./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_20x0_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0cd3be1d Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_20x0_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 17db2a72807ac377d533a347dbb668103ea580a0 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-0cd3be1 [2018-11-28 13:31:59,049 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-28 13:31:59,050 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-28 13:31:59,056 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-28 13:31:59,056 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-28 13:31:59,057 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-28 13:31:59,058 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-28 13:31:59,059 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-28 13:31:59,060 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-28 13:31:59,061 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-28 13:31:59,061 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-28 13:31:59,062 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-28 13:31:59,062 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-28 13:31:59,063 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-28 13:31:59,064 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-28 13:31:59,065 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-28 13:31:59,065 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-28 13:31:59,066 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-28 13:31:59,068 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-28 13:31:59,069 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-28 13:31:59,070 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-28 13:31:59,070 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-28 13:31:59,072 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-28 13:31:59,072 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-28 13:31:59,072 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-28 13:31:59,073 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-28 13:31:59,074 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-28 13:31:59,074 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-28 13:31:59,075 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-28 13:31:59,075 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-28 13:31:59,076 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-28 13:31:59,076 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-28 13:31:59,076 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-28 13:31:59,076 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-28 13:31:59,077 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-28 13:31:59,078 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-28 13:31:59,078 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-28 13:31:59,088 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-28 13:31:59,088 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-28 13:31:59,089 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-28 13:31:59,089 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-28 13:31:59,089 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * Use SBE=true [2018-11-28 13:31:59,090 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-28 13:31:59,090 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-28 13:31:59,091 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-28 13:31:59,092 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-28 13:31:59,092 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-28 13:31:59,092 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-28 13:31:59,092 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-28 13:31:59,092 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-28 13:31:59,092 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-28 13:31:59,092 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-28 13:31:59,093 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true 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_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer 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 -> Automizer 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 -> 17db2a72807ac377d533a347dbb668103ea580a0 [2018-11-28 13:31:59,118 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-28 13:31:59,127 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-28 13:31:59,129 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-28 13:31:59,130 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-28 13:31:59,131 INFO L276 PluginConnector]: CDTParser initialized [2018-11-28 13:31:59,131 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/../../sv-benchmarks/c/recursive-simple/sum_20x0_false-unreach-call_true-termination.c [2018-11-28 13:31:59,176 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/data/5473f4a92/9d830cd70cfe4401ad86a3a81e34128b/FLAG4b50e016b [2018-11-28 13:31:59,496 INFO L307 CDTParser]: Found 1 translation units. [2018-11-28 13:31:59,497 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/sv-benchmarks/c/recursive-simple/sum_20x0_false-unreach-call_true-termination.c [2018-11-28 13:31:59,500 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/data/5473f4a92/9d830cd70cfe4401ad86a3a81e34128b/FLAG4b50e016b [2018-11-28 13:31:59,934 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/data/5473f4a92/9d830cd70cfe4401ad86a3a81e34128b [2018-11-28 13:31:59,936 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-28 13:31:59,937 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-28 13:31:59,938 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-28 13:31:59,938 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-28 13:31:59,940 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-28 13:31:59,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 01:31:59" (1/1) ... [2018-11-28 13:31:59,942 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e64dc71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:31:59, skipping insertion in model container [2018-11-28 13:31:59,942 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 01:31:59" (1/1) ... [2018-11-28 13:31:59,947 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-28 13:31:59,955 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-28 13:32:00,050 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 13:32:00,053 INFO L191 MainTranslator]: Completed pre-run [2018-11-28 13:32:00,062 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 13:32:00,069 INFO L195 MainTranslator]: Completed translation [2018-11-28 13:32:00,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00 WrapperNode [2018-11-28 13:32:00,070 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-28 13:32:00,070 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-28 13:32:00,070 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-28 13:32:00,070 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-28 13:32:00,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,078 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,083 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-28 13:32:00,084 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-28 13:32:00,084 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-28 13:32:00,084 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-28 13:32:00,091 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,091 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,092 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,092 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,095 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,095 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... [2018-11-28 13:32:00,096 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-28 13:32:00,096 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-28 13:32:00,096 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-28 13:32:00,096 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-28 13:32:00,097 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-28 13:32:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-28 13:32:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-28 13:32:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-28 13:32:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-28 13:32:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-28 13:32:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-28 13:32:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-28 13:32:00,249 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-28 13:32:00,249 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-28 13:32:00,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 01:32:00 BoogieIcfgContainer [2018-11-28 13:32:00,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-28 13:32:00,251 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-28 13:32:00,251 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-28 13:32:00,252 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-28 13:32:00,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 01:31:59" (1/3) ... [2018-11-28 