/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/Problem11_label13.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:45:35,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:45:35,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:45:35,114 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:45:35,139 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:45:35,141 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:45:35,142 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:45:35,144 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:45:35,146 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:45:35,147 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:45:35,148 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:45:35,153 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:45:35,157 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:45:35,158 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:45:35,159 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:45:35,160 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:45:35,162 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:45:35,172 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:45:35,172 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:45:35,173 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:45:35,174 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 22:45:35,204 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:45:35,212 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:45:35,213 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:45:35,214 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:45:35,214 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:45:35,214 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:45:35,214 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:45:35,214 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:45:35,214 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:45:35,218 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:45:35,218 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:45:35,218 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:45:35,218 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:45:35,219 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:45:35,219 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:45:35,219 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:45:35,219 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:45:35,219 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:45:35,220 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:45:35,220 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:45:35,220 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:45:35,220 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:45:35,220 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:45:35,221 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:45:35,221 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:45:35,221 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:45:35,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:45:35,221 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:45:35,222 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 22:45:35,526 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:45:35,551 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:45:35,554 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:45:35,556 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:45:35,556 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:45:35,557 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem11_label13.c [2019-11-06 22:45:35,626 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3106feb82/46f823ce1281433d8d7ef477f6c6969e/FLAGc1f98101d [2019-11-06 22:45:36,273 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:45:36,273 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem11_label13.c [2019-11-06 22:45:36,289 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3106feb82/46f823ce1281433d8d7ef477f6c6969e/FLAGc1f98101d [2019-11-06 22:45:36,439 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3106feb82/46f823ce1281433d8d7ef477f6c6969e [2019-11-06 22:45:36,447 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:45:36,449 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:45:36,450 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:45:36,450 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:45:36,453 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:45:36,454 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:36" (1/1) ... [2019-11-06 22:45:36,457 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7da7326 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:36, skipping insertion in model container [2019-11-06 22:45:36,457 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:36" (1/1) ... [2019-11-06 22:45:36,465 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:45:36,532 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:45:37,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:45:37,206 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:45:37,362 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:45:37,382 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:45:37,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37 WrapperNode [2019-11-06 22:45:37,383 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:45:37,384 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:45:37,384 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:45:37,384 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:45:37,399 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,435 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,438 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,506 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,533 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,542 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (1/1) ... [2019-11-06 22:45:37,550 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:45:37,551 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:45:37,551 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:45:37,552 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:45:37,553 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (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 22:45:37,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:45:37,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:45:37,636 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:45:37,637 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:45:37,637 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:45:37,637 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:45:37,637 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:45:37,637 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:45:37,638 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:45:37,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:45:37,638 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:45:39,370 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:45:39,370 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:45:39,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:39 BoogieIcfgContainer [2019-11-06 22:45:39,372 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:45:39,373 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:45:39,373 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:45:39,377 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:45:39,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:45:36" (1/3) ... [2019-11-06 22:45:39,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c5219e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:39, skipping insertion in model container [2019-11-06 22:45:39,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:37" (2/3) ... [2019-11-06 22:45:39,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c5219e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:39, skipping insertion in model container [2019-11-06 22:45:39,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:39" (3/3) ... [2019-11-06 22:45:39,381 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem11_label13.c [2019-11-06 22:45:39,392 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:45:39,401 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:45:39,413 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:45:39,444 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:45:39,444 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:45:39,444 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:45:39,444 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:45:39,445 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:45:39,445 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:45:39,445 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:45:39,445 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:45:39,472 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states. [2019-11-06 22:45:39,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 22:45:39,481 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:39,482 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] [2019-11-06 