./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 9eff01e8b41fd58fd007a4a54a96fca4ce69974c ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.23-5842f4b [2018-11-18 15:40:29,461 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 15:40:29,462 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 15:40:29,470 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 15:40:29,471 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 15:40:29,471 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 15:40:29,472 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 15:40:29,473 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 15:40:29,474 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 15:40:29,475 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 15:40:29,476 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 15:40:29,476 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 15:40:29,476 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 15:40:29,477 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 15:40:29,478 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 15:40:29,479 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 15:40:29,480 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 15:40:29,481 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 15:40:29,482 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 15:40:29,483 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 15:40:29,484 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 15:40:29,485 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 15:40:29,487 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 15:40:29,487 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 15:40:29,487 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 15:40:29,488 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 15:40:29,488 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 15:40:29,489 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 15:40:29,489 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 15:40:29,491 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 15:40:29,491 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 15:40:29,491 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 15:40:29,492 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 15:40:29,492 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 15:40:29,492 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 15:40:29,493 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 15:40:29,493 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-18 15:40:29,503 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 15:40:29,503 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 15:40:29,504 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 15:40:29,504 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-11-18 15:40:29,504 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-18 15:40:29,504 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * Use SBE=true [2018-11-18 15:40:29,505 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 15:40:29,505 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 15:40:29,506 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 15:40:29,507 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 15:40:29,507 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 15:40:29,507 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 15:40:29,507 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 15:40:29,507 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 15:40:29,507 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 15:40:29,508 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 15:40:29,508 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 15:40:29,509 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-18 15:40:29,509 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 15:40:29,509 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 15:40:29,509 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_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 -> 9eff01e8b41fd58fd007a4a54a96fca4ce69974c [2018-11-18 15:40:29,533 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 15:40:29,542 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 15:40:29,544 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 15:40:29,545 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 15:40:29,546 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 15:40:29,546 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-11-18 15:40:29,588 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/data/86382ebef/03a8727a735c4515a00917b332da60b4/FLAG8b7a106b8 [2018-11-18 15:40:29,877 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 15:40:29,877 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-11-18 15:40:29,881 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/data/86382ebef/03a8727a735c4515a00917b332da60b4/FLAG8b7a106b8 [2018-11-18 15:40:29,889 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/data/86382ebef/03a8727a735c4515a00917b332da60b4 [2018-11-18 15:40:29,891 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 15:40:29,892 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 15:40:29,892 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 15:40:29,892 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 15:40:29,895 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 15:40:29,896 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 03:40:29" (1/1) ... [2018-11-18 15:40:29,898 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4634de3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:29, skipping insertion in model container [2018-11-18 15:40:29,898 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 03:40:29" (1/1) ... [2018-11-18 15:40:29,903 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 15:40:29,914 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 15:40:30,012 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 15:40:30,014 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 15:40:30,026 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 15:40:30,036 INFO L195 MainTranslator]: Completed translation [2018-11-18 15:40:30,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30 WrapperNode [2018-11-18 15:40:30,036 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 15:40:30,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 15:40:30,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 15:40:30,037 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 15:40:30,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,045 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,092 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,092 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... [2018-11-18 15:40:30,094 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 15:40:30,095 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 15:40:30,095 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 15:40:30,095 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 15:40:30,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:30,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 15:40:30,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 15:40:30,137 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 15:40:30,137 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 15:40:30,137 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-18 15:40:30,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-18 15:40:30,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 15:40:30,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 15:40:30,139 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2018-11-18 15:40:30,304 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 15:40:30,304 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:40:30 BoogieIcfgContainer [2018-11-18 15:40:30,304 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 15:40:30,305 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 15:40:30,305 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 15:40:30,307 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 15:40:30,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 