./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/sum04_true-unreach-call_true-termination.i --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_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/sum04_true-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 1dbb3ffac91b20f4dd3e7b4eb671e84b2870fc33 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 19:39:45,234 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 19:39:45,235 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 19:39:45,243 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 19:39:45,243 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 19:39:45,243 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 19:39:45,244 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 19:39:45,245 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 19:39:45,246 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 19:39:45,247 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 19:39:45,248 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 19:39:45,248 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 19:39:45,248 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 19:39:45,249 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 19:39:45,250 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 19:39:45,250 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 19:39:45,251 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 19:39:45,252 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 19:39:45,253 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 19:39:45,254 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 19:39:45,255 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 19:39:45,256 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 19:39:45,257 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 19:39:45,258 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 19:39:45,258 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 19:39:45,258 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 19:39:45,259 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 19:39:45,260 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 19:39:45,260 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 19:39:45,261 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 19:39:45,261 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 19:39:45,262 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 19:39:45,262 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 19:39:45,262 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 19:39:45,263 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 19:39:45,263 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 19:39:45,263 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 19:39:45,273 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 19:39:45,274 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 19:39:45,274 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 19:39:45,274 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 19:39:45,275 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 19:39:45,275 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 19:39:45,276 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 19:39:45,276 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 19:39:45,276 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 19:39:45,276 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 19:39:45,277 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 19:39:45,278 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 19:39:45,278 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 19:39:45,278 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 19:39:45,279 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 19:39:45,279 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 19:39:45,279 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 19:39:45,279 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 19:39:45,279 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_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 -> 1dbb3ffac91b20f4dd3e7b4eb671e84b2870fc33 [2018-12-09 19:39:45,302 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 19:39:45,311 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 19:39:45,314 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 19:39:45,315 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 19:39:45,315 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 19:39:45,316 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/../../sv-benchmarks/c/loops/sum04_true-unreach-call_true-termination.i [2018-12-09 19:39:45,361 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/data/33493e523/d8e31de5e1ee42f28377ca064b45eea5/FLAGc0271e829 [2018-12-09 19:39:45,695 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 19:39:45,695 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/sv-benchmarks/c/loops/sum04_true-unreach-call_true-termination.i [2018-12-09 19:39:45,698 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/data/33493e523/d8e31de5e1ee42f28377ca064b45eea5/FLAGc0271e829 [2018-12-09 19:39:46,096 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/data/33493e523/d8e31de5e1ee42f28377ca064b45eea5 [2018-12-09 19:39:46,098 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 19:39:46,099 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 19:39:46,099 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 19:39:46,099 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 19:39:46,101 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 19:39:46,102 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,103 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1be0f211 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46, skipping insertion in model container [2018-12-09 19:39:46,103 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,109 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 19:39:46,117 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 19:39:46,201 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 19:39:46,204 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 19:39:46,212 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 19:39:46,219 INFO L195 MainTranslator]: Completed translation [2018-12-09 19:39:46,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46 WrapperNode [2018-12-09 19:39:46,220 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 19:39:46,220 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 19:39:46,220 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 19:39:46,220 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 19:39:46,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,231 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,236 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 19:39:46,236 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 19:39:46,236 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 19:39:46,236 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 19:39:46,244 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,244 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,251 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... [2018-12-09 19:39:46,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 19:39:46,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 19:39:46,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 19:39:46,253 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 19:39:46,253 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:46,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 19:39:46,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 19:39:46,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 19:39:46,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 19:39:46,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 19:39:46,313 