./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loops/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_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 77cd31699320cd40da64f32a92959020d19291bd .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 77cd31699320cd40da64f32a92959020d19291bd ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 11:17:44,297 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 11:17:44,299 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 11:17:44,311 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 11:17:44,313 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 11:17:44,314 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 11:17:44,314 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 11:17:44,316 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 11:17:44,318 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 11:17:44,318 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 11:17:44,319 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 11:17:44,319 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 11:17:44,320 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 11:17:44,320 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 11:17:44,336 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 11:17:44,336 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 11:17:44,337 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 11:17:44,338 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 11:17:44,340 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 11:17:44,341 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 11:17:44,342 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 11:17:44,343 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 11:17:44,355 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 11:17:44,355 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 11:17:44,355 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 11:17:44,356 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 11:17:44,357 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 11:17:44,360 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 11:17:44,361 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 11:17:44,362 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 11:17:44,362 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 11:17:44,363 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 11:17:44,363 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 11:17:44,363 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 11:17:44,364 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 11:17:44,364 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 11:17:44,364 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf [2018-11-18 11:17:44,379 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 11:17:44,379 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 11:17:44,380 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 11:17:44,380 INFO L133 SettingsManager]: * Process only entry and re-entry procedures=false [2018-11-18 11:17:44,381 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-18 11:17:44,381 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-18 11:17:44,381 INFO L133 SettingsManager]: * Use SBE=true [2018-11-18 11:17:44,381 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 11:17:44,381 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 11:17:44,381 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 11:17:44,381 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 11:17:44,382 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 11:17:44,383 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 11:17:44,383 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 11:17:44,383 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 11:17:44,384 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-18 11:17:44,384 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 11:17:44,384 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 11:17:44,384 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_0ca6624e-6691-4b62-9445-48f4795cb089/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 -> 77cd31699320cd40da64f32a92959020d19291bd [2018-11-18 11:17:44,436 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 11:17:44,453 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 11:17:44,455 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 11:17:44,464 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 11:17:44,464 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 11:17:44,465 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-11-18 11:17:44,524 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/b776ce87b/dae451f412964c298aaf8891a6cf92ff/FLAGb4a8d428f [2018-11-18 11:17:44,913 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 11:17:44,913 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-11-18 11:17:44,920 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/b776ce87b/dae451f412964c298aaf8891a6cf92ff/FLAGb4a8d428f [2018-11-18 11:17:44,933 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/b776ce87b/dae451f412964c298aaf8891a6cf92ff [2018-11-18 11:17:44,936 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 11:17:44,937 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 11:17:44,938 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 11:17:44,938 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 11:17:44,942 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 11:17:44,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 11:17:44" (1/1) ... [2018-11-18 11:17:44,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25c31600 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:44, skipping insertion in model container [2018-11-18 11:17:44,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 11:17:44" (1/1) ... [2018-11-18 11:17:44,954 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 11:17:44,973 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 11:17:45,136 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 11:17:45,139 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 11:17:45,159 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 11:17:45,180 INFO L195 MainTranslator]: Completed translation [2018-11-18 11:17:45,180 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45 WrapperNode [2018-11-18 11:17:45,180 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 11:17:45,181 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 11:17:45,181 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 11:17:45,181 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 11:17:45,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,201 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,201 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,209 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,214 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,215 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... [2018-11-18 11:17:45,218 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 11:17:45,219 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 11:17:45,219 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 11:17:45,219 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 11:17:45,219 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 11:17:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 11:17:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 11:17:45,371 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 11:17:45,371 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 11:17:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2018-11-18 11:17:45,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 11:17:45,380 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-11-18 11:17:45,380 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 11:17:45,380 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-18 11:17:45,380 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-18 11:17:45,381 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-18 11:17:45,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-18 11:17:45,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 11:17:45,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 11:17:45,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2018-11-18 11:17:45,942 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 11:17:45,943 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:45 BoogieIcfgContainer [2018-11-18 11:17:45,943 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 11:17:45,944 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 11:17:45,944 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 11:17:45,947 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 11:17:45,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 11:17:44" (1/3) ... [2018-11-18 11:17:45,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cfd1f8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 