./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd6d4490a7412402195d3193de0347508566f7c8 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 17:26:54,535 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 17:26:54,537 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 17:26:54,545 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 17:26:54,545 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 17:26:54,546 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 17:26:54,547 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 17:26:54,548 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 17:26:54,550 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 17:26:54,550 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 17:26:54,551 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 17:26:54,551 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 17:26:54,552 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 17:26:54,552 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 17:26:54,553 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 17:26:54,554 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 17:26:54,555 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 17:26:54,556 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 17:26:54,557 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 17:26:54,559 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 17:26:54,559 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 17:26:54,560 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 17:26:54,561 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 17:26:54,562 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 17:26:54,562 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 17:26:54,562 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 17:26:54,563 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 17:26:54,563 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 17:26:54,564 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 17:26:54,564 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 17:26:54,564 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 17:26:54,565 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 17:26:54,565 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 17:26:54,565 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 17:26:54,565 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 17:26:54,566 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 17:26:54,566 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 17:26:54,573 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 17:26:54,573 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 17:26:54,574 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 17:26:54,574 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 17:26:54,574 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 17:26:54,575 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 17:26:54,575 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 17:26:54,576 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 17:26:54,576 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 17:26:54,576 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 17:26:54,577 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd6d4490a7412402195d3193de0347508566f7c8 [2018-12-09 17:26:54,594 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 17:26:54,600 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 17:26:54,602 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 17:26:54,603 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 17:26:54,603 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 17:26:54,604 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c [2018-12-09 17:26:54,637 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/data/19058ca87/e6aed7d8488b4f34bd3b1538743a75a5/FLAG5f1cb0ff5 [2018-12-09 17:26:55,045 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 17:26:55,045 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c [2018-12-09 17:26:55,049 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/data/19058ca87/e6aed7d8488b4f34bd3b1538743a75a5/FLAG5f1cb0ff5 [2018-12-09 17:26:55,056 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/data/19058ca87/e6aed7d8488b4f34bd3b1538743a75a5 [2018-12-09 17:26:55,058 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 17:26:55,059 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 17:26:55,059 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 17:26:55,060 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 17:26:55,061 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 17:26:55,062 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,064 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3163dfbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55, skipping insertion in model container [2018-12-09 17:26:55,064 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,070 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 17:26:55,081 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 17:26:55,168 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:26:55,170 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 17:26:55,179 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:26:55,187 INFO L195 MainTranslator]: Completed translation [2018-12-09 17:26:55,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55 WrapperNode [2018-12-09 17:26:55,187 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 17:26:55,187 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 17:26:55,188 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 17:26:55,188 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 17:26:55,194 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,198 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,203 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 17:26:55,203 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 17:26:55,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 17:26:55,204 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 17:26:55,211 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,211 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,215 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,216 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,217 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... [2018-12-09 17:26:55,217 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 17:26:55,218 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 17:26:55,218 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 17:26:55,218 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 17:26:55,218 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/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 [2018-12-09 17:26:55,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 17:26:55,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 17:26:55,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 17:26:55,279 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 17:26:55,279 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 17:26:55,279 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 17:26:55,279 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2018-12-09 17:26:55,279 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2018-12-09 17:26:55,279 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2018-12-09 17:26:55,279 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2018-12-09 17:26:55,376 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 17:26:55,376 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-09 17:26:55,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:26:55 BoogieIcfgContainer [2018-12-09 17:26:55,377 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 17:26:55,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 17:26:55,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 17:26:55,379 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 17:26:55,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:26:55" (1/3) ... [2018-12-09 17:26:55,380 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb89205 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:26:55, skipping insertion in model container [2018-12-09 17:26:55,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:26:55" (2/3) ... [2018-12-09 17:26:55,380 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb89205 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:26:55, skipping insertion in model container [2018-12-09 17:26:55,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:26:55" (3/3) ... [2018-12-09 17:26:55,381 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8_true-unreach-call_true-termination.c [2018-12-09 17:26:55,387 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 17:26:55,391 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 17:26:55,401 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 17:26:55,420 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 17:26:55,420 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 17:26:55,420 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 17:26:55,420 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 17:26:55,420 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 17:26:55,420 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 17:26:55,420 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 17:26:55,420 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 17:26:55,431 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2018-12-09 17:26:55,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 17:26:55,434 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:55,435 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:26:55,436 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:55,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:55,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2018-12-09 17:26:55,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:55,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:55,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,470 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:55,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:55,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:26:55,532 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:26:55,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:26:55,532 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:26:55,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:26:55,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:26:55,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:26:55,543 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2018-12-09 17:26:55,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:55,598 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2018-12-09 17:26:55,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:26:55,599 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-09 17:26:55,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:55,605 INFO L225 Difference]: With dead ends: 44 [2018-12-09 17:26:55,605 INFO L226 Difference]: Without dead ends: 30 [2018-12-09 17:26:55,607 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-09 17:26:55,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-09 17:26:55,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-09 17:26:55,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 17:26:55,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2018-12-09 17:26:55,632 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2018-12-09 17:26:55,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:55,632 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2018-12-09 17:26:55,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:26:55,632 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2018-12-09 17:26:55,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-09 17:26:55,633 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:55,633 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:26:55,634 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:55,634 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:55,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2018-12-09 17:26:55,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:55,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:55,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,635 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:55,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:55,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:26:55,654 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:26:55,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:26:55,655 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:26:55,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:26:55,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:26:55,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:26:55,656 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2018-12-09 17:26:55,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:55,691 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2018-12-09 17:26:55,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:26:55,691 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-12-09 17:26:55,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:55,692 INFO L225 Difference]: With dead ends: 36 [2018-12-09 17:26:55,692 INFO L226 Difference]: Without dead ends: 32 [2018-12-09 17:26:55,693 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-09 