22:45:39,484 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:39,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:39,490 INFO L82 PathProgramCache]: Analyzing trace with hash -1992146438, now seen corresponding path program 1 times [2019-11-06 22:45:39,500 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:39,501 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349542614] [2019-11-06 22:45:39,501 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:39,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:39,884 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 22:45:39,885 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349542614] [2019-11-06 22:45:39,886 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:45:39,886 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:45:39,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193816482] [2019-11-06 22:45:39,893 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:45:39,896 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:45:39,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:45:39,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:45:39,914 INFO L87 Difference]: Start difference. First operand 292 states. Second operand 4 states. [2019-11-06 22:45:42,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:45:42,177 INFO L93 Difference]: Finished difference Result 997 states and 1776 transitions. [2019-11-06 22:45:42,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:45:42,179 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 39 [2019-11-06 22:45:42,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:45:42,201 INFO L225 Difference]: With dead ends: 997 [2019-11-06 22:45:42,201 INFO L226 Difference]: Without dead ends: 623 [2019-11-06 22:45:42,211 INFO L630 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 [2019-11-06 22:45:42,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2019-11-06 22:45:42,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 620. [2019-11-06 22:45:42,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 620 states. [2019-11-06 22:45:42,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 896 transitions. [2019-11-06 22:45:42,319 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 896 transitions. Word has length 39 [2019-11-06 22:45:42,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:45:42,319 INFO L462 AbstractCegarLoop]: Abstraction has 620 states and 896 transitions. [2019-11-06 22:45:42,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:45:42,320 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 896 transitions. [2019-11-06 22:45:42,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-11-06 22:45:42,326 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:42,326 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:45:42,326 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:42,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:42,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1526241146, now seen corresponding path program 1 times [2019-11-06 22:45:42,327 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:42,327 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641580118] [2019-11-06 22:45:42,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:42,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:42,577 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:45:42,577 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641580118] [2019-11-06 22:45:42,578 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:45:42,578 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:45:42,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277275124] [2019-11-06 22:45:42,583 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:45:42,583 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:45:42,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:45:42,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:45:42,584 INFO L87 Difference]: Start difference. First operand 620 states and 896 transitions. Second operand 6 states. [2019-11-06 22:45:44,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:45:44,162 INFO L93 Difference]: Finished difference Result 1833 states and 2715 transitions. [2019-11-06 22:45:44,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:45:44,163 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 111 [2019-11-06 22:45:44,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:45:44,173 INFO L225 Difference]: With dead ends: 1833 [2019-11-06 22:45:44,174 INFO L226 Difference]: Without dead ends: 1219 [2019-11-06 22:45:44,177 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 22:45:44,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1219 states. [2019-11-06 22:45:44,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1219 to 1200. [2019-11-06 22:45:44,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1200 states. [2019-11-06 22:45:44,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 1734 transitions. [2019-11-06 22:45:44,242 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 1734 transitions. Word has length 111 [2019-11-06 22:45:44,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:45:44,242 INFO L462 AbstractCegarLoop]: Abstraction has 1200 states and 1734 transitions. [2019-11-06 22:45:44,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:45:44,243 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 1734 transitions. [2019-11-06 22:45:44,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-11-06 22:45:44,254 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:44,254 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, 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] [2019-11-06 22:45:44,254 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:44,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:44,255 INFO L82 PathProgramCache]: Analyzing trace with hash 2064876850, now seen corresponding path program 1 times [2019-11-06 22:45:44,255 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:44,255 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629946802] [2019-11-06 22:45:44,256 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:44,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:44,906 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 6 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:45:44,907 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629946802] [2019-11-06 22:45:44,907 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794939896] [2019-11-06 22:45:44,907 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 22:45:45,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:45,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 22:45:45,038 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:45:45,152 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:45:45,263 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 104 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2019-11-06 22:45:45,263 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:45:45,463 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,464 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,465 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,467 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:45:45,469 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,471 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,471 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,473 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,475 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 22:45:45,581 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 22:45:45,710 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 64 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:45:45,711 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:45:45,711 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12, 5] total 17 [2019-11-06 22:45:45,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985713128] [2019-11-06 22:45:45,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:45:45,712 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:45:45,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:45:45,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2019-11-06 22:45:45,713 INFO L87 Difference]: Start difference. First operand 1200 states and 1734 transitions. Second operand 5 states. [2019-11-06 22:45:47,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:45:47,524 INFO L93 Difference]: Finished difference Result 2827 states and 4067 transitions. [2019-11-06 22:45:47,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 22:45:47,528 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 213 [2019-11-06 22:45:47,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:45:47,537 INFO L225 Difference]: With dead ends: 2827 [2019-11-06 22:45:47,538 INFO L226 Difference]: Without dead ends: 1633 [2019-11-06 22:45:47,541 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 423 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2019-11-06 22:45:47,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2019-11-06 22:45:47,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1601. [2019-11-06 22:45:47,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1601 