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 19:39:46,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-12-09 19:39:46,313 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-12-09 19:39:46,391 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 19:39:46,391 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-09 19:39:46,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:39:46 BoogieIcfgContainer [2018-12-09 19:39:46,392 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 19:39:46,392 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 19:39:46,392 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 19:39:46,395 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 19:39:46,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 07:39:46" (1/3) ... [2018-12-09 19:39:46,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12d57696 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:39:46, skipping insertion in model container [2018-12-09 19:39:46,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:39:46" (2/3) ... [2018-12-09 19:39:46,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12d57696 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:39:46, skipping insertion in model container [2018-12-09 19:39:46,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:39:46" (3/3) ... [2018-12-09 19:39:46,398 INFO L112 eAbstractionObserver]: Analyzing ICFG sum04_true-unreach-call_true-termination.i [2018-12-09 19:39:46,405 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 19:39:46,411 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 19:39:46,424 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 19:39:46,442 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 19:39:46,442 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 19:39:46,443 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 19:39:46,443 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 19:39:46,443 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 19:39:46,443 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 19:39:46,443 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 19:39:46,443 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 19:39:46,457 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-12-09 19:39:46,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 19:39:46,461 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:46,462 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:46,463 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:46,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,466 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-12-09 19:39:46,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:46,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:46,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,497 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:46,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,529 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 19:39:46,530 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 19:39:46,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-09 19:39:46,531 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 19:39:46,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-12-09 19:39:46,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-12-09 19:39:46,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-09 19:39:46,542 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-12-09 19:39:46,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:46,558 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-12-09 19:39:46,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-12-09 19:39:46,559 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-12-09 19:39:46,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:46,564 INFO L225 Difference]: With dead ends: 29 [2018-12-09 19:39:46,564 INFO L226 Difference]: Without dead ends: 12 [2018-12-09 19:39:46,566 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-09 19:39:46,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-12-09 19:39:46,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-12-09 19:39:46,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-09 19:39:46,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-12-09 19:39:46,586 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-12-09 19:39:46,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:46,586 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-12-09 19:39:46,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-12-09 19:39:46,587 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-12-09 19:39:46,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 19:39:46,587 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:46,587 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:46,588 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:46,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,588 INFO L82 PathProgramCache]: Analyzing trace with hash -15914692, now seen corresponding path program 1 times [2018-12-09 19:39:46,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:46,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:46,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,589 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:46,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,612 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 19:39:46,612 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 19:39:46,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-09 19:39:46,612 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 19:39:46,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-09 19:39:46,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-09 19:39:46,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-09 19:39:46,613 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-12-09 19:39:46,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:46,631 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-12-09 19:39:46,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-09 19:39:46,631 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2018-12-09 19:39:46,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:46,632 INFO L225 Difference]: With dead ends: 19 [2018-12-09 19:39:46,632 INFO L226 Difference]: Without dead ends: 14 [2018-12-09 19:39:46,632 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-09 19:39:46,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-12-09 19:39:46,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2018-12-09 19:39:46,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-09 19:39:46,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-12-09 19:39:46,634 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-12-09 19:39:46,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:46,635 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-12-09 19:39:46,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-09 19:39:46,635 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-12-09 19:39:46,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-09 19:39:46,635 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:46,635 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:46,635 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:46,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1244203718, now seen corresponding path program 1 times [2018-12-09 19:39:46,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:46,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:46,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,636 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:46,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,652 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:46,652 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 13 with the following transitions: [2018-12-09 19:39:46,653 INFO L205 