13:32:00,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dc66018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 01:32:00, skipping insertion in model container [2018-11-28 13:32:00,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 01:32:00" (2/3) ... [2018-11-28 13:32:00,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dc66018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 01:32:00, skipping insertion in model container [2018-11-28 13:32:00,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 01:32:00" (3/3) ... [2018-11-28 13:32:00,255 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_20x0_false-unreach-call_true-termination.c [2018-11-28 13:32:00,261 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-28 13:32:00,265 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-28 13:32:00,273 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-28 13:32:00,291 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-28 13:32:00,291 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-28 13:32:00,292 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-28 13:32:00,292 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-28 13:32:00,292 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-28 13:32:00,292 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-28 13:32:00,292 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-28 13:32:00,292 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-28 13:32:00,292 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-28 13:32:00,306 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-28 13:32:00,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-28 13:32:00,311 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:00,312 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:00,313 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:00,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:00,316 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-11-28 13:32:00,317 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:00,318 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:00,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:00,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:00,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-28 13:32:00,438 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 13:32:00,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-28 13:32:00,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-28 13:32:00,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-28 13:32:00,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-28 13:32:00,451 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-28 13:32:00,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:00,505 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-28 13:32:00,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-28 13:32:00,507 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-28 13:32:00,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:00,513 INFO L225 Difference]: With dead ends: 30 [2018-11-28 13:32:00,513 INFO L226 Difference]: Without dead ends: 18 [2018-11-28 13:32:00,515 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-28 13:32:00,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-28 13:32:00,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-28 13:32:00,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-28 13:32:00,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-28 13:32:00,542 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-28 13:32:00,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:00,542 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-28 13:32:00,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-28 13:32:00,542 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-28 13:32:00,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-28 13:32:00,544 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:00,544 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:00,544 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:00,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:00,544 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-11-28 13:32:00,544 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:00,545 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:00,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,546 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:00,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:00,595 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-28 13:32:00,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:00,595 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:00,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:00,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:00,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:00,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-28 13:32:00,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:00,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-11-28 13:32:00,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-28 13:32:00,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-28 13:32:00,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-28 13:32:00,663 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-28 13:32:00,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:00,742 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-28 13:32:00,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-28 13:32:00,743 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-28 13:32:00,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:00,743 INFO L225 Difference]: With dead ends: 25 [2018-11-28 13:32:00,743 INFO L226 Difference]: Without dead ends: 21 [2018-11-28 13:32:00,744 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-28 13:32:00,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-28 13:32:00,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-28 13:32:00,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-28 13:32:00,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-28 13:32:00,748 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-28 13:32:00,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:00,749 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-28 13:32:00,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-28 13:32:00,749 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-28 13:32:00,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-28 13:32:00,750 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:00,751 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:00,751 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:00,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:00,751 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-11-28 13:32:00,751 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:00,752 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:00,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:00,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:00,817 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-28 13:32:00,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:00,817 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:00,829 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-28 13:32:00,845 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-28 13:32:00,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:00,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:00,856 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-28 13:32:00,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:00,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-11-28 13:32:00,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-28 13:32:00,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-28 13:32:00,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-28 13:32:00,874 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-28 13:32:00,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:00,912 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-28 13:32:00,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-28 13:32:00,912 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-28 13:32:00,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:00,913 INFO L225 Difference]: With dead ends: 28 [2018-11-28 13:32:00,913 INFO L226 Difference]: Without dead ends: 24 [2018-11-28 13:32:00,913 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-28 13:32:00,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-28 13:32:00,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-28 13:32:00,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-28 13:32:00,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-28 13:32:00,916 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-28 13:32:00,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:00,917 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-28 13:32:00,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-28 13:32:00,917 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-28 13:32:00,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-28 13:32:00,917 