./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cad46833 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/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 4335483d0b28de4d854f33f949d3555a767d1bde ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.24-cad4683 [2019-10-22 09:01:10,272 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 09:01:10,274 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 09:01:10,283 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 09:01:10,283 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 09:01:10,284 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 09:01:10,285 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 09:01:10,287 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 09:01:10,288 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 09:01:10,289 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 09:01:10,290 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 09:01:10,298 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 09:01:10,299 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 09:01:10,300 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 09:01:10,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 09:01:10,301 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 09:01:10,302 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 09:01:10,303 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 09:01:10,304 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 09:01:10,305 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 09:01:10,306 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 09:01:10,307 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 09:01:10,308 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 09:01:10,309 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 09:01:10,315 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 09:01:10,316 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 09:01:10,316 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 09:01:10,317 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 09:01:10,317 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 09:01:10,318 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 09:01:10,318 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 09:01:10,318 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 09:01:10,319 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 09:01:10,320 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 09:01:10,320 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 09:01:10,320 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 09:01:10,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 09:01:10,321 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 09:01:10,323 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 09:01:10,324 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 09:01:10,327 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 09:01:10,329 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-22 09:01:10,344 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 09:01:10,346 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 09:01:10,348 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-22 09:01:10,348 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-22 09:01:10,348 INFO L138 SettingsManager]: * Use SBE=true [2019-10-22 09:01:10,348 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 09:01:10,349 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-22 09:01:10,349 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-22 09:01:10,349 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-22 09:01:10,349 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 09:01:10,349 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-22 09:01:10,350 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-22 09:01:10,350 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-22 09:01:10,350 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-22 09:01:10,350 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 09:01:10,350 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-22 09:01:10,351 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-22 09:01:10,351 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 09:01:10,351 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 09:01:10,351 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-22 09:01:10,351 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-22 09:01:10,351 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-22 09:01:10,352 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 09:01:10,352 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-22 09:01:10,352 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-22 09:01:10,352 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-22 09:01:10,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-22 09:01:10,353 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-22 09:01:10,353 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/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 -> 4335483d0b28de4d854f33f949d3555a767d1bde [2019-10-22 09:01:10,390 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 09:01:10,402 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 09:01:10,406 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 09:01:10,408 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 09:01:10,408 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 09:01:10,409 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/../../sv-benchmarks/c/loops/invert_string-1.c [2019-10-22 09:01:10,459 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/data/751035d81/6ebca0ae01f74e2a907fdb477b9b0f30/FLAG965d718ca [2019-10-22 09:01:10,833 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 09:01:10,834 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/sv-benchmarks/c/loops/invert_string-1.c [2019-10-22 09:01:10,841 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/data/751035d81/6ebca0ae01f74e2a907fdb477b9b0f30/FLAG965d718ca [2019-10-22 09:01:10,856 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/data/751035d81/6ebca0ae01f74e2a907fdb477b9b0f30 [2019-10-22 09:01:10,859 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 09:01:10,860 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 09:01:10,861 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 09:01:10,861 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 09:01:10,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 09:01:10,865 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:01:10" (1/1) ... [2019-10-22 09:01:10,868 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19ec2182 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:10, skipping insertion in model container [2019-10-22 09:01:10,868 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:01:10" (1/1) ... [2019-10-22 09:01:10,875 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 09:01:10,896 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 09:01:11,082 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 09:01:11,087 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 09:01:11,237 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 09:01:11,260 INFO L192 MainTranslator]: Completed translation [2019-10-22 09:01:11,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11 WrapperNode [2019-10-22 09:01:11,261 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 09:01:11,262 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 09:01:11,262 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 09:01:11,262 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 09:01:11,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,283 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,320 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 09:01:11,320 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 09:01:11,321 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 09:01:11,321 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 09:01:11,332 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,333 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,335 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,336 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,341 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,350 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,356 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... [2019-10-22 09:01:11,363 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 09:01:11,364 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 09:01:11,364 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 09:01:11,364 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 09:01:11,365 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/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 [2019-10-22 09:01:11,440 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-22 09:01:11,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 09:01:11,441 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 09:01:11,441 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-22 09:01:11,442 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-22 09:01:11,442 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-22 09:01:11,693 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 09:01:11,694 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-10-22 09:01:11,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:01:11 BoogieIcfgContainer [2019-10-22 09:01:11,695 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 09:01:11,696 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-22 09:01:11,696 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-22 09:01:11,699 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-22 09:01:11,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 09:01:10" (1/3) ... [2019-10-22 09:01:11,700 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3879bb7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:01:11, skipping