17:26:55,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-09 17:26:55,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2018-12-09 17:26:55,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 17:26:55,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2018-12-09 17:26:55,697 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2018-12-09 17:26:55,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:55,697 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2018-12-09 17:26:55,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:26:55,697 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2018-12-09 17:26:55,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-09 17:26:55,698 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:55,698 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:26:55,698 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:55,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:55,699 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2018-12-09 17:26:55,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:55,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:55,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,700 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:55,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:55,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 17:26:55,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:55,735 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:26:55,736 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2018-12-09 17:26:55,737 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [31], [32], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [56], [57], [58], [59] [2018-12-09 17:26:55,756 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:26:55,756 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:26:55,817 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-09 17:26:55,817 INFO L272 AbstractInterpreter]: Visited 12 different actions 12 times. Never merged. Never widened. Performed 15 root evaluator evaluations with a maximum evaluation depth of 3. Performed 15 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 5 variables. [2018-12-09 17:26:55,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:55,822 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-09 17:26:55,848 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2018-12-09 17:26:55,848 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-09 17:26:55,862 INFO L418 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2018-12-09 17:26:55,862 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-09 17:26:55,862 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-09 17:26:55,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-12-09 17:26:55,862 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:26:55,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 17:26:55,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 17:26:55,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-12-09 17:26:55,863 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2018-12-09 17:26:55,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:55,974 INFO L93 Difference]: Finished difference Result 72 states and 95 transitions. [2018-12-09 17:26:55,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 17:26:55,974 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-12-09 17:26:55,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:55,975 INFO L225 Difference]: With dead ends: 72 [2018-12-09 17:26:55,975 INFO L226 Difference]: Without dead ends: 48 [2018-12-09 17:26:55,976 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2018-12-09 17:26:55,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-09 17:26:55,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2018-12-09 17:26:55,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-09 17:26:55,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2018-12-09 17:26:55,981 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 26 [2018-12-09 17:26:55,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:55,981 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2018-12-09 17:26:55,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 17:26:55,981 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2018-12-09 17:26:55,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-09 17:26:55,982 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:55,983 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 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] [2018-12-09 17:26:55,983 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:55,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:55,983 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2018-12-09 17:26:55,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:55,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:55,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:55,984 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:55,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-09 17:26:56,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:56,021 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:26:56,022 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-12-09 17:26:56,022 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [35], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-12-09 17:26:56,023 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:26:56,023 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:26:56,110 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-09 17:26:56,111 INFO L272 AbstractInterpreter]: Visited 28 different actions 313 times. Never merged. Widened at 2 different actions 18 times. Performed 647 root evaluator evaluations with a maximum evaluation depth of 4. Performed 647 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 29 fixpoints after 6 different actions. Largest state had 5 variables. [2018-12-09 17:26:56,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:56,115 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-09 17:26:56,124 INFO L227 lantSequenceWeakener]: Weakened 7 states. On average, predicates are now at 50% of their original sizes. [2018-12-09 17:26:56,124 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-09 17:26:56,144 INFO L418 sIntCurrentIteration]: We unified 38 AI predicates to 38 [2018-12-09 17:26:56,144 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-09 17:26:56,144 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-09 17:26:56,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [6] total 13 [2018-12-09 17:26:56,144 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:26:56,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-09 17:26:56,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-09 17:26:56,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-12-09 17:26:56,145 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 9 states. [2018-12-09 17:26:56,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:56,302 INFO L93 Difference]: Finished difference Result 87 states and 106 transitions. [2018-12-09 17:26:56,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 17:26:56,302 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 39 [2018-12-09 17:26:56,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:56,303 INFO L225 Difference]: With dead ends: 87 [2018-12-09 17:26:56,303 INFO L226 Difference]: Without dead ends: 55 [2018-12-09 17:26:56,304 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2018-12-09 17:26:56,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-09 17:26:56,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-09 17:26:56,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-09 17:26:56,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-12-09 17:26:56,311 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2018-12-09 17:26:56,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:56,311 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-12-09 17:26:56,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-09 17:26:56,311 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-12-09 17:26:56,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-12-09 17:26:56,312 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:56,313 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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] [2018-12-09 17:26:56,313 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:56,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:56,313 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2018-12-09 17:26:56,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:56,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:56,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:56,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:56,314 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:56,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:56,362 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-12-09 17:26:56,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:56,362 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:26:56,362 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:26:56,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:26:56,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:56,363 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:26:56,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:26:56,369 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:26:56,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 17:26:56,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:26:56,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:26:56,447 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-12-09 17:26:56,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:26:56,663 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-09 17:26:56,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:26:56,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2018-12-09 17:26:56,678 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:26:56,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-09 17:26:56,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-09 17:26:56,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2018-12-09 17:26:56,679 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 11 states. [2018-12-09 17:26:56,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:56,828 INFO L93 Difference]: Finished difference Result 121 states and 177 transitions. [2018-12-09 17:26:56,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-09 17:26:56,828 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2018-12-09 17:26:56,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:56,829 INFO L225 Difference]: With dead ends: 121 [2018-12-09 17:26:56,829 INFO L226 Difference]: Without dead ends: 76 [2018-12-09 17:26:56,830 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-12-09 17:26:56,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-09 17:26:56,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2018-12-09 17:26:56,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-09 17:26:56,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2018-12-09 17:26:56,837 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 52 [2018-12-09 17:26:56,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:56,837 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2018-12-09 17:26:56,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-09 17:26:56,837 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2018-12-09 17:26:56,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-09 17:26:56,838 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:56,838 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 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] [2018-12-09 17:26:56,838 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:56,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:56,838 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2018-12-09 17:26:56,838 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:56,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:56,839 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:26:56,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:56,839 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:56,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:56,883 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-12-09 17:26:56,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:56,883 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:26:56,883 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 56 with the following transitions: [2018-12-09 17:26:56,884 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-12-09 17:26:56,885 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:26:56,885 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:26:57,574 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-09 17:26:57,574 INFO L272 AbstractInterpreter]: Visited 29 different actions 4700 times. Merged at 11 different actions 1218 times. Widened at 2 different actions 234 times. Performed 10886 root evaluator evaluations with a maximum evaluation depth of 4. Performed 10886 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 580 fixpoints after 9 different actions. Largest state had 5 variables. [2018-12-09 17:26:57,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:57,579 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-09 17:26:57,591 INFO L227 lantSequenceWeakener]: Weakened 