03:40:29" (1/3) ... [2018-11-18 15:40:30,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fd186fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 03:40:30, skipping insertion in model container [2018-11-18 15:40:30,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 03:40:30" (2/3) ... [2018-11-18 15:40:30,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fd186fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 03:40:30, skipping insertion in model container [2018-11-18 15:40:30,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:40:30" (3/3) ... [2018-11-18 15:40:30,310 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string_false-unreach-call_true-termination.i [2018-11-18 15:40:30,319 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 15:40:30,325 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 15:40:30,338 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 15:40:30,363 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 15:40:30,363 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 15:40:30,363 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 15:40:30,364 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 15:40:30,364 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 15:40:30,364 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 15:40:30,364 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 15:40:30,364 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 15:40:30,364 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 15:40:30,378 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2018-11-18 15:40:30,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-18 15:40:30,383 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:30,383 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:30,385 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:30,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:30,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1989464865, now seen corresponding path program 1 times [2018-11-18 15:40:30,391 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:30,392 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:30,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:30,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:30,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:30,487 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 15:40:30,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 15:40:30,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 15:40:30,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 15:40:30,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 15:40:30,500 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 2 states. [2018-11-18 15:40:30,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:30,513 INFO L93 Difference]: Finished difference Result 51 states and 62 transitions. [2018-11-18 15:40:30,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 15:40:30,514 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2018-11-18 15:40:30,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:30,519 INFO L225 Difference]: With dead ends: 51 [2018-11-18 15:40:30,519 INFO L226 Difference]: Without dead ends: 25 [2018-11-18 15:40:30,521 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 15:40:30,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-18 15:40:30,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-18 15:40:30,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-18 15:40:30,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-11-18 15:40:30,548 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 16 [2018-11-18 15:40:30,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:30,548 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-11-18 15:40:30,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 15:40:30,548 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-11-18 15:40:30,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-18 15:40:30,549 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:30,549 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:30,549 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:30,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:30,550 INFO L82 PathProgramCache]: Analyzing trace with hash 971272842, now seen corresponding path program 1 times [2018-11-18 15:40:30,550 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:30,550 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:30,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:30,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:30,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:30,638 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 15:40:30,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 15:40:30,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 15:40:30,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 15:40:30,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-11-18 15:40:30,640 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2018-11-18 15:40:30,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:30,694 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2018-11-18 15:40:30,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 15:40:30,694 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-11-18 15:40:30,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:30,695 INFO L225 Difference]: With dead ends: 42 [2018-11-18 15:40:30,695 INFO L226 Difference]: Without dead ends: 28 [2018-11-18 15:40:30,696 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-11-18 15:40:30,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-18 15:40:30,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-11-18 15:40:30,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-18 15:40:30,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-11-18 15:40:30,700 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 18 [2018-11-18 15:40:30,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:30,700 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-11-18 15:40:30,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 15:40:30,701 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-11-18 15:40:30,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-18 15:40:30,701 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:30,701 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:30,702 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:30,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:30,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1585722772, now seen corresponding path program 1 times [2018-11-18 15:40:30,702 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:30,702 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:30,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,703 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:30,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:30,775 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:30,776 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 15:40:30,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 15:40:30,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 15:40:30,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 15:40:30,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 15:40:30,777 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 5 states. [2018-11-18 15:40:30,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:30,823 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-11-18 15:40:30,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 15:40:30,823 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-11-18 15:40:30,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:30,825 INFO L225 Difference]: With dead ends: 53 [2018-11-18 15:40:30,825 INFO L226 Difference]: Without dead ends: 35 [2018-11-18 15:40:30,826 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-11-18 15:40:30,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-11-18 15:40:30,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2018-11-18 15:40:30,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-18 15:40:30,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-11-18 15:40:30,831 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2018-11-18 