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:00,918 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:00,918 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:00,918 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:00,918 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-11-28 13:32:00,918 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:00,918 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:00,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,919 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:00,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:00,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:00,994 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-28 13:32:00,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:00,994 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:01,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-28 13:32:01,014 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-28 13:32:01,014 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:01,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:01,029 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-28 13:32:01,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:01,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-11-28 13:32:01,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-28 13:32:01,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-28 13:32:01,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-11-28 13:32:01,044 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-28 13:32:01,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:01,111 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-28 13:32:01,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-28 13:32:01,112 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-28 13:32:01,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:01,113 INFO L225 Difference]: With dead ends: 31 [2018-11-28 13:32:01,113 INFO L226 Difference]: Without dead ends: 27 [2018-11-28 13:32:01,113 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-11-28 13:32:01,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-28 13:32:01,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-28 13:32:01,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-28 13:32:01,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-28 13:32:01,116 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-28 13:32:01,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:01,117 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-28 13:32:01,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-28 13:32:01,117 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-28 13:32:01,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-28 13:32:01,118 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:01,118 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:01,118 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:01,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:01,119 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-11-28 13:32:01,119 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:01,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:01,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:01,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:01,193 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-28 13:32:01,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:01,193 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:01,199 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-28 13:32:01,213 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-28 13:32:01,213 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:01,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:01,231 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-28 13:32:01,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:01,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-11-28 13:32:01,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-28 13:32:01,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-28 13:32:01,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-11-28 13:32:01,255 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-28 13:32:01,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:01,320 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-28 13:32:01,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-28 13:32:01,320 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-28 13:32:01,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:01,321 INFO L225 Difference]: With dead ends: 34 [2018-11-28 13:32:01,321 INFO L226 Difference]: Without dead ends: 30 [2018-11-28 13:32:01,321 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2018-11-28 13:32:01,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-28 13:32:01,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-28 13:32:01,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-28 13:32:01,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-28 13:32:01,326 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-28 13:32:01,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:01,326 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-28 13:32:01,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-28 13:32:01,326 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-28 13:32:01,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-28 13:32:01,327 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:01,327 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:01,327 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:01,328 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:01,328 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-11-28 13:32:01,328 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:01,328 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:01,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,329 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:01,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:01,430 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-28 13:32:01,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:01,430 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:01,440 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-28 13:32:01,456 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-11-28 13:32:01,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:01,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:01,473 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-28 13:32:01,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:01,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-11-28 13:32:01,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-28 13:32:01,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-28 13:32:01,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-11-28 13:32:01,489 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-28 13:32:01,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:01,566 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-28 13:32:01,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-28 13:32:01,567 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-28 13:32:01,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:01,567 INFO L225 Difference]: With dead ends: 37 [2018-11-28 13:32:01,567 INFO L226 Difference]: Without dead ends: 33 [2018-11-28 13:32:01,568 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2018-11-28 13:32:01,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-28 13:32:01,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-28 13:32:01,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-28 13:32:01,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-28 13:32:01,571 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-28 13:32:01,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:01,571 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-28 13:32:01,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-28 13:32:01,571 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-28 13:32:01,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-28 13:32:01,572 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:01,572 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:01,572 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:01,572 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:01,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-11-28 13:32:01,573 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:01,573 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:01,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,573 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:01,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-28 13:32:01,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:01,651 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:01,657 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-28 13:32:01,676 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-11-28 13:32:01,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:01,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:01,693 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-28 