states. [2019-11-06 22:45:47,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1601 states to 1601 states and 2178 transitions. [2019-11-06 22:45:47,593 INFO L78 Accepts]: Start accepts. Automaton has 1601 states and 2178 transitions. Word has length 213 [2019-11-06 22:45:47,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:45:47,593 INFO L462 AbstractCegarLoop]: Abstraction has 1601 states and 2178 transitions. [2019-11-06 22:45:47,593 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:45:47,594 INFO L276 IsEmpty]: Start isEmpty. Operand 1601 states and 2178 transitions. [2019-11-06 22:45:47,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2019-11-06 22:45:47,597 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:47,598 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:45:47,801 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:45:47,802 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:47,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:47,802 INFO L82 PathProgramCache]: Analyzing trace with hash -957711129, now seen corresponding path program 1 times [2019-11-06 22:45:47,803 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:47,803 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244087751] [2019-11-06 22:45:47,803 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:47,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-06 22:45:48,099 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244087751] [2019-11-06 22:45:48,100 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:45:48,100 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:45:48,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447542934] [2019-11-06 22:45:48,101 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:45:48,101 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:45:48,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:45:48,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:45:48,102 INFO L87 Difference]: Start difference. First operand 1601 states and 2178 transitions. Second operand 5 states. [2019-11-06 22:45:50,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:45:50,570 INFO L93 Difference]: Finished difference Result 5139 states and 7638 transitions. [2019-11-06 22:45:50,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 22:45:50,575 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 266 [2019-11-06 22:45:50,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:45:50,596 INFO L225 Difference]: With dead ends: 5139 [2019-11-06 22:45:50,597 INFO L226 Difference]: Without dead ends: 3544 [2019-11-06 22:45:50,602 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:45:50,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3544 states. [2019-11-06 22:45:50,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3544 to 3533. [2019-11-06 22:45:50,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3533 states. [2019-11-06 22:45:50,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3533 states to 3533 states and 4948 transitions. [2019-11-06 22:45:50,715 INFO L78 Accepts]: Start accepts. Automaton has 3533 states and 4948 transitions. Word has length 266 [2019-11-06 22:45:50,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:45:50,718 INFO L462 AbstractCegarLoop]: Abstraction has 3533 states and 4948 transitions. [2019-11-06 22:45:50,718 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:45:50,718 INFO L276 IsEmpty]: Start isEmpty. Operand 3533 states and 4948 transitions. [2019-11-06 22:45:50,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2019-11-06 22:45:50,732 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:50,732 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, 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, 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] [2019-11-06 22:45:50,733 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:50,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:50,733 INFO L82 PathProgramCache]: Analyzing trace with hash -196527469, now seen corresponding path program 1 times [2019-11-06 22:45:50,735 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:50,735 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184839594] [2019-11-06 22:45:50,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:50,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:51,134 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 188 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:45:51,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184839594] [2019-11-06 22:45:51,136 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227942403] [2019-11-06 22:45:51,136 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 22:45:51,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:51,279 INFO L256 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-06 22:45:51,301 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:45:51,473 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2019-11-06 22:45:51,473 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:45:51,576 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2019-11-06 22:45:51,577 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-06 22:45:51,577 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2019-11-06 22:45:51,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231676592] [2019-11-06 22:45:51,579 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:45:51,580 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:45:51,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:45:51,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:45:51,580 INFO L87 Difference]: Start difference. First operand 3533 states and 4948 transitions. Second operand 4 states. [2019-11-06 22:45:52,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:45:52,305 INFO L93 Difference]: Finished difference Result 7054 states and 9904 transitions. [2019-11-06 22:45:52,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:45:52,317 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 340 [2019-11-06 22:45:52,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:45:52,339 INFO L225 Difference]: With dead ends: 7054 [2019-11-06 22:45:52,340 INFO L226 Difference]: Without dead ends: 3527 [2019-11-06 22:45:52,350 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 676 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:45:52,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3527 states. [2019-11-06 22:45:52,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3527 to 3527. [2019-11-06 22:45:52,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3527 states. [2019-11-06 22:45:52,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3527 states to 3527 states and 4932 transitions. [2019-11-06 22:45:52,460 INFO L78 Accepts]: Start accepts. Automaton has 3527 states and 4932 transitions. Word has length 340 [2019-11-06 22:45:52,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:45:52,460 INFO L462 AbstractCegarLoop]: Abstraction has 3527 states and 4932 transitions. [2019-11-06 22:45:52,461 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:45:52,461 INFO L276 IsEmpty]: Start isEmpty. Operand 3527 states and 4932 transitions. [2019-11-06 22:45:52,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2019-11-06 22:45:52,517 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:45:52,518 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:45:52,721 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:45:52,722 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:45:52,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:45:52,723 INFO L82 PathProgramCache]: Analyzing trace with hash 968760147, now seen corresponding path program 1 times [2019-11-06 22:45:52,723 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:45:52,724 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15021015] [2019-11-06 22:45:52,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:45:52,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:52,981 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 271 proven. 76 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 22:45:52,982 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15021015] [2019-11-06 22:45:52,982 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055611304] [2019-11-06 22:45:52,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:45:53,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:45:53,147 INFO L256 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 22:45:53,155 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:45:53,342 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 253 proven. 2 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-06 22:45:53,342 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:45:53,498 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 253 proven. 2 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-06 22:45:53,498 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1959016762] [2019-11-06 22:45:53,504 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 345 [2019-11-06 22:45:53,566 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:45:53,566 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)