15:40:30,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:30,831 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-11-18 15:40:30,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 15:40:30,831 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-11-18 15:40:30,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-18 15:40:30,832 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:30,832 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:30,832 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:30,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:30,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1045245671, now seen corresponding path program 1 times [2018-11-18 15:40:30,832 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:30,832 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:30,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:30,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:30,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:31,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 15:40:31,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:40:31,154 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:31,169 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:31,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:31,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:40:31,226 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-11-18 15:40:31,227 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,233 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,233 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2018-11-18 15:40:31,350 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-11-18 15:40:31,352 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-11-18 15:40:31,352 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,354 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,361 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,361 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:32, output treesize:28 [2018-11-18 15:40:31,411 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2018-11-18 15:40:31,415 INFO L682 Elim1Store]: detected equality via solver [2018-11-18 15:40:31,415 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2018-11-18 15:40:31,416 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,424 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-11-18 15:40:31,425 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,426 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,431 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:31,431 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:38, output treesize:3 [2018-11-18 15:40:31,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:31,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 15:40:31,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 18 [2018-11-18 15:40:31,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 15:40:31,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 15:40:31,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2018-11-18 15:40:31,474 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 18 states. [2018-11-18 15:40:31,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:31,888 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2018-11-18 15:40:31,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 15:40:31,889 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2018-11-18 15:40:31,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:31,890 INFO L225 Difference]: With dead ends: 70 [2018-11-18 15:40:31,890 INFO L226 Difference]: Without dead ends: 68 [2018-11-18 15:40:31,891 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=593, Unknown=0, NotChecked=0, Total=756 [2018-11-18 15:40:31,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-11-18 15:40:31,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 49. [2018-11-18 15:40:31,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-18 15:40:31,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2018-11-18 15:40:31,898 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 24 [2018-11-18 15:40:31,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:31,898 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2018-11-18 15:40:31,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 15:40:31,899 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2018-11-18 15:40:31,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-11-18 15:40:31,899 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:31,900 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:31,900 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:31,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:31,900 INFO L82 PathProgramCache]: Analyzing trace with hash 260616490, now seen corresponding path program 2 times [2018-11-18 15:40:31,900 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:31,900 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:31,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:31,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:31,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:31,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:32,202 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:32,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:40:32,202 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:32,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 15:40:32,236 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 15:40:32,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:40:32,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:40:32,252 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-11-18 15:40:32,252 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,255 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,255 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2018-11-18 15:40:32,326 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2018-11-18 15:40:32,328 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-11-18 15:40:32,328 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,331 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,337 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,338 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2018-11-18 15:40:32,421 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2018-11-18 15:40:32,423 INFO L682 Elim1Store]: detected equality via solver [2018-11-18 15:40:32,423 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2018-11-18 15:40:32,424 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,428 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-11-18 15:40:32,429 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,430 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,433 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:32,433 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:36, output treesize:3 [2018-11-18 15:40:32,442 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 15:40:32,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 15:40:32,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 23 [2018-11-18 15:40:32,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-18 15:40:32,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-18 15:40:32,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2018-11-18 15:40:32,458 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 23 states. [2018-11-18 15:40:32,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:32,971 INFO L93 Difference]: Finished difference Result 115 states and 127 transitions. [2018-11-18 15:40:32,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-18 15:40:32,972 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2018-11-18 15:40:32,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:32,974 INFO L225 Difference]: With dead ends: 115 [2018-11-18 15:40:32,974 INFO L226 Difference]: Without dead ends: 96 [2018-11-18 15:40:32,975 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=176, Invalid=946, Unknown=0, NotChecked=0, Total=1122 [2018-11-18 15:40:32,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-11-18 15:40:32,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 52. [2018-11-18 