13:32:01,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:01,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-11-28 13:32:01,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-28 13:32:01,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-28 13:32:01,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2018-11-28 13:32:01,708 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-28 13:32:01,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:01,770 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-28 13:32:01,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-28 13:32:01,771 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-28 13:32:01,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:01,772 INFO L225 Difference]: With dead ends: 40 [2018-11-28 13:32:01,772 INFO L226 Difference]: Without dead ends: 36 [2018-11-28 13:32:01,772 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2018-11-28 13:32:01,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-28 13:32:01,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-28 13:32:01,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-28 13:32:01,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-28 13:32:01,776 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-28 13:32:01,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:01,776 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-28 13:32:01,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-28 13:32:01,777 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-28 13:32:01,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-28 13:32:01,777 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:01,778 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:01,778 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:01,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:01,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-11-28 13:32:01,778 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:01,778 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:01,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:01,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:01,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:01,863 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-28 13:32:01,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:01,863 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:01,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:01,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:01,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:01,896 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-28 13:32:01,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:01,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-11-28 13:32:01,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-28 13:32:01,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-28 13:32:01,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2018-11-28 13:32:01,912 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-28 13:32:02,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:02,020 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-28 13:32:02,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-28 13:32:02,020 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-28 13:32:02,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:02,021 INFO L225 Difference]: With dead ends: 43 [2018-11-28 13:32:02,021 INFO L226 Difference]: Without dead ends: 39 [2018-11-28 13:32:02,022 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2018-11-28 13:32:02,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-28 13:32:02,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-28 13:32:02,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-28 13:32:02,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-28 13:32:02,027 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-28 13:32:02,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:02,027 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-28 13:32:02,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-28 13:32:02,027 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-28 13:32:02,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-28 13:32:02,028 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:02,028 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:02,028 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:02,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:02,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-11-28 13:32:02,029 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:02,029 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:02,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:02,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:02,123 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-28 13:32:02,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:02,123 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/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 [2018-11-28 13:32:02,135 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-28 13:32:02,170 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-28 13:32:02,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:02,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:02,189 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-28 13:32:02,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:02,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-11-28 13:32:02,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-28 13:32:02,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-28 13:32:02,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-11-28 13:32:02,204 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-28 13:32:02,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:02,303 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-28 13:32:02,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-28 13:32:02,305 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-28 13:32:02,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:02,306 INFO L225 Difference]: With dead ends: 46 [2018-11-28 13:32:02,306 INFO L226 Difference]: Without dead ends: 42 [2018-11-28 13:32:02,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2018-11-28 13:32:02,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-28 13:32:02,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-28 13:32:02,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-28 13:32:02,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-28 13:32:02,311 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-28 13:32:02,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:02,311 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-28 13:32:02,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-28 13:32:02,312 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-28 13:32:02,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-28 13:32:02,312 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:02,312 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:02,313 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:02,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:02,313 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-11-28 13:32:02,313 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:02,313 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:02,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:02,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:02,400 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-28 13:32:02,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:02,401 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:02,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-28 13:32:02,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-28 13:32:02,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:02,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:02,461 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-28 13:32:02,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:02,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-11-28 13:32:02,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-28 13:32:02,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-28 13:32:02,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2018-11-28 13:32:02,477 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-28 13:32:02,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:02,581 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-28 13:32:02,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-28 13:32:02,581 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-28 13:32:02,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:02,582 INFO L225 Difference]: With dead ends: 49 [2018-11-28 13:32:02,582 INFO L226 Difference]: Without dead ends: 45 [2018-11-28 13:32:02,582 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-11-28 13:32:02,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-28 13:32:02,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-28 13:32:02,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-28 