insertion in model container [2019-10-22 09:01:11,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:01:11" (2/3) ... [2019-10-22 09:01:11,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3879bb7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:01:11, skipping insertion in model container [2019-10-22 09:01:11,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:01:11" (3/3) ... [2019-10-22 09:01:11,703 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2019-10-22 09:01:11,712 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-22 09:01:11,719 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-22 09:01:11,729 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-22 09:01:11,751 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-22 09:01:11,751 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-22 09:01:11,751 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-22 09:01:11,751 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 09:01:11,752 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 09:01:11,752 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-22 09:01:11,752 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 09:01:11,752 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-22 09:01:11,765 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-10-22 09:01:11,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-10-22 09:01:11,770 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:11,771 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:11,773 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:11,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:11,778 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2019-10-22 09:01:11,792 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:11,798 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249489767] [2019-10-22 09:01:11,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:11,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:11,799 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:11,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:11,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:11,949 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249489767] [2019-10-22 09:01:11,950 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 09:01:11,950 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-22 09:01:11,950 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018604011] [2019-10-22 09:01:11,954 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-22 09:01:11,955 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:11,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-22 09:01:11,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-22 09:01:11,971 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 4 states. [2019-10-22 09:01:12,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:12,040 INFO L93 Difference]: Finished difference Result 33 states and 45 transitions. [2019-10-22 09:01:12,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-22 09:01:12,042 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2019-10-22 09:01:12,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:12,052 INFO L225 Difference]: With dead ends: 33 [2019-10-22 09:01:12,053 INFO L226 Difference]: Without dead ends: 15 [2019-10-22 09:01:12,056 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-10-22 09:01:12,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-22 09:01:12,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-22 09:01:12,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-22 09:01:12,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-10-22 09:01:12,093 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2019-10-22 09:01:12,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:12,094 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-10-22 09:01:12,094 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-22 09:01:12,094 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-10-22 09:01:12,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-22 09:01:12,095 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:12,095 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:12,095 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:12,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:12,096 INFO L82 PathProgramCache]: Analyzing trace with hash 867342291, now seen corresponding path program 1 times [2019-10-22 09:01:12,096 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:12,096 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009178447] [2019-10-22 09:01:12,096 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:12,097 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:12,097 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:12,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:12,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 09:01:12,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009178447] [2019-10-22 09:01:12,149 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 09:01:12,150 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-22 09:01:12,150 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559782917] [2019-10-22 09:01:12,151 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-22 09:01:12,152 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:12,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-22 09:01:12,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-22 09:01:12,152 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2019-10-22 09:01:12,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:12,181 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-10-22 09:01:12,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-22 09:01:12,181 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-10-22 09:01:12,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:12,182 INFO L225 Difference]: With dead ends: 28 [2019-10-22 09:01:12,182 INFO L226 Difference]: Without dead ends: 17 [2019-10-22 09:01:12,183 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-22 09:01:12,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-22 09:01:12,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-10-22 09:01:12,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-22 09:01:12,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-10-22 09:01:12,187 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2019-10-22 09:01:12,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:12,187 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-10-22 09:01:12,187 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-22 09:01:12,188 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-10-22 09:01:12,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-22 09:01:12,188 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:12,188 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:12,189 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:12,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:12,189 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2019-10-22 09:01:12,189 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:12,189 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268363474] [2019-10-22 09:01:12,190 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:12,190 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:12,190 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:12,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:12,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:12,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268363474] [2019-10-22 09:01:12,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849657497] [2019-10-22 09:01:12,705 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:12,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:12,765 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-22 09:01:12,771 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 09:01:12,833 INFO L375 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-10-22 09:01:12,837 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:12,845 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:12,846 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:12,846 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-10-22 09:01:12,954 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2019-10-22 09:01:12,955 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:12,967 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:12,967 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:12,968 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:25 [2019-10-22 09:01:13,033 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 09:01:13,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:13,060 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 09:01:13,060 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-10-22 09:01:13,060 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429236753] [2019-10-22 09:01:13,061 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-22 09:01:13,061 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:13,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-22 09:01:13,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2019-10-22 09:01:13,062 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 16 states. [2019-10-22 09:01:13,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:13,898 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-10-22 09:01:13,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-22 09:01:13,899 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 13 [2019-10-22 09:01:13,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:13,900 INFO L225 Difference]: With dead ends: 38 [2019-10-22 09:01:13,900 INFO L226 Difference]: Without dead ends: 36 [2019-10-22 09:01:13,901 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=554, Unknown=0, NotChecked=0, Total=756 [2019-10-22 09:01:13,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-22 09:01:13,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2019-10-22 