CegarAbsIntRunner]: [0], [4], [10], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-12-09 19:39:46,673 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 19:39:46,674 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 19:39:46,759 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 19:39:46,760 INFO L272 AbstractInterpreter]: Visited 12 different actions 25 times. Merged at 3 different actions 7 times. Never widened. Performed 62 root evaluator evaluations with a maximum evaluation depth of 5. Performed 62 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-12-09 19:39:46,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 19:39:46,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,765 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:46,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:46,772 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:46,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:46,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:46,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:46,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-12-09 19:39:46,828 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:46,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-09 19:39:46,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-09 19:39:46,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-09 19:39:46,829 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states. [2018-12-09 19:39:46,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:46,839 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-12-09 19:39:46,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-09 19:39:46,840 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2018-12-09 19:39:46,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:46,840 INFO L225 Difference]: With dead ends: 21 [2018-12-09 19:39:46,840 INFO L226 Difference]: Without dead ends: 16 [2018-12-09 19:39:46,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-09 19:39:46,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-09 19:39:46,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-12-09 19:39:46,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-09 19:39:46,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-12-09 19:39:46,842 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-12-09 19:39:46,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:46,843 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-12-09 19:39:46,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-09 19:39:46,843 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-12-09 19:39:46,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-09 19:39:46,843 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:46,843 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:46,843 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:46,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,843 INFO L82 PathProgramCache]: Analyzing trace with hash -513951304, now seen corresponding path program 2 times [2018-12-09 19:39:46,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:46,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:46,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,844 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:46,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,876 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:46,876 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:46,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:46,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,876 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:46,882 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:46,882 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:46,889 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 19:39:46,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:46,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:46,893 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:46,931 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:46,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-12-09 19:39:46,945 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:46,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 19:39:46,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 19:39:46,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-09 19:39:46,946 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2018-12-09 19:39:46,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:46,959 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-12-09 19:39:46,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 19:39:46,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-12-09 19:39:46,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:46,959 INFO L225 Difference]: With dead ends: 23 [2018-12-09 19:39:46,959 INFO L226 Difference]: Without dead ends: 18 [2018-12-09 19:39:46,960 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-09 19:39:46,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-09 19:39:46,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-12-09 19:39:46,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-09 19:39:46,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-12-09 19:39:46,962 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-12-09 19:39:46,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:46,962 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-12-09 19:39:46,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 19:39:46,962 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-12-09 19:39:46,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-09 19:39:46,962 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:46,962 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:46,963 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:46,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:46,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1178949302, now seen corresponding path program 3 times [2018-12-09 19:39:46,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:46,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:46,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:46,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:46,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:46,986 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:46,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:46,987 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:46,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:46,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:46,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:46,993 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:39:46,993 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:39:46,998 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:39:46,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:46,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,002 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,036 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,051 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-12-09 19:39:47,051 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-09 19:39:47,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-09 19:39:47,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,052 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2018-12-09 19:39:47,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,067 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-12-09 19:39:47,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-09 19:39:47,067 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-12-09 19:39:47,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,068 INFO L225 Difference]: With dead ends: 25 [2018-12-09 19:39:47,068 INFO L226 Difference]: Without dead ends: 20 [2018-12-09 19:39:47,068 