13:32:02,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-28 13:32:02,586 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-28 13:32:02,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:02,586 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-28 13:32:02,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-28 13:32:02,586 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-28 13:32:02,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-28 13:32:02,588 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:02,588 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:02,588 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:02,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:02,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-11-28 13:32:02,589 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:02,589 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:02,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:02,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:02,710 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-28 13:32:02,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:02,710 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:02,723 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-28 13:32:02,741 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-28 13:32:02,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:02,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:02,780 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-28 13:32:02,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:02,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-11-28 13:32:02,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-28 13:32:02,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-28 13:32:02,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2018-11-28 13:32:02,797 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-28 13:32:02,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:02,915 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-28 13:32:02,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-28 13:32:02,916 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-28 13:32:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:02,917 INFO L225 Difference]: With dead ends: 52 [2018-11-28 13:32:02,917 INFO L226 Difference]: Without dead ends: 48 [2018-11-28 13:32:02,918 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2018-11-28 13:32:02,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-28 13:32:02,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-28 13:32:02,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-28 13:32:02,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-28 13:32:02,922 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-28 13:32:02,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:02,923 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-28 13:32:02,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-28 13:32:02,923 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-28 13:32:02,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-28 13:32:02,924 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:02,924 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:02,924 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:02,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:02,924 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-11-28 13:32:02,924 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:02,924 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:02,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,925 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:02,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:02,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-28 13:32:03,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:03,023 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:03,030 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-28 13:32:03,053 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-11-28 13:32:03,053 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:03,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:03,094 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-28 13:32:03,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:03,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-11-28 13:32:03,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-28 13:32:03,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-28 13:32:03,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2018-11-28 13:32:03,110 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-28 13:32:03,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:03,223 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-28 13:32:03,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-28 13:32:03,224 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-28 13:32:03,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:03,224 INFO L225 Difference]: With dead ends: 55 [2018-11-28 13:32:03,225 INFO L226 Difference]: Without dead ends: 51 [2018-11-28 13:32:03,225 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2018-11-28 13:32:03,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-28 13:32:03,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-28 13:32:03,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-28 13:32:03,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-28 13:32:03,230 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-28 13:32:03,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:03,230 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-28 13:32:03,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-28 13:32:03,230 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-28 13:32:03,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-28 13:32:03,231 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:03,231 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:03,231 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:03,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:03,231 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-11-28 13:32:03,232 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:03,232 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:03,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:03,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:03,352 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-28 13:32:03,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:03,353 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:03,363 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-28 13:32:03,402 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-11-28 13:32:03,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:03,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:03,440 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-28 13:32:03,460 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:03,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-11-28 13:32:03,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-28 13:32:03,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-28 13:32:03,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2018-11-28 13:32:03,461 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-28 13:32:03,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:03,612 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-28 13:32:03,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-28 13:32:03,613 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-28 13:32:03,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:03,613 INFO L225 Difference]: With dead ends: 58 [2018-11-28 13:32:03,613 INFO L226 Difference]: Without dead ends: 54 [2018-11-28 13:32:03,614 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2018-11-28 13:32:03,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-28 13:32:03,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-28 13:32:03,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-28 13:32:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-28 13:32:03,617 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-28 13:32:03,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:03,617 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-28 13:32:03,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-28 13:32:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-28 13:32:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-28 13:32:03,618 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:03,618 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:03,619 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:03,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:03,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-11-28 13:32:03,619 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:03,619 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:03,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:03,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-28 13:32:03,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:03,721 