 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:54:48,239 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:54:48,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:54:48,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-11-06 22:54:48,240 INFO L87 Difference]: Start difference. First operand 2081 states and 3125 transitions. Second operand 5 states. [2019-11-06 22:54:51,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:54:51,438 INFO L93 Difference]: Finished difference Result 6247 states and 9508 transitions. [2019-11-06 22:54:51,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:54:51,440 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 269 [2019-11-06 22:54:51,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:54:51,462 INFO L225 Difference]: With dead ends: 6247 [2019-11-06 22:54:51,462 INFO L226 Difference]: Without dead ends: 4172 [2019-11-06 22:54:51,468 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 533 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-06 22:54:51,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4172 states. [2019-11-06 22:54:51,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4172 to 4160. [2019-11-06 22:54:51,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4160 states. [2019-11-06 22:54:51,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4160 states to 4160 states and 5580 transitions. [2019-11-06 22:54:51,603 INFO L78 Accepts]: Start accepts. Automaton has 4160 states and 5580 transitions. Word has length 269 [2019-11-06 22:54:51,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:54:51,606 INFO L462 AbstractCegarLoop]: Abstraction has 4160 states and 5580 transitions. [2019-11-06 22:54:51,606 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:54:51,606 INFO L276 IsEmpty]: Start isEmpty. Operand 4160 states and 5580 transitions. [2019-11-06 22:54:51,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2019-11-06 22:54:51,618 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:54:51,619 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:54:51,825 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:54:51,825 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:54:51,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:51,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1787540889, now seen corresponding path program 1 times [2019-11-06 22:54:51,828 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:54:51,828 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881648860] [2019-11-06 22:54:51,828 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:54:51,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:52,122 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 116 proven. 235 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 22:54:52,122 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881648860] [2019-11-06 22:54:52,123 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47200367] [2019-11-06 22:54:52,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:54:52,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:54:52,300 INFO L256 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:54:52,307 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:54:52,431 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 381 proven. 2 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-11-06 22:54:52,431 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:54:52,677 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 213 proven. 110 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-06 22:54:52,678 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1904298818] [2019-11-06 22:54:52,685 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 370 [2019-11-06 22:54:52,751 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:54:52,752 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-06 22:54:59,970 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-11-06 22:54:59,972 INFO L272 AbstractInterpreter]: Visited 121 different actions 121 times. Never merged. Never widened. Performed 281 root evaluator evaluations with a maximum evaluation depth of 14. Performed 281 inverse root evaluator evaluations with a maximum inverse evaluation depth of 14. Never found a fixpoint. Largest state had 24 variables. [2019-11-06 22:54:59,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:54:59,976 INFO L536 sIntCurrentIteration]: Generating AbsInt predicates