11 states. On average, predicates are now at 50% of their original sizes. [2018-12-09 17:26:57,591 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-09 17:26:57,638 INFO L418 sIntCurrentIteration]: We unified 54 AI predicates to 54 [2018-12-09 17:26:57,638 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-09 17:26:57,638 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-09 17:26:57,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [7] total 16 [2018-12-09 17:26:57,638 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:26:57,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-09 17:26:57,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-09 17:26:57,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-12-09 17:26:57,639 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand 11 states. [2018-12-09 17:26:57,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:26:57,844 INFO L93 Difference]: Finished difference Result 109 states and 136 transitions. [2018-12-09 17:26:57,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 17:26:57,844 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-12-09 17:26:57,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:26:57,845 INFO L225 Difference]: With dead ends: 109 [2018-12-09 17:26:57,845 INFO L226 Difference]: Without dead ends: 68 [2018-12-09 17:26:57,846 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2018-12-09 17:26:57,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-09 17:26:57,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-12-09 17:26:57,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-12-09 17:26:57,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2018-12-09 17:26:57,853 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 55 [2018-12-09 17:26:57,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:26:57,854 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2018-12-09 17:26:57,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-09 17:26:57,854 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2018-12-09 17:26:57,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-09 17:26:57,855 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:26:57,855 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 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] [2018-12-09 17:26:57,856 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:26:57,856 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:26:57,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1768644787, now seen corresponding path program 1 times [2018-12-09 17:26:57,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:26:57,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:57,857 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:26:57,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:26:57,857 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:26:57,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:26:57,904 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 16 proven. 15 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2018-12-09 17:26:57,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:26:57,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:26:57,904 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 68 with the following transitions: [2018-12-09 17:26:57,905 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [35], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-12-09 17:26:57,906 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:26:57,906 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:27:03,567 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 17:27:03,567 INFO L272 AbstractInterpreter]: Visited 34 different actions 66811 times. Merged at 16 different actions 20941 times. Widened at 4 different actions 2001 times. Performed 164403 root evaluator evaluations with a maximum evaluation depth of 4. Performed 164403 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 9083 fixpoints after 10 different actions. Largest state had 5 variables. [2018-12-09 17:27:03,569 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:03,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 17:27:03,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:03,569 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:03,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:03,575 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:03,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:03,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:03,645 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-12-09 17:27:03,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:04,065 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-12-09 17:27:04,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:04,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 13] total 18 [2018-12-09 17:27:04,080 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:04,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-09 17:27:04,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-09 17:27:04,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-12-09 17:27:04,081 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand 12 states. [2018-12-09 17:27:04,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:04,222 INFO L93 Difference]: Finished difference Result 144 states and 218 transitions. [2018-12-09 17:27:04,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-09 17:27:04,222 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2018-12-09 17:27:04,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:04,223 INFO L225 Difference]: With dead ends: 144 [2018-12-09 17:27:04,224 INFO L226 Difference]: Without dead ends: 95 [2018-12-09 17:27:04,224 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 117 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2018-12-09 17:27:04,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-12-09 17:27:04,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 70. [2018-12-09 17:27:04,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-09 17:27:04,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2018-12-09 17:27:04,231 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 67 [2018-12-09 17:27:04,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:04,232 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2018-12-09 17:27:04,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-09 17:27:04,232 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2018-12-09 17:27:04,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-09 17:27:04,233 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:04,233 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:04,233 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:04,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:04,233 INFO L82 PathProgramCache]: Analyzing trace with hash 650896746, now seen corresponding path program 1 times [2018-12-09 17:27:04,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:04,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:04,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:04,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:04,234 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:04,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:04,305 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 39 proven. 39 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2018-12-09 17:27:04,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:04,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:04,305 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 82 with the following transitions: [2018-12-09 17:27:04,305 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [35], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-12-09 17:27:04,306 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 17:27:04,306 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 17:27:04,585 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-12-09 17:27:04,586 INFO L272 AbstractInterpreter]: Visited 29 different actions 3227 times. Merged at 11 different actions 856 times. Widened at 2 different actions 130 times. Performed 7980 root evaluator evaluations with a maximum evaluation depth of 4. Performed 7980 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 384 fixpoints after 9 different actions. Largest state had 5 variables. [2018-12-09 17:27:04,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:04,588 INFO L401 sIntCurrentIteration]: Generating AbsInt predicates [2018-12-09 17:27:04,598 INFO L227 lantSequenceWeakener]: Weakened 19 states. On average, predicates are now at 55.26% of their original sizes. [2018-12-09 17:27:04,599 INFO L416 sIntCurrentIteration]: Unifying AI predicates [2018-12-09 17:27:04,671 INFO L418 sIntCurrentIteration]: We unified 80 AI predicates to 80 [2018-12-09 17:27:04,671 INFO L427 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-12-09 17:27:04,671 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-09 17:27:04,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [15] imperfect sequences [11] total 24 [2018-12-09 17:27:04,672 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:27:04,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-09 17:27:04,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-09 17:27:04,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-12-09 17:27:04,672 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 15 states. [2018-12-09 17:27:04,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:04,972 INFO L93 Difference]: Finished difference Result 136 states and 177 transitions. [2018-12-09 17:27:04,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-09 17:27:04,973 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-12-09 17:27:04,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:04,974 INFO L225 Difference]: With dead ends: 136 [2018-12-09 17:27:04,974 INFO L226 Difference]: Without dead ends: 88 [2018-12-09 17:27:04,974 INFO L631 BasicCegarLoop]: 2 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2018-12-09 17:27:04,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-09 17:27:04,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-09 17:27:04,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-09 17:27:04,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 109 transitions. [2018-12-09 17:27:04,980 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 109 transitions. Word has length 81 [2018-12-09 17:27:04,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:04,981 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 109 transitions. [2018-12-09 17:27:04,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-09 17:27:04,981 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 109 transitions. [2018-12-09 17:27:04,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-09 17:27:04,982 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:04,982 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:04,982 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:04,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:04,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1708632044, now seen corresponding path program 2 times [2018-12-09 17:27:04,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:04,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:04,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:04,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:04,983 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:04,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:05,063 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 68 proven. 48 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2018-12-09 17:27:05,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:05,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:05,064 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:05,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:05,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:05,064 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:05,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:27:05,070 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:27:05,079 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 17:27:05,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:05,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:05,124 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 67 proven. 15 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2018-12-09 17:27:05,124 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:05,332 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 67 proven. 