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:03,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:03,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:03,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:03,764 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-28 13:32:03,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:03,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-11-28 13:32:03,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-28 13:32:03,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-28 13:32:03,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2018-11-28 13:32:03,779 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-28 13:32:03,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:03,923 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-28 13:32:03,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-28 13:32:03,923 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-28 13:32:03,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:03,924 INFO L225 Difference]: With dead ends: 61 [2018-11-28 13:32:03,924 INFO L226 Difference]: Without dead ends: 57 [2018-11-28 13:32:03,924 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2018-11-28 13:32:03,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-28 13:32:03,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-28 13:32:03,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-28 13:32:03,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-28 13:32:03,928 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-28 13:32:03,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:03,928 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-28 13:32:03,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-28 13:32:03,928 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-28 13:32:03,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-28 13:32:03,929 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:03,929 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:03,929 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:03,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:03,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-11-28 13:32:03,930 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:03,930 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:03,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:03,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:03,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:04,067 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-28 13:32:04,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:04,067 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:04,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-28 13:32:04,108 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-28 13:32:04,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:04,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:04,130 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-28 13:32:04,145 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:04,145 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-11-28 13:32:04,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-28 13:32:04,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-28 13:32:04,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2018-11-28 13:32:04,146 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-28 13:32:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:04,314 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-28 13:32:04,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-28 13:32:04,315 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-28 13:32:04,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:04,315 INFO L225 Difference]: With dead ends: 64 [2018-11-28 13:32:04,315 INFO L226 Difference]: Without dead ends: 60 [2018-11-28 13:32:04,316 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2018-11-28 13:32:04,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-28 13:32:04,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-28 13:32:04,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-28 13:32:04,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-28 13:32:04,319 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-28 13:32:04,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:04,320 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-28 13:32:04,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-28 13:32:04,320 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-28 13:32:04,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-28 13:32:04,321 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:04,321 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:04,321 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:04,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:04,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-11-28 13:32:04,321 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:04,322 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:04,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:04,326 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:04,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:04,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:04,462 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-28 13:32:04,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:04,462 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:04,469 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-28 13:32:04,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-28 13:32:04,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:04,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:04,521 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-28 13:32:04,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:04,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-11-28 13:32:04,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-28 13:32:04,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-28 13:32:04,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2018-11-28 13:32:04,541 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-11-28 13:32:04,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:04,724 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-28 13:32:04,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-28 13:32:04,725 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-11-28 13:32:04,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:04,725 INFO L225 Difference]: With dead ends: 67 [2018-11-28 13:32:04,725 INFO L226 Difference]: Without dead ends: 63 [2018-11-28 13:32:04,726 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=461, Invalid=799, Unknown=0, NotChecked=0, Total=1260 [2018-11-28 13:32:04,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-28 13:32:04,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-28 13:32:04,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-28 13:32:04,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-28 13:32:04,730 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-28 13:32:04,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:04,730 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-28 13:32:04,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-28 13:32:04,730 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-28 13:32:04,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-28 13:32:04,731 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:04,731 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:04,732 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:04,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:04,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2018-11-28 13:32:04,732 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:04,732 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:04,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:04,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:04,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:04,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:04,905 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-28 13:32:04,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:04,905 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:04,915 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-28 13:32:04,943 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-28 13:32:04,944 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:04,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:04,972 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-28 13:32:04,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:04,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-11-28 13:32:04,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-28 13:32:04,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-28 13:32:04,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-11-28 13:32:04,987 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-28 13:32:05,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:05,142 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-11-28 13:32:05,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-28 13:32:05,143 