09:01:13,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-22 09:01:13,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-10-22 09:01:13,908 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 13 [2019-10-22 09:01:13,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:13,908 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-10-22 09:01:13,909 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-22 09:01:13,909 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-10-22 09:01:13,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-22 09:01:13,909 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:13,909 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:14,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:14,110 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:14,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:14,111 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2019-10-22 09:01:14,111 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:14,111 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477083004] [2019-10-22 09:01:14,111 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:14,112 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:14,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:14,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:14,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:14,204 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477083004] [2019-10-22 09:01:14,204 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120336209] [2019-10-22 09:01:14,204 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:14,252 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 09:01:14,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 09:01:14,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-22 09:01:14,255 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 09:01:14,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:14,263 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 09:01:14,263 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-10-22 09:01:14,264 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787530106] [2019-10-22 09:01:14,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-22 09:01:14,265 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:14,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-22 09:01:14,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-22 09:01:14,266 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states. [2019-10-22 09:01:14,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:14,415 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2019-10-22 09:01:14,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-22 09:01:14,416 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-10-22 09:01:14,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:14,417 INFO L225 Difference]: With dead ends: 43 [2019-10-22 09:01:14,417 INFO L226 Difference]: Without dead ends: 36 [2019-10-22 09:01:14,417 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-22 09:01:14,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-22 09:01:14,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2019-10-22 09:01:14,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-22 09:01:14,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-10-22 09:01:14,429 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2019-10-22 09:01:14,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:14,429 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-10-22 09:01:14,429 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-22 09:01:14,430 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-10-22 09:01:14,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-22 09:01:14,430 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:14,430 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:14,631 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:14,631 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:14,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:14,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1786824679, now seen corresponding path program 1 times [2019-10-22 09:01:14,632 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:14,632 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949853791] [2019-10-22 09:01:14,632 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:14,632 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:14,633 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:14,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:14,727 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 09:01:14,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949853791] [2019-10-22 09:01:14,728 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228320085] [2019-10-22 09:01:14,728 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:14,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:14,778 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-22 09:01:14,780 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 09:01:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 09:01:14,842 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 09:01:14,842 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2019-10-22 09:01:14,843 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251334744] [2019-10-22 09:01:14,843 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-22 09:01:14,843 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:14,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-22 09:01:14,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-10-22 09:01:14,844 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 11 states. [2019-10-22 09:01:14,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:14,993 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2019-10-22 09:01:14,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-22 09:01:14,993 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-10-22 09:01:14,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:14,994 INFO L225 Difference]: With dead ends: 50 [2019-10-22 09:01:14,995 INFO L226 Difference]: Without dead ends: 34 [2019-10-22 09:01:14,995 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2019-10-22 09:01:14,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-22 09:01:15,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 20. [2019-10-22 09:01:15,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-22 09:01:15,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-22 09:01:15,001 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2019-10-22 09:01:15,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:15,002 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-22 09:01:15,002 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-22 09:01:15,002 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-22 09:01:15,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-22 09:01:15,002 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:15,003 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:15,203 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:15,204 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:15,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:15,204 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 3 times [2019-10-22 09:01:15,204 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:15,204 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319654762] [2019-10-22 09:01:15,205 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:15,205 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:15,205 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:15,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:15,805 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:15,806 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319654762] [2019-10-22 09:01:15,806 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861181821] [2019-10-22 09:01:15,806 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:15,843 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-22 09:01:15,843 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 09:01:15,845 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-22 09:01:15,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 09:01:15,853 INFO L375 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-10-22 09:01:15,853 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:15,860 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:15,861 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:15,861 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-10-22 09:01:16,031 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2019-10-22 09:01:16,032 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:16,038 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:16,038 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:16,039 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2019-10-22 09:01:16,113 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 09:01:16,152 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:16,152 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 09:01:16,152 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2019-10-22 09:01:16,153 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931452060] [2019-10-22 09:01:16,153 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-22 09:01:16,153 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:16,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-22 09:01:16,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2019-10-22 09:01:16,156 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 22 states. [2019-10-22 09:01:17,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:17,148 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2019-10-22 09:01:17,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-22 09:01:17,148 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 17 [2019-10-22 09:01:17,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:17,149 