16 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2018-12-09 17:27:05,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:05,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 9] total 20 [2018-12-09 17:27:05,347 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:05,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 17:27:05,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 17:27:05,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2018-12-09 17:27:05,348 INFO L87 Difference]: Start difference. First operand 88 states and 109 transitions. Second operand 16 states. [2018-12-09 17:27:05,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:05,619 INFO L93 Difference]: Finished difference Result 218 states and 340 transitions. [2018-12-09 17:27:05,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-09 17:27:05,620 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2018-12-09 17:27:05,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:05,621 INFO L225 Difference]: With dead ends: 218 [2018-12-09 17:27:05,621 INFO L226 Difference]: Without dead ends: 147 [2018-12-09 17:27:05,622 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 202 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=174, Invalid=882, Unknown=0, NotChecked=0, Total=1056 [2018-12-09 17:27:05,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-12-09 17:27:05,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 117. [2018-12-09 17:27:05,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-09 17:27:05,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 166 transitions. [2018-12-09 17:27:05,637 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 166 transitions. Word has length 108 [2018-12-09 17:27:05,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:05,637 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 166 transitions. [2018-12-09 17:27:05,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 17:27:05,637 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 166 transitions. [2018-12-09 17:27:05,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-09 17:27:05,639 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:05,640 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 11, 11, 10, 9, 8, 8, 8, 8, 8, 8, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:05,640 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:05,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:05,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1764149606, now seen corresponding path program 3 times [2018-12-09 17:27:05,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:05,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:05,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:05,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:05,641 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:05,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:05,733 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 187 proven. 21 refuted. 0 times theorem prover too weak. 725 trivial. 0 not checked. [2018-12-09 17:27:05,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:05,734 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:05,734 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:05,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:05,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:05,734 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:05,741 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:27:05,742 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:27:05,765 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:27:05,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:05,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:05,873 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 55 proven. 281 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2018-12-09 17:27:05,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:06,514 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 55 proven. 297 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-12-09 17:27:06,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:06,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 15] total 24 [2018-12-09 17:27:06,529 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:06,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 17:27:06,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 17:27:06,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2018-12-09 17:27:06,529 INFO L87 Difference]: Start difference. First operand 117 states and 166 transitions. Second operand 17 states. [2018-12-09 17:27:06,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:06,839 INFO L93 Difference]: Finished difference Result 319 states and 576 transitions. [2018-12-09 17:27:06,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-09 17:27:06,839 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-12-09 17:27:06,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:06,841 INFO L225 Difference]: With dead ends: 319 [2018-12-09 17:27:06,841 INFO L226 Difference]: Without dead ends: 194 [2018-12-09 17:27:06,842 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 350 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2018-12-09 17:27:06,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-12-09 17:27:06,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 135. [2018-12-09 17:27:06,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-09 17:27:06,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 198 transitions. [2018-12-09 17:27:06,855 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 198 transitions. Word has length 188 [2018-12-09 17:27:06,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:06,855 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 198 transitions. [2018-12-09 17:27:06,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 17:27:06,855 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 198 transitions. [2018-12-09 17:27:06,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-12-09 17:27:06,857 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:06,857 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 15, 13, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:06,857 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:06,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:06,857 INFO L82 PathProgramCache]: Analyzing trace with hash 790923186, now seen corresponding path program 4 times [2018-12-09 17:27:06,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:06,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:06,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:06,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:06,858 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:06,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:06,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 198 proven. 174 refuted. 0 times theorem prover too weak. 1223 trivial. 0 not checked. [2018-12-09 17:27:06,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:06,910 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:06,910 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:06,910 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:06,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:06,910 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:06,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:06,917 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:06,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:06,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:07,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 92 proven. 439 refuted. 0 times theorem prover too weak. 1064 trivial. 0 not checked. [2018-12-09 17:27:07,120 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:08,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 92 proven. 463 refuted. 0 times theorem prover too weak. 1040 trivial. 0 not checked. [2018-12-09 17:27:08,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:08,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 17] total 23 [2018-12-09 17:27:08,039 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:08,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 17:27:08,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 17:27:08,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2018-12-09 17:27:08,039 INFO L87 Difference]: Start difference. First operand 135 states and 198 transitions. Second operand 16 states. [2018-12-09 17:27:08,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:08,304 INFO L93 Difference]: Finished difference Result 356 states and 720 transitions. [2018-12-09 17:27:08,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-09 17:27:08,305 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 245 [2018-12-09 17:27:08,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:08,306 INFO L225 Difference]: With dead ends: 356 [2018-12-09 17:27:08,307 INFO L226 Difference]: Without dead ends: 210 [2018-12-09 17:27:08,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 460 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=226, Invalid=964, Unknown=0, NotChecked=0, Total=1190 [2018-12-09 17:27:08,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2018-12-09 17:27:08,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 149. [2018-12-09 17:27:08,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-12-09 17:27:08,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 223 transitions. [2018-12-09 17:27:08,321 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 223 transitions. Word has length 245 [2018-12-09 17:27:08,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:08,322 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 223 transitions. [2018-12-09 17:27:08,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 17:27:08,322 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 223 transitions. [2018-12-09 17:27:08,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-12-09 17:27:08,327 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:08,327 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 20, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:08,327 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:08,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:08,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1059403098, now seen corresponding path program 5 times [2018-12-09 17:27:08,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:08,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:08,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:08,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:08,328 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:08,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:08,466 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 351 proven. 479 refuted. 0 times theorem prover too weak. 3784 trivial. 0 not checked. [2018-12-09 17:27:08,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:08,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:08,467 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:08,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:08,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:08,467 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:08,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:27:08,474 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:27:08,491 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 17:27:08,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:08,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:08,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 680 proven. 3 refuted. 0 times theorem prover too weak. 3931 trivial. 0 not checked. [2018-12-09 17:27:08,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:09,147 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 547 proven. 5 refuted. 0 times theorem prover too weak. 4062 trivial. 0 not checked. [2018-12-09 17:27:09,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:09,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 19 [2018-12-09 17:27:09,163 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:09,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 17:27:09,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 17:27:09,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2018-12-09 17:27:09,164 INFO L87 Difference]: Start difference. First operand 149 states and 223 transitions. Second operand 16 states. [2018-12-09 17:27:09,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:09,319 INFO L93 Difference]: Finished difference Result 274 states and 448 transitions. [2018-12-09 17:27:09,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-09 17:27:09,319 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 405 [2018-12-09 17:27:09,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:09,320 INFO L225 Difference]: With dead ends: 274 [2018-12-09 17:27:09,320 INFO L226 Difference]: Without dead ends: 151 [2018-12-09 17:27:09,321 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 797 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=566, Unknown=0, NotChecked=0, Total=702 [2018-12-09 17:27:09,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-09 17:27:09,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2018-12-09 17:27:09,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-09 17:27:09,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 201 transitions. [2018-12-09 17:27:09,333 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 201 transitions. Word has length 405 [2018-12-09 17:27:09,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:09,333 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 201 transitions. [2018-12-09 17:27:09,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 17:27:09,333 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 201 transitions. [2018-12-09 17:27:09,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 534 [2018-12-09 17:27:09,336 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:09,337 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 35, 35, 34, 30, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:09,337 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:09,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:09,337 INFO L82 PathProgramCache]: Analyzing trace with hash 899949547, now seen corresponding path program 6 times [2018-12-09 17:27:09,337 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:09,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:09,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:09,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:09,338 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:09,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:09,534 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 318 proven. 