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-28 13:32:05,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:05,144 INFO L225 Difference]: With dead ends: 70 [2018-11-28 13:32:05,144 INFO L226 Difference]: Without dead ends: 66 [2018-11-28 13:32:05,144 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2018-11-28 13:32:05,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-28 13:32:05,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-28 13:32:05,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-28 13:32:05,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-28 13:32:05,148 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-11-28 13:32:05,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:05,148 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-28 13:32:05,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-28 13:32:05,148 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-28 13:32:05,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-11-28 13:32:05,149 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:05,149 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:05,149 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:05,149 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:05,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2018-11-28 13:32:05,149 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:05,149 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:05,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:05,150 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:05,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:05,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:05,311 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-28 13:32:05,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:05,311 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:05,317 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-28 13:32:05,361 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-11-28 13:32:05,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:05,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:05,379 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-28 13:32:05,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:05,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-11-28 13:32:05,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-28 13:32:05,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-28 13:32:05,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2018-11-28 13:32:05,395 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-11-28 13:32:05,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:05,570 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-11-28 13:32:05,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-28 13:32:05,570 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-11-28 13:32:05,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:05,571 INFO L225 Difference]: With dead ends: 73 [2018-11-28 13:32:05,571 INFO L226 Difference]: Without dead ends: 69 [2018-11-28 13:32:05,572 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=572, Invalid=988, Unknown=0, NotChecked=0, Total=1560 [2018-11-28 13:32:05,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-28 13:32:05,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-28 13:32:05,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-28 13:32:05,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-28 13:32:05,574 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-11-28 13:32:05,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:05,574 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-28 13:32:05,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-28 13:32:05,576 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-28 13:32:05,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-28 13:32:05,577 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:05,577 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:05,577 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:05,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:05,577 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2018-11-28 13:32:05,577 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:05,577 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:05,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:05,578 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:05,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:05,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:05,747 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-28 13:32:05,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:05,748 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:05,753 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-28 13:32:05,784 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-11-28 13:32:05,784 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 13:32:05,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:05,803 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-28 13:32:05,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:05,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-11-28 13:32:05,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-28 13:32:05,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-28 13:32:05,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2018-11-28 13:32:05,818 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-11-28 13:32:06,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:06,026 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-11-28 13:32:06,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-28 13:32:06,026 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-11-28 13:32:06,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:06,027 INFO L225 Difference]: With dead ends: 76 [2018-11-28 13:32:06,027 INFO L226 Difference]: Without dead ends: 72 [2018-11-28 13:32:06,028 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=632, Invalid=1090, Unknown=0, NotChecked=0, Total=1722 [2018-11-28 13:32:06,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-28 13:32:06,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-28 13:32:06,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-28 13:32:06,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-28 13:32:06,031 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-11-28 13:32:06,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:06,031 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-28 13:32:06,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-28 13:32:06,031 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-28 13:32:06,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-28 13:32:06,032 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:06,032 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:06,032 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:06,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:06,032 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2018-11-28 13:32:06,032 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:06,033 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:06,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:06,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 13:32:06,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:06,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:06,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-28 13:32:06,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 13:32:06,200 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 13:32:06,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:06,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 13:32:06,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 13:32:06,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-28 13:32:06,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 13:32:06,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-11-28 13:32:06,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-28 13:32:06,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-28 13:32:06,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2018-11-28 13:32:06,272 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-11-28 13:32:06,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 13:32:06,492 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-28 13:32:06,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-28 13:32:06,492 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-11-28 13:32:06,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 13:32:06,492 INFO L225 Difference]: With dead ends: 79 [2018-11-28 13:32:06,492 INFO L226 Difference]: Without dead ends: 75 [2018-11-28 13:32:06,493 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=695, Invalid=1197, Unknown=0, NotChecked=0, Total=1892 [2018-11-28 13:32:06,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-28 13:32:06,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-11-28 13:32:06,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-28 13:32:06,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-28 13:32:06,496 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-11-28 