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-12-09 19:39:47,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2018-12-09 19:39:47,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-09 19:39:47,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-12-09 19:39:47,071 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-12-09 19:39:47,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,071 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-12-09 19:39:47,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-09 19:39:47,071 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-12-09 19:39:47,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-09 19:39:47,072 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,072 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,072 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,072 INFO L82 PathProgramCache]: Analyzing trace with hash 263826484, now seen corresponding path program 4 times [2018-12-09 19:39:47,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:47,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,073 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,107 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,108 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,108 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,108 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:47,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:47,114 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:47,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,124 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,176 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,190 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-09 19:39:47,190 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 19:39:47,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 19:39:47,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,191 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2018-12-09 19:39:47,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,203 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-12-09 19:39:47,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 19:39:47,204 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-12-09 19:39:47,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,204 INFO L225 Difference]: With dead ends: 27 [2018-12-09 19:39:47,204 INFO L226 Difference]: Without dead ends: 22 [2018-12-09 19:39:47,204 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-09 19:39:47,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-12-09 19:39:47,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-09 19:39:47,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-12-09 19:39:47,207 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-12-09 19:39:47,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,207 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-12-09 19:39:47,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 19:39:47,207 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-12-09 19:39:47,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-09 19:39:47,207 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,207 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,208 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1299094066, now seen corresponding path program 5 times [2018-12-09 19:39:47,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,209 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:47,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,209 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,240 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,240 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,240 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,240 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:47,246 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:47,247 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:47,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-09 19:39:47,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:47,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,261 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,261 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,299 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2018-12-09 19:39:47,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-09 19:39:47,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-09 19:39:47,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,314 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-12-09 19:39:47,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,331 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-12-09 19:39:47,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-09 19:39:47,331 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-12-09 19:39:47,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,332 INFO L225 Difference]: With dead ends: 29 [2018-12-09 19:39:47,332 INFO L226 Difference]: Without dead ends: 24 [2018-12-09 19:39:47,332 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-09 19:39:47,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-12-09 19:39:47,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-09 19:39:47,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-12-09 19:39:47,334 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-12-09 19:39:47,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,334 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-12-09 19:39:47,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-09 19:39:47,334 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-12-09 19:39:47,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-09 19:39:47,335 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,335 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,335 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,335 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,335 INFO L82 PathProgramCache]: Analyzing trace with hash -241172304, now seen corresponding path program 6 times [2018-12-09 19:39:47,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:47,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,336 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,370 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,371 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,371 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,371 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:47,377 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:39:47,377 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:39:47,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:39:47,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:47,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,427 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 10 [2018-12-09 19:39:47,441 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-09 19:39:47,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-09 19:39:47,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,442 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2018-12-09 19:39:47,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,459 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-12-09 19:39:47,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 19:39:47,459 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2018-12-09 19:39:47,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,460 INFO L225 Difference]: With dead ends: 31 [2018-12-09 19:39:47,460 INFO L226 Difference]: Without dead ends: 26 [2018-12-09 19:39:47,460 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-09 19:39:47,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-12-09 19:39:47,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-09 19:39:47,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-12-09 19:39:47,462 