1100 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-12-09 17:27:09,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:09,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:09,534 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:09,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:09,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:09,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:09,540 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:27:09,540 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:27:09,597 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:27:09,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:09,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:09,691 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 320 proven. 1095 refuted. 0 times theorem prover too weak. 6789 trivial. 0 not checked. [2018-12-09 17:27:09,691 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:11,139 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 321 proven. 1115 refuted. 0 times theorem prover too weak. 6768 trivial. 0 not checked. [2018-12-09 17:27:11,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:11,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 18] total 24 [2018-12-09 17:27:11,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:11,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 17:27:11,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 17:27:11,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2018-12-09 17:27:11,156 INFO L87 Difference]: Start difference. First operand 145 states and 201 transitions. Second operand 16 states. [2018-12-09 17:27:11,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:11,317 INFO L93 Difference]: Finished difference Result 260 states and 472 transitions. [2018-12-09 17:27:11,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-09 17:27:11,317 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 533 [2018-12-09 17:27:11,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:11,319 INFO L225 Difference]: With dead ends: 260 [2018-12-09 17:27:11,319 INFO L226 Difference]: Without dead ends: 153 [2018-12-09 17:27:11,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1090 GetRequests, 1046 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2018-12-09 17:27:11,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-12-09 17:27:11,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2018-12-09 17:27:11,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-09 17:27:11,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 206 transitions. [2018-12-09 17:27:11,328 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 206 transitions. Word has length 533 [2018-12-09 17:27:11,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:11,329 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 206 transitions. [2018-12-09 17:27:11,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 17:27:11,329 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 206 transitions. [2018-12-09 17:27:11,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2018-12-09 17:27:11,331 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:11,331 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 21, 19, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 9, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:11,331 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:11,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:11,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1178546065, now seen corresponding path program 7 times [2018-12-09 17:27:11,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:11,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:11,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:11,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:11,332 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:11,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:11,473 INFO L134 CoverageAnalysis]: Checked inductivity of 3213 backedges. 427 proven. 242 refuted. 0 times theorem prover too weak. 2544 trivial. 0 not checked. [2018-12-09 17:27:11,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:11,474 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:11,474 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:11,474 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:11,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:11,474 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:11,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:11,480 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:11,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:11,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:11,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3213 backedges. 248 proven. 453 refuted. 0 times theorem prover too weak. 2512 trivial. 0 not checked. [2018-12-09 17:27:11,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 3213 backedges. 250 proven. 467 refuted. 0 times theorem prover too weak. 2496 trivial. 0 not checked. [2018-12-09 17:27:12,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:12,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 25 [2018-12-09 17:27:12,450 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:12,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-09 17:27:12,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-09 17:27:12,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2018-12-09 17:27:12,451 INFO L87 Difference]: Start difference. First operand 153 states and 206 transitions. Second operand 19 states. [2018-12-09 17:27:12,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:12,831 INFO L93 Difference]: Finished difference Result 363 states and 572 transitions. [2018-12-09 17:27:12,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-09 17:27:12,831 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 341 [2018-12-09 17:27:12,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:12,833 INFO L225 Difference]: With dead ends: 363 [2018-12-09 17:27:12,833 INFO L226 Difference]: Without dead ends: 197 [2018-12-09 17:27:12,834 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 658 SyntacticMatches, 13 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=349, Invalid=1631, Unknown=0, NotChecked=0, Total=1980 [2018-12-09 17:27:12,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-12-09 17:27:12,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 178. [2018-12-09 17:27:12,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-09 17:27:12,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 259 transitions. [2018-12-09 17:27:12,842 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 259 transitions. Word has length 341 [2018-12-09 17:27:12,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:12,842 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 259 transitions. [2018-12-09 17:27:12,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-09 17:27:12,842 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 259 transitions. [2018-12-09 17:27:12,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2018-12-09 17:27:12,844 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:12,844 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 29, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:12,844 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:12,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:12,844 INFO L82 PathProgramCache]: Analyzing trace with hash -102941920, now seen corresponding path program 8 times [2018-12-09 17:27:12,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:12,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:12,845 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:12,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:12,845 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:12,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:13,004 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 511 proven. 771 refuted. 0 times theorem prover too weak. 5558 trivial. 0 not checked. [2018-12-09 17:27:13,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:13,004 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:13,004 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:13,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:13,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:13,005 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:13,010 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:27:13,011 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:27:13,091 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-09 17:27:13,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:13,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:13,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 3692 proven. 34 refuted. 0 times theorem prover too weak. 3114 trivial. 0 not checked. [2018-12-09 17:27:13,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:14,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 519 proven. 707 refuted. 0 times theorem prover too weak. 5614 trivial. 0 not checked. [2018-12-09 17:27:14,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:14,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13] total 22 [2018-12-09 17:27:14,043 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:14,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 17:27:14,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 17:27:14,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2018-12-09 17:27:14,044 INFO L87 Difference]: Start difference. First operand 178 states and 259 transitions. Second operand 17 states. [2018-12-09 17:27:14,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:14,311 INFO L93 Difference]: Finished difference Result 362 states and 599 transitions. [2018-12-09 17:27:14,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-09 17:27:14,311 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 490 [2018-12-09 17:27:14,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:14,313 INFO L225 Difference]: With dead ends: 362 [2018-12-09 17:27:14,313 INFO L226 Difference]: Without dead ends: 212 [2018-12-09 17:27:14,314 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1006 GetRequests, 963 SyntacticMatches, 11 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=205, Invalid=917, Unknown=0, NotChecked=0, Total=1122 [2018-12-09 17:27:14,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-09 17:27:14,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 206. [2018-12-09 17:27:14,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-09 17:27:14,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 298 transitions. [2018-12-09 17:27:14,323 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 298 transitions. Word has length 490 [2018-12-09 17:27:14,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:14,324 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 298 transitions. [2018-12-09 17:27:14,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 17:27:14,324 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 298 transitions. [2018-12-09 17:27:14,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-12-09 17:27:14,326 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:14,326 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 29, 29, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:14,326 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:14,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:14,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1516560835, now seen corresponding path program 9 times [2018-12-09 17:27:14,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:14,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:14,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:14,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:14,327 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:14,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:14,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7248 backedges. 419 proven. 637 refuted. 0 times theorem prover too weak. 6192 trivial. 0 not checked. [2018-12-09 17:27:14,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:14,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:14,488 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:14,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:14,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:14,488 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:14,496 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:27:14,496 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:27:14,564 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:27:14,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:14,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:14,734 INFO L134 CoverageAnalysis]: Checked inductivity of 7248 backedges. 386 proven. 765 refuted. 0 times theorem prover too weak. 6097 trivial. 0 not checked. [2018-12-09 17:27:14,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:15,876 INFO L134 CoverageAnalysis]: Checked inductivity of 7248 backedges. 388 proven. 779 refuted. 0 times theorem prover too weak. 6081 trivial. 