13:32:06,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 13:32:06,497 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-28 13:32:06,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-28 13:32:06,497 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-28 13:32:06,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-28 13:32:06,498 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 13:32:06,498 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 13:32:06,501 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 13:32:06,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 13:32:06,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2018-11-28 13:32:06,501 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 13:32:06,501 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 13:32:06,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:06,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 13:32:06,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 13:32:06,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 13:32:06,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 13:32:06,547 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-11-28 13:32:06,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 01:32:06 BoogieIcfgContainer [2018-11-28 13:32:06,580 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-28 13:32:06,581 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-28 13:32:06,581 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-28 13:32:06,581 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-28 13:32:06,581 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 01:32:00" (3/4) ... [2018-11-28 13:32:06,583 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-28 13:32:06,623 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_df36ad05-63b1-43d8-85b2-656642f60dba/bin-2019/uautomizer/witness.graphml [2018-11-28 13:32:06,623 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-28 13:32:06,624 INFO L168 Benchmark]: Toolchain (without parser) took 6687.08 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 366.5 MB). Free memory was 958.7 MB in the beginning and 1.1 GB in the end (delta: -164.4 MB). Peak memory consumption was 202.1 MB. Max. memory is 11.5 GB. [2018-11-28 13:32:06,625 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 985.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 13:32:06,625 INFO L168 Benchmark]: CACSL2BoogieTranslator took 131.97 ms. Allocated memory is still 1.0 GB. Free memory was 958.7 MB in the beginning and 947.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. [2018-11-28 13:32:06,625 INFO L168 Benchmark]: Boogie Procedure Inliner took 13.35 ms. Allocated memory is still 1.0 GB. Free memory is still 947.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 13:32:06,625 INFO L168 Benchmark]: Boogie Preprocessor took 12.47 ms. Allocated memory is still 1.0 GB. Free memory is still 947.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 13:32:06,626 INFO L168 Benchmark]: RCFGBuilder took 153.83 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 947.8 MB in the beginning and 1.1 GB in the end (delta: -172.2 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. [2018-11-28 13:32:06,626 INFO L168 Benchmark]: TraceAbstraction took 6329.98 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 230.7 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -3.1 MB). Peak memory consumption was 227.6 MB. Max. memory is 11.5 GB. [2018-11-28 13:32:06,626 INFO L168 Benchmark]: Witness Printer took 42.40 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 24 B). Peak memory consumption was 24 B. Max. memory is 11.5 GB. [2018-11-28 13:32:06,628 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 985.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 131.97 ms. Allocated memory is still 1.0 GB. Free memory was 958.7 MB in the beginning and 947.8 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 13.35 ms. Allocated memory is still 1.0 GB. Free memory is still 947.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 12.47 ms. Allocated memory is still 1.0 GB. Free memory is still 947.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 153.83 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 947.8 MB in the beginning and 1.1 GB in the end (delta: -172.2 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6329.98 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 230.7 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -3.1 MB). Peak memory consumption was 227.6 MB. Max. memory is 11.5 GB. * Witness Printer took 42.40 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 24 B). Peak memory consumption was 24 B. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 20; [L13] int b = 0; VAL [a=20, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=20] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=20, m=0, n=20] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=19] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=19, m=1, n=19] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=18] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=18, m=2, n=18] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=17] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=17, m=3, n=17] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=16] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=16, m=4, n=16] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=15] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=15, m=5, n=15] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=14] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=14, m=6, n=14] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=13] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=13, m=7, n=13] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=12] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=12, m=8, n=12] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=11] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=11, m=9, n=11] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=10, m=10, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=9, m=11, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=8, m=12, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=7, m=13, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=6, m=14, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=15, \old(n)=5, m=15, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=16, \old(n)=4, m=16, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=17, \old(n)=3, m=17, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=18, \old(n)=2, m=18, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=19, \old(n)=1, m=19, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=20, \old(n)=0, \result=20, m=20, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=1, m=19, n=1, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=2, m=18, n=2, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=3, m=17, n=3, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=4, m=16, n=4, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=5, m=15, n=5, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=6, m=14, n=6, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=7, m=13, n=7, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=8, m=12, n=8, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=9, m=11, n=9, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=10, m=10, n=10, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=11, m=9, n=11, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=12, m=8, n=12, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=13, m=7, n=13, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=14, m=6, n=14, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=15, m=5, n=15, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=16, m=4, n=16, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=17, m=3, n=17, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=18, m=2, n=18, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=19, m=1, n=19, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=20, m=0, n=20, sum(n - 1, m + 1)=20] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=20, b=0, sum(a, b)=20] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=20, b=0, result=20] [L16] __VERIFIER_error() VAL [a=20, b=0, result=20] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 6.2s OverallTime, 21 OverallIterations, 21 TraceHistogramMax, 2.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 243 SDtfs, 523 SDslu, 1855 SDs, 0 SdLazy, 1439 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2058 GetRequests, 1598 SyntacticMatches, 0 SemanticMatches, 460 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 2920 NumberOfCodeBlocks, 2920 NumberOfCodeBlocksAsserted, 142 NumberOfCheckSat, 2748 ConstructedInterpolants, 0 QuantifiedInterpolants, 602160 SizeOfPredicates, 228 NumberOfNonLiveVariables, 4123 ConjunctsInSsa, 456 ConjunctsInUnsatCore, 39 InterpolantComputations, 1 PerfectInterpolantSequences, 7600/15200 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...