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-12-09 19:39:47,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,462 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-12-09 19:39:47,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-09 19:39:47,462 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-12-09 19:39:47,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-09 19:39:47,463 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,463 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,463 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1326563246, now seen corresponding path program 7 times [2018-12-09 19:39:47,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:47,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,464 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,519 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,519 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,520 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,520 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:47,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:47,525 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:47,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,538 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,600 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 10 [2018-12-09 19:39:47,623 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-09 19:39:47,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-09 19:39:47,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,624 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-12-09 19:39:47,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,642 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-12-09 19:39:47,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-09 19:39:47,642 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-12-09 19:39:47,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,643 INFO L225 Difference]: With dead ends: 32 [2018-12-09 19:39:47,643 INFO L226 Difference]: Without dead ends: 27 [2018-12-09 19:39:47,643 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-09 19:39:47,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-09 19:39:47,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-09 19:39:47,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-09 19:39:47,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-12-09 19:39:47,646 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-12-09 19:39:47,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,646 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-12-09 19:39:47,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-09 19:39:47,647 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-12-09 19:39:47,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-09 19:39:47,647 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,647 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,647 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,647 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,648 INFO L82 PathProgramCache]: Analyzing trace with hash 386905900, now seen corresponding path program 8 times [2018-12-09 19:39:47,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,648 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:47,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,649 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,760 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,760 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,760 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,760 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/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 19:39:47,766 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:47,766 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:47,775 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-09 19:39:47,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:47,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,816 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:47,947 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:47,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-12-09 19:39:47,961 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-09 19:39:47,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-09 19:39:47,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=495, Unknown=0, NotChecked=0, Total=552 [2018-12-09 19:39:47,962 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 13 states. [2018-12-09 19:39:48,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:48,029 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-12-09 19:39:48,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-09 19:39:48,029 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2018-12-09 19:39:48,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:48,029 INFO L225 Difference]: With dead ends: 34 [2018-12-09 19:39:48,029 INFO L226 Difference]: Without dead ends: 29 [2018-12-09 19:39:48,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=537, Unknown=0, NotChecked=0, Total=600 [2018-12-09 19:39:48,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-09 19:39:48,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-09 19:39:48,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-09 19:39:48,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-12-09 19:39:48,032 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-12-09 19:39:48,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:48,032 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-12-09 19:39:48,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-09 19:39:48,032 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-12-09 19:39:48,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-09 19:39:48,033 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:48,033 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:48,033 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:48,033 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:48,033 INFO L82 PathProgramCache]: Analyzing trace with hash -680671446, now seen corresponding path program 9 times [2018-12-09 19:39:48,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:48,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:48,034 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:48,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:48,034 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:48,076 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 19:39:48,076 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 19:39:48,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2018-12-09 19:39:48,076 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 19:39:48,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-09 19:39:48,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-09 19:39:48,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-12-09 19:39:48,077 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 11 states. [2018-12-09 19:39:48,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:48,105 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-12-09 19:39:48,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 19:39:48,106 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2018-12-09 19:39:48,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:48,106 INFO L225 Difference]: With dead ends: 29 [2018-12-09 19:39:48,106 INFO L226 Difference]: Without dead ends: 0 [2018-12-09 19:39:48,107 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-12-09 19:39:48,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-09 19:39:48,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-09 19:39:48,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-09 19:39:48,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-09 19:39:48,107 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2018-12-09 