0 not checked. [2018-12-09 17:27:15,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:15,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 16] total 27 [2018-12-09 17:27:15,901 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:15,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-09 17:27:15,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-09 17:27:15,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2018-12-09 17:27:15,902 INFO L87 Difference]: Start difference. First operand 206 states and 298 transitions. Second operand 20 states. [2018-12-09 17:27:16,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:16,328 INFO L93 Difference]: Finished difference Result 436 states and 710 transitions. [2018-12-09 17:27:16,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-09 17:27:16,329 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 503 [2018-12-09 17:27:16,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:16,330 INFO L225 Difference]: With dead ends: 436 [2018-12-09 17:27:16,330 INFO L226 Difference]: Without dead ends: 217 [2018-12-09 17:27:16,332 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1030 GetRequests, 977 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=282, Invalid=1358, Unknown=0, NotChecked=0, Total=1640 [2018-12-09 17:27:16,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-12-09 17:27:16,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 195. [2018-12-09 17:27:16,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-12-09 17:27:16,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 272 transitions. [2018-12-09 17:27:16,346 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 272 transitions. Word has length 503 [2018-12-09 17:27:16,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:16,347 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 272 transitions. [2018-12-09 17:27:16,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-09 17:27:16,347 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 272 transitions. [2018-12-09 17:27:16,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2018-12-09 17:27:16,351 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:16,351 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 25, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:16,351 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:16,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:16,351 INFO L82 PathProgramCache]: Analyzing trace with hash 933744578, now seen corresponding path program 10 times [2018-12-09 17:27:16,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:16,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:16,352 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:16,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:16,352 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:16,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:16,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 591 proven. 444 refuted. 0 times theorem prover too weak. 4317 trivial. 0 not checked. [2018-12-09 17:27:16,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:16,554 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:16,554 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:16,554 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:16,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:16,554 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:16,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:16,560 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:16,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:16,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:16,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 393 proven. 387 refuted. 0 times theorem prover too weak. 4572 trivial. 0 not checked. [2018-12-09 17:27:16,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:17,435 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 395 proven. 395 refuted. 0 times theorem prover too weak. 4562 trivial. 0 not checked. [2018-12-09 17:27:17,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:17,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 13] total 24 [2018-12-09 17:27:17,451 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:17,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-09 17:27:17,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-09 17:27:17,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2018-12-09 17:27:17,452 INFO L87 Difference]: Start difference. First operand 195 states and 272 transitions. Second operand 19 states. [2018-12-09 17:27:17,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:17,906 INFO L93 Difference]: Finished difference Result 390 states and 592 transitions. [2018-12-09 17:27:17,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-09 17:27:17,906 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 435 [2018-12-09 17:27:17,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:17,908 INFO L225 Difference]: With dead ends: 390 [2018-12-09 17:27:17,908 INFO L226 Difference]: Without dead ends: 220 [2018-12-09 17:27:17,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 851 SyntacticMatches, 11 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=326, Invalid=1654, Unknown=0, NotChecked=0, Total=1980 [2018-12-09 17:27:17,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-12-09 17:27:17,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 208. [2018-12-09 17:27:17,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-12-09 17:27:17,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 277 transitions. [2018-12-09 17:27:17,917 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 277 transitions. Word has length 435 [2018-12-09 17:27:17,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:17,917 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 277 transitions. [2018-12-09 17:27:17,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-09 17:27:17,917 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 277 transitions. [2018-12-09 17:27:17,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 423 [2018-12-09 17:27:17,918 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:17,918 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 25, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:17,919 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:17,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:17,919 INFO L82 PathProgramCache]: Analyzing trace with hash -620759121, now seen corresponding path program 11 times [2018-12-09 17:27:17,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:17,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:17,919 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:17,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:17,919 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:17,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 596 proven. 155 refuted. 0 times theorem prover too weak. 4265 trivial. 0 not checked. [2018-12-09 17:27:18,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:18,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:18,017 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:18,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:18,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:18,017 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:18,024 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:27:18,024 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:27:18,049 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-09 17:27:18,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:18,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 652 proven. 99 refuted. 0 times theorem prover too weak. 4265 trivial. 0 not checked. [2018-12-09 17:27:18,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:18,769 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 656 proven. 105 refuted. 0 times theorem prover too weak. 4255 trivial. 0 not checked. [2018-12-09 17:27:18,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:18,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13] total 17 [2018-12-09 17:27:18,784 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:18,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-09 17:27:18,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-09 17:27:18,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2018-12-09 17:27:18,785 INFO L87 Difference]: Start difference. First operand 208 states and 277 transitions. Second operand 12 states. [2018-12-09 17:27:18,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:18,892 INFO L93 Difference]: Finished difference Result 221 states and 289 transitions. [2018-12-09 17:27:18,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-09 17:27:18,893 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 422 [2018-12-09 17:27:18,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:18,894 INFO L225 Difference]: With dead ends: 221 [2018-12-09 17:27:18,894 INFO L226 Difference]: Without dead ends: 211 [2018-12-09 17:27:18,894 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 830 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=432, Unknown=0, NotChecked=0, Total=552 [2018-12-09 17:27:18,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-12-09 17:27:18,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-12-09 17:27:18,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-12-09 17:27:18,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 269 transitions. [2018-12-09 17:27:18,902 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 269 transitions. Word has length 422 [2018-12-09 17:27:18,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:18,902 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 269 transitions. [2018-12-09 17:27:18,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-09 17:27:18,903 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 269 transitions. [2018-12-09 17:27:18,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 586 [2018-12-09 17:27:18,905 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:18,905 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 41, 41, 36, 32, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 16, 10, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:18,905 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:18,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:18,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1978964261, now seen corresponding path program 12 times [2018-12-09 17:27:18,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:18,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:18,906 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:18,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:18,906 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:18,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:19,119 INFO L134 CoverageAnalysis]: Checked inductivity of 9874 backedges. 747 proven. 913 refuted. 0 times theorem prover too weak. 8214 trivial. 0 not checked. [2018-12-09 17:27:19,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:19,120 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:19,120 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:19,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:19,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:19,120 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:19,127 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:27:19,127 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:27:19,194 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:27:19,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:19,199 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:19,362 INFO L134 CoverageAnalysis]: Checked inductivity of 9874 backedges. 591 proven. 772 refuted. 0 times theorem prover too weak. 8511 trivial. 0 not checked. [2018-12-09 17:27:19,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:20,550 INFO L134 CoverageAnalysis]: Checked inductivity of 9874 backedges. 591 proven. 786 refuted. 0 times theorem prover too weak. 8497 trivial. 