15:40:32,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-18 15:40:32,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2018-11-18 15:40:32,982 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 30 [2018-11-18 15:40:32,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:32,982 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2018-11-18 15:40:32,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-18 15:40:32,983 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2018-11-18 15:40:32,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-18 15:40:32,983 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:32,983 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:32,984 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:32,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:32,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1011030201, now seen corresponding path program 1 times [2018-11-18 15:40:32,984 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:32,984 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:32,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:32,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:40:32,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:32,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:33,031 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 15:40:33,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:40:33,032 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:33,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:33,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:40:33,089 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 15:40:33,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 15:40:33,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2018-11-18 15:40:33,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 15:40:33,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 15:40:33,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2018-11-18 15:40:33,114 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 11 states. [2018-11-18 15:40:33,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:33,199 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2018-11-18 15:40:33,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 15:40:33,199 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2018-11-18 15:40:33,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:33,200 INFO L225 Difference]: With dead ends: 82 [2018-11-18 15:40:33,200 INFO L226 Difference]: Without dead ends: 57 [2018-11-18 15:40:33,200 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-18 15:40:33,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-18 15:40:33,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 46. [2018-11-18 15:40:33,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-18 15:40:33,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-11-18 15:40:33,206 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 33 [2018-11-18 15:40:33,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:33,206 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-11-18 15:40:33,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 15:40:33,206 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-11-18 15:40:33,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-18 15:40:33,207 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:33,207 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:33,207 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:33,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:33,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1439664076, now seen corresponding path program 3 times [2018-11-18 15:40:33,207 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:33,207 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:33,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:33,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 15:40:33,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:33,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:33,260 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:33,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:40:33,260 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:33,279 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 15:40:33,297 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 15:40:33,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:40:33,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:40:33,302 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 15:40:33,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 15:40:33,317 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-11-18 15:40:33,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 15:40:33,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 15:40:33,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-18 15:40:33,318 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 8 states. [2018-11-18 15:40:33,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:33,428 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2018-11-18 15:40:33,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 15:40:33,429 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2018-11-18 15:40:33,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:33,430 INFO L225 Difference]: With dead ends: 102 [2018-11-18 15:40:33,430 INFO L226 Difference]: Without dead ends: 87 [2018-11-18 15:40:33,431 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-11-18 15:40:33,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-18 15:40:33,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 58. [2018-11-18 15:40:33,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-11-18 15:40:33,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2018-11-18 15:40:33,437 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 33 [2018-11-18 15:40:33,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:33,437 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2018-11-18 15:40:33,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 15:40:33,437 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2018-11-18 15:40:33,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-11-18 15:40:33,438 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:33,438 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:33,438 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:33,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:33,438 INFO L82 PathProgramCache]: Analyzing trace with hash 144640967, now seen corresponding path program 4 times [2018-11-18 15:40:33,438 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:33,438 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:33,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:33,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:40:33,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:33,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 15:40:33,756 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-18 15:40:33,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 15:40:33,756 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/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 [2018-11-18 15:40:33,762 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 15:40:33,773 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 15:40:33,773 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 15:40:33,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 15:40:33,822 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 30 [2018-11-18 15:40:33,825 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2018-11-18 15:40:33,825 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,831 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,834 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,835 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2018-11-18 15:40:33,880 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 39 [2018-11-18 15:40:33,883 INFO L700 Elim1Store]: detected not equals via solver [2018-11-18 15:40:33,884 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 39 [2018-11-18 15:40:33,884 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,894 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,898 