INFO L225 Difference]: With dead ends: 50 [2019-10-22 09:01:17,149 INFO L226 Difference]: Without dead ends: 48 [2019-10-22 09:01:17,150 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=336, Invalid=1224, Unknown=0, NotChecked=0, Total=1560 [2019-10-22 09:01:17,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-22 09:01:17,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 31. [2019-10-22 09:01:17,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-22 09:01:17,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-10-22 09:01:17,156 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 17 [2019-10-22 09:01:17,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:17,156 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-10-22 09:01:17,156 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-22 09:01:17,156 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-10-22 09:01:17,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-22 09:01:17,157 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:17,157 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:17,357 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:17,358 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:17,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:17,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1927655819, now seen corresponding path program 4 times [2019-10-22 09:01:17,358 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:17,359 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393984821] [2019-10-22 09:01:17,359 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:17,359 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:17,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:17,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 09:01:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 09:01:17,440 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393984821] [2019-10-22 09:01:17,440 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619004597] [2019-10-22 09:01:17,440 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:17,471 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-22 09:01:17,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 09:01:17,472 WARN L254 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-22 09:01:17,473 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 09:01:17,494 INFO L341 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2019-10-22 09:01:17,495 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2019-10-22 09:01:17,495 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:17,499 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:17,500 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:17,500 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:20 [2019-10-22 09:01:17,550 INFO L341 Elim1Store]: treesize reduction 60, result has 20.0 percent of original size [2019-10-22 09:01:17,550 INFO L375 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 29 treesize of output 27 [2019-10-22 09:01:17,551 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-22 09:01:17,557 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-22 09:01:17,557 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-22 09:01:17,558 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:37, output treesize:35 [2019-10-22 09:01:17,628 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 09:01:17,645 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-22 09:01:17,646 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 09:01:17,646 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-10-22 09:01:17,646 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227658930] [2019-10-22 09:01:17,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-22 09:01:17,646 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 09:01:17,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-22 09:01:17,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2019-10-22 09:01:17,647 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 15 states. [2019-10-22 09:01:18,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 09:01:18,391 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2019-10-22 09:01:18,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-22 09:01:18,392 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 19 [2019-10-22 09:01:18,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 09:01:18,393 INFO L225 Difference]: With dead ends: 77 [2019-10-22 09:01:18,393 INFO L226 Difference]: Without dead ends: 67 [2019-10-22 09:01:18,393 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2019-10-22 09:01:18,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-22 09:01:18,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 42. [2019-10-22 09:01:18,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-22 09:01:18,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2019-10-22 09:01:18,400 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 19 [2019-10-22 09:01:18,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 09:01:18,401 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2019-10-22 09:01:18,401 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-22 09:01:18,401 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2019-10-22 09:01:18,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-22 09:01:18,401 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 09:01:18,401 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 09:01:18,602 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 09:01:18,602 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 09:01:18,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 09:01:18,603 INFO L82 PathProgramCache]: Analyzing trace with hash 980237987, now seen corresponding path program 2 times [2019-10-22 09:01:18,603 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 09:01:18,603 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370460704] [2019-10-22 09:01:18,603 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:18,603 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 09:01:18,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 09:01:18,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 09:01:18,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 09:01:18,663 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 09:01:18,663 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-22 09:01:18,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 09:01:18 BoogieIcfgContainer [2019-10-22 09:01:18,690 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-22 09:01:18,690 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-10-22 09:01:18,690 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-10-22 09:01:18,691 INFO L275 PluginConnector]: Witness Printer initialized [2019-10-22 09:01:18,691 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:01:11" (3/4) ... [2019-10-22 09:01:18,693 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-10-22 09:01:18,736 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_f9077584-9688-4bcb-b05c-bfa0d3463cd9/bin/uautomizer/witness.graphml [2019-10-22 09:01:18,737 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-10-22 09:01:18,738 INFO L168 Benchmark]: Toolchain (without parser) took 7878.14 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 303.6 MB). Free memory was 943.1 MB in the beginning and 1.2 GB in the end (delta: -249.5 MB). Peak memory consumption was 54.1 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,738 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 966.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 09:01:18,738 INFO L168 Benchmark]: CACSL2BoogieTranslator took 400.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.3 MB). Free memory was 943.1 MB in the beginning and 1.2 GB in the end (delta: -213.1 MB). Peak memory consumption was 20.5 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,739 INFO L168 Benchmark]: Boogie Procedure Inliner took 58.41 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 3.6 MB). Peak memory consumption was 3.6 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,739 INFO L168 Benchmark]: Boogie Preprocessor took 43.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 1.8 MB). Peak memory consumption was 1.8 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,739 INFO L168 Benchmark]: RCFGBuilder took 331.42 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: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,740 INFO L168 Benchmark]: TraceAbstraction took 6993.98 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 146.3 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -71.8 MB). Peak memory consumption was 74.5 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,740 INFO L168 Benchmark]: Witness Printer took 46.30 ms. Allocated memory is still 1.3 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 11.5 GB. [2019-10-22 09:01:18,742 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 966.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 400.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.3 MB). Free memory was 943.1 MB in the beginning and 1.2 GB in the end (delta: -213.1 MB). Peak memory consumption was 20.5 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 58.41 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 3.6 MB). Peak memory consumption was 3.6 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 43.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 1.8 MB). Peak memory consumption was 1.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 331.42 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: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6993.98 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 146.3 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -71.8 MB). Peak memory consumption was 74.5 MB. Max. memory is 11.5 GB. * Witness Printer took 46.30 ms. Allocated memory is still 1.3 GB. Free memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i