0 not checked. [2018-12-09 17:27:20,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:20,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12, 16] total 28 [2018-12-09 17:27:20,565 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:20,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-09 17:27:20,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-09 17:27:20,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2018-12-09 17:27:20,565 INFO L87 Difference]: Start difference. First operand 205 states and 269 transitions. Second operand 21 states. [2018-12-09 17:27:20,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:20,954 INFO L93 Difference]: Finished difference Result 423 states and 601 transitions. [2018-12-09 17:27:20,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-09 17:27:20,954 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 585 [2018-12-09 17:27:20,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:20,956 INFO L225 Difference]: With dead ends: 423 [2018-12-09 17:27:20,956 INFO L226 Difference]: Without dead ends: 232 [2018-12-09 17:27:20,957 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1204 GetRequests, 1146 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=1719, Unknown=0, NotChecked=0, Total=2070 [2018-12-09 17:27:20,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-12-09 17:27:20,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 202. [2018-12-09 17:27:20,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-12-09 17:27:20,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 260 transitions. [2018-12-09 17:27:20,967 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 260 transitions. Word has length 585 [2018-12-09 17:27:20,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:20,967 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 260 transitions. [2018-12-09 17:27:20,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-09 17:27:20,968 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 260 transitions. [2018-12-09 17:27:20,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 655 [2018-12-09 17:27:20,971 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:20,971 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 46, 46, 39, 38, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 16, 14, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:20,972 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:20,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:20,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1544481050, now seen corresponding path program 13 times [2018-12-09 17:27:20,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:20,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:20,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:20,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:20,973 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:20,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:21,302 INFO L134 CoverageAnalysis]: Checked inductivity of 12404 backedges. 1090 proven. 692 refuted. 0 times theorem prover too weak. 10622 trivial. 0 not checked. [2018-12-09 17:27:21,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:21,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:21,302 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:21,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:21,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:21,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:21,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:21,309 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:21,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:21,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:21,563 INFO L134 CoverageAnalysis]: Checked inductivity of 12404 backedges. 633 proven. 1146 refuted. 0 times theorem prover too weak. 10625 trivial. 0 not checked. [2018-12-09 17:27:21,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:23,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12404 backedges. 630 proven. 1170 refuted. 0 times theorem prover too weak. 10604 trivial. 0 not checked. [2018-12-09 17:27:23,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:23,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 18] total 25 [2018-12-09 17:27:23,029 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:23,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 17:27:23,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 17:27:23,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2018-12-09 17:27:23,030 INFO L87 Difference]: Start difference. First operand 202 states and 260 transitions. Second operand 17 states. [2018-12-09 17:27:23,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:23,164 INFO L93 Difference]: Finished difference Result 230 states and 297 transitions. [2018-12-09 17:27:23,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-09 17:27:23,164 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 654 [2018-12-09 17:27:23,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:23,166 INFO L225 Difference]: With dead ends: 230 [2018-12-09 17:27:23,166 INFO L226 Difference]: Without dead ends: 187 [2018-12-09 17:27:23,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1333 GetRequests, 1287 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=206, Invalid=786, Unknown=0, NotChecked=0, Total=992 [2018-12-09 17:27:23,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-09 17:27:23,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 184. [2018-12-09 17:27:23,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-09 17:27:23,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 228 transitions. [2018-12-09 17:27:23,177 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 228 transitions. Word has length 654 [2018-12-09 17:27:23,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:23,177 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 228 transitions. [2018-12-09 17:27:23,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 17:27:23,178 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 228 transitions. [2018-12-09 17:27:23,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2018-12-09 17:27:23,180 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:23,180 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:23,180 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:23,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:23,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 14 times [2018-12-09 17:27:23,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:23,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:23,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:23,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:23,181 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:23,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:23,919 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-12-09 17:27:23,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:23,919 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:23,919 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:23,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:23,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:23,919 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:23,925 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 17:27:23,925 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 17:27:24,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-09 17:27:24,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:24,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:24,657 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-12-09 17:27:24,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:27,001 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-12-09 17:27:27,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:27,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-12-09 17:27:27,016 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:27,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-09 17:27:27,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-09 17:27:27,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2018-12-09 17:27:27,017 INFO L87 Difference]: Start difference. First operand 184 states and 228 transitions. Second operand 52 states. [2018-12-09 17:27:27,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:27,450 INFO L93 Difference]: Finished difference Result 213 states and 260 transitions. [2018-12-09 17:27:27,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-09 17:27:27,450 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 463 [2018-12-09 17:27:27,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:27,451 INFO L225 Difference]: With dead ends: 213 [2018-12-09 17:27:27,451 INFO L226 Difference]: Without dead ends: 206 [2018-12-09 17:27:27,452 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 942 SyntacticMatches, 70 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2018-12-09 17:27:27,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-12-09 17:27:27,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2018-12-09 17:27:27,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-12-09 17:27:27,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 252 transitions. [2018-12-09 17:27:27,459 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 252 transitions. Word has length 463 [2018-12-09 17:27:27,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:27,459 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 252 transitions. [2018-12-09 17:27:27,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-09 17:27:27,460 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 252 transitions. [2018-12-09 17:27:27,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2018-12-09 17:27:27,461 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:27,461 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 29, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:27,461 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:27,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:27,462 INFO L82 PathProgramCache]: Analyzing trace with hash -656328782, now seen corresponding path program 15 times [2018-12-09 17:27:27,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:27,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:27,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:27,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:27,462 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:27,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:27,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 341 proven. 1131 refuted. 0 times theorem prover too weak. 5368 trivial. 0 not checked. [2018-12-09 17:27:27,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:27,630 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:27,630 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:27,630 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:27,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:27,630 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:27,638 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 17:27:27,638 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 17:27:27,683 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 17:27:27,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 17:27:27,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:27,802 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 334 proven. 953 refuted. 0 times theorem prover too weak. 5553 trivial. 0 not checked. [2018-12-09 17:27:27,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 333 proven. 975 refuted. 0 times theorem prover too weak. 5532 trivial. 0 not checked. [2018-12-09 17:27:29,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:29,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 18] total 30 [2018-12-09 17:27:29,268 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:29,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-09 17:27:29,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-09 17:27:29,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2018-12-09 17:27:29,269 INFO L87 Difference]: Start difference. First operand 205 states and 252 transitions. Second operand 22 states. [2018-12-09 17:27:29,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:29,614 INFO L93 Difference]: Finished difference Result 354 states and 449 transitions. [2018-12-09 17:27:29,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-09 17:27:29,614 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 490 [2018-12-09 17:27:29,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:29,615 INFO L225 Difference]: With dead ends: 354 [2018-12-09 17:27:29,615 INFO L226 Difference]: Without dead ends: 192 [2018-12-09 17:27:29,616 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1013 GetRequests, 952 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=366, Invalid=1796, Unknown=0, NotChecked=0, Total=2162 [2018-12-09 17:27:29,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-12-09 17:27:29,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 175. [2018-12-09 17:27:29,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-09 17:27:29,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 212 transitions. [2018-12-09 17:27:29,625 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 212 transitions. Word has length 490 [2018-12-09 17:27:29,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:29,626 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 212 transitions. [2018-12-09 17:27:29,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-09 17:27:29,626 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 212 transitions. [2018-12-09 17:27:29,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2018-12-09 17:27:29,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:27:29,628 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 30, 29, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:27:29,629 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:27:29,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:27:29,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1638954211, now seen corresponding path program 16 times [2018-12-09 17:27:29,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:27:29,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:29,630 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 17:27:29,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:27:29,630 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:27:29,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:29,847 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 1313 proven. 334 refuted. 0 times theorem prover too weak. 5614 trivial. 