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:33,899 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2018-11-18 15:40:33,995 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 39 [2018-11-18 15:40:33,999 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 30 [2018-11-18 15:40:34,000 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:34,016 INFO L700 Elim1Store]: detected not equals via solver [2018-11-18 15:40:34,016 INFO L700 Elim1Store]: detected not equals via solver [2018-11-18 15:40:34,017 INFO L682 Elim1Store]: detected equality via solver [2018-11-18 15:40:34,017 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 31 [2018-11-18 15:40:34,018 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:34,028 INFO L700 Elim1Store]: detected not equals via solver [2018-11-18 15:40:34,029 INFO L700 Elim1Store]: detected not equals via solver [2018-11-18 15:40:34,029 INFO L682 Elim1Store]: detected equality via solver [2018-11-18 15:40:34,030 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2018-11-18 15:40:34,030 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-11-18 15:40:34,035 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:34,039 INFO L267 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-18 15:40:34,039 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:49, output treesize:3 [2018-11-18 15:40:34,064 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 15:40:34,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 15:40:34,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14] total 29 [2018-11-18 15:40:34,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-18 15:40:34,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-18 15:40:34,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=726, Unknown=0, NotChecked=0, Total=812 [2018-11-18 15:40:34,080 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 29 states. [2018-11-18 15:40:35,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 15:40:35,318 INFO L93 Difference]: Finished difference Result 88 states and 96 transitions. [2018-11-18 15:40:35,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-18 15:40:35,318 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2018-11-18 15:40:35,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 15:40:35,319 INFO L225 Difference]: With dead ends: 88 [2018-11-18 15:40:35,319 INFO L226 Difference]: Without dead ends: 86 [2018-11-18 15:40:35,320 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=533, Invalid=2659, Unknown=0, NotChecked=0, Total=3192 [2018-11-18 15:40:35,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-11-18 15:40:35,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 54. [2018-11-18 15:40:35,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-18 15:40:35,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2018-11-18 15:40:35,331 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 36 [2018-11-18 15:40:35,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 15:40:35,332 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2018-11-18 15:40:35,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-18 15:40:35,332 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2018-11-18 15:40:35,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-18 15:40:35,332 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 15:40:35,333 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 15:40:35,333 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 15:40:35,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 15:40:35,333 INFO L82 PathProgramCache]: Analyzing trace with hash -669879850, now seen corresponding path program 2 times [2018-11-18 15:40:35,333 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 15:40:35,333 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 15:40:35,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:35,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 15:40:35,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 15:40:35,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 15:40:35,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 15:40:35,378 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 15:40:35,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 03:40:35 BoogieIcfgContainer [2018-11-18 15:40:35,405 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 15:40:35,405 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 15:40:35,405 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 15:40:35,406 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 15:40:35,406 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 03:40:30" (3/4) ... [2018-11-18 15:40:35,408 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 15:40:35,449 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_3f126d0a-cd4c-47f6-ab10-5d55da8d0730/bin-2019/uautomizer/witness.graphml [2018-11-18 15:40:35,449 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 15:40:35,449 INFO L168 Benchmark]: Toolchain (without parser) took 5558.37 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 306.2 MB). Free memory was 959.8 MB in the beginning and 852.4 MB in the end (delta: 107.4 MB). Peak memory consumption was 413.6 MB. Max. memory is 11.5 GB. [2018-11-18 15:40:35,450 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 15:40:35,451 INFO L168 Benchmark]: CACSL2BoogieTranslator took 144.25 ms. Allocated memory is still 1.0 GB. Free memory was 959.8 MB in the beginning and 949.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 15:40:35,451 INFO L168 Benchmark]: Boogie Preprocessor took 57.80 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 144.2 MB). Free memory was 949.1 MB in the beginning and 1.1 GB in the end (delta: -193.4 MB). Peak memory consumption was 16.7 MB. Max. memory is 11.5 GB. [2018-11-18 15:40:35,451 INFO L168 Benchmark]: RCFGBuilder took 209.62 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 28.3 MB). Peak memory consumption was 28.3 MB. Max. memory is 11.5 GB. [2018-11-18 15:40:35,452 INFO L168 Benchmark]: TraceAbstraction took 5100.48 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 162.0 MB). Free memory was 1.1 GB in the beginning and 852.4 MB in the end (delta: 261.9 MB). Peak memory consumption was 423.9 MB. Max. memory is 11.5 GB. [2018-11-18 15:40:35,452 INFO L168 Benchmark]: Witness Printer took 43.49 ms. Allocated memory is still 1.3 GB. Free memory is still 852.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 15:40:35,453 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 985.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 144.25 ms. Allocated memory is still 1.0 GB. Free memory was 959.8 MB in the beginning and 949.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 57.80 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 144.2 MB). Free memory was 949.1 MB in the beginning and 1.1 GB in the end (delta: -193.4 MB). Peak memory consumption was 16.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 209.62 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 28.3 MB). Peak memory consumption was 28.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5100.48 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 162.0 MB). Free memory was 1.1 GB in the beginning and 852.4 MB in the end (delta: 261.9 MB). Peak memory consumption was 423.9 MB. Max. memory is 11.5 GB. * Witness Printer took 43.49 ms. Allocated memory is still 1.3 GB. Free memory is still 852.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] int MAX = __VERIFIER_nondet_uint(); [L14] FCALL char str1[MAX], str2[MAX]; [L15] int cont, i, j; [L16] cont = 0 [L18] i=0 VAL [cont=0, i=0, MAX=2, str1={4:0}, str2={5:0}] [L18] COND TRUE i= 0 [L26] EXPR, FCALL str1[0] [L26] FCALL str2[j] = str1[0] [L27] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={4:0}, str2={5:0}] [L25] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L25] COND TRUE i >= 0 [L26] EXPR, FCALL str1[0] [L26] FCALL str2[j] = str1[0] [L27] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={4:0}, str2={5:0}] [L25] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={5:0}] [L25] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={5:0}] [L30] j = MAX-1 [L31] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L31] COND TRUE i