19:39:48,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:48,107 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-09 19:39:48,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-09 19:39:48,108 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-09 19:39:48,108 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-09 19:39:48,111 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-09 19:39:48,163 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-09 19:39:48,164 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-09 19:39:48,164 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-09 19:39:48,164 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 11 17) the Hoare annotation is: true [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 11 17) no Hoare annotation was computed. [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point mainFINAL(lines 11 17) no Hoare annotation was computed. [2018-12-09 19:39:48,164 INFO L448 ceAbstractionStarter]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2018-12-09 19:39:48,165 INFO L444 ceAbstractionStarter]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (and (<= 10 main_~sn~0) (<= 6 main_~i~0) (<= main_~i~0 6) (<= main_~sn~0 10)) (and (<= 1 main_~i~0) (<= main_~i~0 1) (<= main_~sn~0 0) (<= 0 main_~sn~0)) (and (<= 2 main_~i~0) (<= main_~i~0 2) (<= main_~sn~0 2) (<= 2 main_~sn~0)) (and (<= 7 main_~i~0) (<= 12 main_~sn~0) (<= main_~sn~0 12) (<= main_~i~0 7)) (and (<= 6 main_~sn~0) (<= main_~sn~0 6) (<= 4 main_~i~0) (<= main_~i~0 4)) (and (<= 9 main_~i~0) (<= main_~sn~0 16) (< 15 main_~sn~0)) (and (<= main_~i~0 3) (<= main_~sn~0 4) (<= 3 main_~i~0) (<= 4 main_~sn~0)) (and (<= 14 main_~sn~0) (<= 8 main_~i~0) (<= main_~i~0 8) (<= main_~sn~0 14)) (and (<= main_~sn~0 8) (<= 5 main_~i~0) (<= main_~i~0 5) (<= 8 main_~sn~0))) [2018-12-09 19:39:48,165 INFO L444 ceAbstractionStarter]: At program point L13-4(lines 13 15) the Hoare annotation is: (and (<= main_~sn~0 16) (< 15 main_~sn~0)) [2018-12-09 19:39:48,165 INFO L451 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-12-09 19:39:48,165 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-12-09 19:39:48,165 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-12-09 19:39:48,165 INFO L448 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-12-09 19:39:48,165 INFO L448 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-12-09 19:39:48,165 INFO L448 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-12-09 19:39:48,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 07:39:48 BoogieIcfgContainer [2018-12-09 19:39:48,176 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 19:39:48,176 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 19:39:48,176 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 19:39:48,176 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 19:39:48,177 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:39:46" (3/4) ... [2018-12-09 19:39:48,179 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-09 19:39:48,182 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-09 19:39:48,182 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-09 19:39:48,182 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-12-09 19:39:48,184 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2018-12-09 19:39:48,184 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2018-12-09 19:39:48,184 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-09 19:39:48,207 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_f892359a-6f06-4ed1-b7e9-88ec4cf2a199/bin-2019/utaipan/witness.graphml [2018-12-09 19:39:48,207 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 19:39:48,208 INFO L168 Benchmark]: Toolchain (without parser) took 2109.61 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 207.6 MB). Free memory was 949.7 MB in the beginning and 1.1 GB in the end (delta: -199.8 MB). Peak memory consumption was 7.8 MB. Max. memory is 11.5 GB. [2018-12-09 19:39:48,208 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 976.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:39:48,209 INFO L168 Benchmark]: CACSL2BoogieTranslator took 120.70 ms. Allocated memory is still 1.0 GB. Free memory was 949.7 MB in the beginning and 938.9 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2018-12-09 19:39:48,209 INFO L168 Benchmark]: Boogie Procedure Inliner took 15.94 ms. Allocated memory is still 1.0 GB. Free memory is still 938.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:39:48,209 INFO L168 Benchmark]: Boogie Preprocessor took 16.28 ms. Allocated memory is still 1.0 GB. Free memory is still 938.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:39:48,210 INFO L168 Benchmark]: RCFGBuilder took 139.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 938.9 MB in the beginning and 1.1 GB in the end (delta: -179.5 MB). Peak memory consumption was 15.4 MB. Max. memory is 11.5 GB. [2018-12-09 19:39:48,210 INFO L168 Benchmark]: TraceAbstraction took 1783.44 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 70.8 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -35.9 MB). Peak memory consumption was 34.8 MB. Max. memory is 11.5 GB. [2018-12-09 19:39:48,211 INFO L168 Benchmark]: Witness Printer took 31.39 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 4.8 MB). Peak memory consumption was 4.8 MB. Max. memory is 11.5 GB. [2018-12-09 19:39:48,213 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 976.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 120.70 ms. Allocated memory is still 1.0 GB. Free memory was 949.7 MB in the beginning and 938.9 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 15.94 ms. Allocated memory is still 1.0 GB. Free memory is still 938.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 16.28 ms. Allocated memory is still 1.0 GB. Free memory is still 938.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 139.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 938.9 MB in the beginning and 1.1 GB in the end (delta: -179.5 MB). Peak memory consumption was 15.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1783.44 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 70.8 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -35.9 MB). Peak memory consumption was 34.8 MB. Max. memory is 11.5 GB. * Witness Printer took 31.39 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 4.8 MB). Peak memory consumption was 4.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: 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 - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((((((((10 <= sn && 6 <= i) && i <= 6) && sn <= 10) || (((1 <= i && i <= 1) && sn <= 0) && 0 <= sn)) || (((2 <= i && i <= 2) && sn <= 2) && 2 <= sn)) || (((7 <= i && 12 <= sn) && sn <= 12) && i <= 7)) || (((6 <= sn && sn <= 6) && 4 <= i) && i <= 4)) || ((9 <= i && sn <= 16) && 15 < sn)) || (((i <= 3 && sn <= 4) && 3 <= i) && 4 <= sn)) || (((14 <= sn && 8 <= i) && i <= 8) && sn <= 14)) || (((sn <= 8 && 5 <= i) && i <= 5) && 8 <= sn) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. SAFE Result, 1.7s OverallTime, 11 OverallIterations, 9 TraceHistogramMax, 0.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 120 SDtfs, 37 SDslu, 376 SDs, 0 SdLazy, 266 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 375 GetRequests, 270 SyntacticMatches, 22 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 7 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 127 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 352 NumberOfCodeBlocks, 350 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 477 ConstructedInterpolants, 0 QuantifiedInterpolants, 26405 SizeOfPredicates, 8 NumberOfNonLiveVariables, 364 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 27 InterpolantComputations, 3 PerfectInterpolantSequences, 81/693 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...