0 not checked. [2018-12-09 17:27:29,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:29,847 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 17:27:29,847 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 17:27:29,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 17:27:29,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 17:27:29,847 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 17:27:29,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:27:29,855 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 17:27:29,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:27:29,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 17:27:30,032 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 948 proven. 208 refuted. 0 times theorem prover too weak. 6105 trivial. 0 not checked. [2018-12-09 17:27:30,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 17:27:31,055 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 946 proven. 224 refuted. 0 times theorem prover too weak. 6091 trivial. 0 not checked. [2018-12-09 17:27:31,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 17:27:31,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 16] total 29 [2018-12-09 17:27:31,070 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 17:27:31,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-09 17:27:31,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-09 17:27:31,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2018-12-09 17:27:31,071 INFO L87 Difference]: Start difference. First operand 175 states and 212 transitions. Second operand 22 states. [2018-12-09 17:27:31,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:27:31,486 INFO L93 Difference]: Finished difference Result 218 states and 260 transitions. [2018-12-09 17:27:31,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-09 17:27:31,486 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 504 [2018-12-09 17:27:31,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:27:31,486 INFO L225 Difference]: With dead ends: 218 [2018-12-09 17:27:31,486 INFO L226 Difference]: Without dead ends: 0 [2018-12-09 17:27:31,487 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1048 GetRequests, 987 SyntacticMatches, 14 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=1964, Unknown=0, NotChecked=0, Total=2352 [2018-12-09 17:27:31,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-09 17:27:31,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-09 17:27:31,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-09 17:27:31,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-09 17:27:31,488 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 504 [2018-12-09 17:27:31,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:27:31,488 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-09 17:27:31,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-09 17:27:31,488 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-09 17:27:31,488 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-09 17:27:31,491 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-09 17:27:31,558 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,563 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,567 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,574 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,585 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,604 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,608 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,615 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:31,835 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,182 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,242 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,316 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,330 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,337 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,361 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,399 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,413 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,499 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:32,547 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-12-09 17:27:33,106 WARN L180 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 32 [2018-12-09 17:27:33,223 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 8 [2018-12-09 17:27:33,721 WARN L180 SmtUtils]: Spent 489.00 ms on a formula simplification. DAG size of input: 226 DAG size of output: 49 [2018-12-09 17:27:33,723 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-09 17:27:33,723 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-09 17:27:33,723 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-09 17:27:33,723 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-09 17:27:33,723 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-09 17:27:33,723 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-09 17:27:33,723 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2018-12-09 17:27:33,723 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2018-12-09 17:27:33,723 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L39(line 39) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L38(lines 38 40) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L444 ceAbstractionStarter]: At program point L37(line 37) the Hoare annotation is: (and (<= 8 main_~x~0) (<= main_~x~0 8)) [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L37-1(line 37) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L451 ceAbstractionStarter]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2018-12-09 17:27:33,724 INFO L444 ceAbstractionStarter]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (< 4 |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n)) [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L23-1(line 23) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L444 ceAbstractionStarter]: At program point L23-2(line 23) the Hoare annotation is: (and (or (and (<= 3 |fibo2_#t~ret2|) (<= |fibo2_#t~ret2| 3)) (not (= |fibo2_#in~n| 5))) (<= fibo2_~n |fibo2_#in~n|) (< 4 |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (or (<= |fibo2_#in~n| 5) (and (<= |fibo2_#t~ret2| 5) (<= 5 |fibo2_#t~ret2|)) (<= 7 |fibo2_#in~n|)) (or (and (<= |fibo2_#t~ret2| 8) (<= 8 |fibo2_#t~ret2|)) (not (= |fibo2_#in~n| 7)))) [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L20(lines 20 24) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L23-3(line 23) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L18(lines 18 24) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2018-12-09 17:27:33,724 INFO L451 ceAbstractionStarter]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2018-12-09 17:27:33,724 INFO L444 ceAbstractionStarter]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (< 1 fibo1_~n) (<= |fibo1_#in~n| fibo1_~n)) [2018-12-09 17:27:33,724 INFO L448 ceAbstractionStarter]: For program point L13-1(line 13) no Hoare annotation was computed. [2018-12-09 17:27:33,725 INFO L444 ceAbstractionStarter]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse0 (<= |fibo1_#in~n| 2)) (.cse1 (<= |fibo1_#in~n| 4))) (and (or .cse0 (and (<= 2 |fibo1_#t~ret0|) (<= |fibo1_#t~ret0| 2) .cse1) (< 5 |fibo1_#in~n|) (and (<= 3 |fibo1_#t~ret0|) (<= |fibo1_#t~ret0| 3) (<= 5 |fibo1_#in~n|))) (let ((.cse2 (<= fibo1_~n |fibo1_#in~n|))) (let ((.cse3 (and .cse2 (<= 3 |fibo1_#in~n|)))) (or (and .cse2 (<= 1 |fibo1_#t~ret0|) (< 1 fibo1_~n) .cse0 (<= |fibo1_#t~ret0| 1)) (and .cse3 (<= 5 fibo1_~n) (<= |fibo1_#in~n| fibo1_~n)) (and (<= 4 fibo1_~n) .cse3 .cse1)))) (or (and (<= |fibo1_#t~ret0| 5) (<= 5 |fibo1_#t~ret0|)) (not (= |fibo1_#in~n| 6))) (or (not (= |fibo1_#in~n| 8)) (and (<= |fibo1_#t~ret0| 13) (<= 13 |fibo1_#t~ret0|))))) [2018-12-09 17:27:33,725 INFO L448 ceAbstractionStarter]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2018-12-09 17:27:33,725 INFO L448 ceAbstractionStarter]: For program point L10(lines 10 14) no Hoare annotation was computed. [2018-12-09 17:27:33,725 INFO L448 ceAbstractionStarter]: For program point L13-3(line 13) no Hoare annotation was computed. [2018-12-09 17:27:33,725 INFO L448 ceAbstractionStarter]: For program point L8(lines 8 14) no Hoare annotation was computed. [2018-12-09 17:27:33,725 INFO L448 ceAbstractionStarter]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2018-12-09 17:27:33,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:27:33 BoogieIcfgContainer [2018-12-09 17:27:33,726 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 17:27:33,727 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 17:27:33,727 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 17:27:33,727 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 17:27:33,727 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:26:55" (3/4) ... [2018-12-09 17:27:33,729 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-09 17:27:33,732 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-09 17:27:33,733 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-09 17:27:33,733 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2018-12-09 17:27:33,733 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2018-12-09 17:27:33,735 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-09 17:27:33,735 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-09 17:27:33,735 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-09 17:27:33,763 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_c8d8b8b9-f517-43f6-b2d5-44e6150f9743/bin-2019/utaipan/witness.graphml [2018-12-09 17:27:33,763 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 17:27:33,764 INFO L168 Benchmark]: Toolchain (without parser) took 38705.25 ms. Allocated memory was 1.0 GB in the beginning and 4.1 GB in the end (delta: 3.0 GB). Free memory was 958.8 MB in the beginning and 3.4 GB in the end (delta: -2.5 GB). Peak memory consumption was 578.7 MB. Max. memory is 11.5 GB. [2018-12-09 17:27:33,764 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:27:33,764 INFO L168 Benchmark]: CACSL2BoogieTranslator took 127.75 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 947.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-12-09 17:27:33,765 INFO L168 Benchmark]: Boogie Procedure Inliner took 15.79 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:27:33,765 INFO L168 Benchmark]: Boogie Preprocessor took 14.10 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:27:33,765 INFO L168 Benchmark]: RCFGBuilder took 159.00 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 133.2 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -166.6 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. [2018-12-09 17:27:33,765 INFO L168 Benchmark]: TraceAbstraction took 38349.11 ms. Allocated memory was 1.2 GB in the beginning and 4.1 GB in the end (delta: 2.9 GB). Free memory was 1.1 GB in the beginning and 3.5 GB in the end (delta: -2.4 GB). Peak memory consumption was 3.2 GB. Max. memory is 11.5 GB. [2018-12-09 17:27:33,766 INFO L168 Benchmark]: Witness Printer took 36.60 ms. Allocated memory is still 4.1 GB. Free memory was 3.5 GB in the beginning and 3.4 GB in the end (delta: 61.8 MB). Peak memory consumption was 61.8 MB. Max. memory is 11.5 GB. [2018-12-09 17:27:33,767 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 127.75 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 947.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 15.79 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 14.10 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 159.00 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 133.2 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -166.6 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 38349.11 ms. Allocated memory was 1.2 GB in the beginning and 4.1 GB in the end (delta: 2.9 GB). Free memory was 1.1 GB in the beginning and 3.5 GB in the end (delta: -2.4 GB). Peak memory consumption was 3.2 GB. Max. memory is 11.5 GB. * Witness Printer took 36.60 ms. Allocated memory is still 4.1 GB. Free memory was 3.5 GB in the beginning and 3.4 GB in the end (delta: 61.8 MB). Peak memory consumption was 61.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. SAFE Result, 38.3s OverallTime, 23 OverallIterations, 49 TraceHistogramMax, 5.7s AutomataDifference, 0.0s DeadEndRemovalTime, 2.2s HoareAnnotationTime, HoareTripleCheckerStatistics: 875 SDtfs, 1183 SDslu, 8624 SDs, 0 SdLazy, 8176 SolverSat, 1129 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.6s Time, PredicateUnifierStatistics: 8 DeclaredPredicates, 13739 GetRequests, 12828 SyntacticMatches, 263 SemanticMatches, 648 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4678 ImplicationChecksByTransitivity, 6.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=208occurred in iteration=17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 6.8s AbstIntTime, 5 AbstIntIterations, 4 AbstIntStrong, 0.8604060913705583 AbsIntWeakeningRatio, 0.5685279187817259 AbsIntAvgWeakeningVarsNumRemoved, 0.20812182741116753 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 23 MinimizatonAttempts, 318 StatesRemovedByMinimization, 17 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 1172 PreInvPairs, 2586 NumberOfFragments, 184 HoareAnnotationTreeSize, 1172 FomulaSimplifications, 394011 FormulaSimplificationTreeSizeReduction, 1.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 21118 FormulaSimplificationTreeSizeReductionInter, 1.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 20.5s InterpolantComputationTime, 13198 NumberOfCodeBlocks, 12055 NumberOfCodeBlocksAsserted, 110 NumberOfCheckSat, 19626 ConstructedInterpolants, 0 QuantifiedInterpolants, 13345531 SizeOfPredicates, 105 NumberOfNonLiveVariables, 11618 ConjunctsInSsa, 482 ConjunctsInUnsatCore, 57 InterpolantComputations, 2 PerfectInterpolantSequences, 230179/257759 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...