11:17:45, skipping insertion in model container [2018-11-18 11:17:45,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:45" (2/3) ... [2018-11-18 11:17:45,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cfd1f8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 11:17:45, skipping insertion in model container [2018-11-18 11:17:45,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:45" (3/3) ... [2018-11-18 11:17:45,950 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-11-18 11:17:45,959 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 11:17:45,980 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 11:17:46,014 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 11:17:46,069 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 11:17:46,080 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 11:17:46,080 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 11:17:46,081 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 11:17:46,081 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 11:17:46,081 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 11:17:46,081 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 11:17:46,082 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 11:17:46,082 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 11:17:46,108 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-11-18 11:17:46,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-18 11:17:46,114 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:46,114 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:46,117 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:46,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:46,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1091547452, now seen corresponding path program 1 times [2018-11-18 11:17:46,124 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:46,124 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:46,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:46,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:46,234 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 11:17:46,235 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:46,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 11:17:46,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 11:17:46,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 11:17:46,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 11:17:46,249 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-11-18 11:17:46,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:46,265 INFO L93 Difference]: Finished difference Result 71 states and 98 transitions. [2018-11-18 11:17:46,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 11:17:46,266 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-11-18 11:17:46,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:46,272 INFO L225 Difference]: With dead ends: 71 [2018-11-18 11:17:46,272 INFO L226 Difference]: Without dead ends: 33 [2018-11-18 11:17:46,275 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 11:17:46,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-18 11:17:46,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-18 11:17:46,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 11:17:46,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2018-11-18 11:17:46,300 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 22 [2018-11-18 11:17:46,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:46,300 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2018-11-18 11:17:46,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 11:17:46,301 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2018-11-18 11:17:46,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-18 11:17:46,302 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:46,302 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:46,303 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:46,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:46,303 INFO L82 PathProgramCache]: Analyzing trace with hash 499356089, now seen corresponding path program 1 times [2018-11-18 11:17:46,303 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:46,303 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:46,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:46,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:46,365 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 11:17:46,365 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:46,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 11:17:46,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 11:17:46,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 11:17:46,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 11:17:46,367 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 3 states. [2018-11-18 11:17:46,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:46,462 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2018-11-18 11:17:46,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 11:17:46,462 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2018-11-18 11:17:46,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:46,465 INFO L225 Difference]: With dead ends: 68 [2018-11-18 11:17:46,465 INFO L226 Difference]: Without dead ends: 44 [2018-11-18 11:17:46,466 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 11:17:46,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-18 11:17:46,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2018-11-18 11:17:46,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-18 11:17:46,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2018-11-18 11:17:46,472 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 29 [2018-11-18 11:17:46,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:46,472 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2018-11-18 11:17:46,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 11:17:46,473 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2018-11-18 11:17:46,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-18 11:17:46,473 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:46,473 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:46,474 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:46,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:46,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1017977548, now seen corresponding path program 1 times [2018-11-18 11:17:46,474 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:46,474 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:46,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:46,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:46,546 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 11:17:46,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 11:17:46,546 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:46,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:46,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:46,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:46,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 11:17:46,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:46,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-11-18 11:17:46,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 11:17:46,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 11:17:46,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-11-18 11:17:46,665 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 5 states. [2018-11-18 11:17:46,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:46,802 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2018-11-18 11:17:46,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 11:17:46,803 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-11-18 11:17:46,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:46,805 INFO L225 Difference]: With dead ends: 81 [2018-11-18 11:17:46,805 INFO L226 Difference]: Without dead ends: 55 [2018-11-18 11:17:46,806 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-11-18 11:17:46,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-18 11:17:46,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 43. [2018-11-18 11:17:46,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-18 11:17:46,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2018-11-18 11:17:46,811 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 35 [2018-11-18 11:17:46,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:46,812 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2018-11-18 11:17:46,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 11:17:46,812 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2018-11-18 11:17:46,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-18 11:17:46,813 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:46,813 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:46,813 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:46,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:46,813 INFO L82 PathProgramCache]: Analyzing trace with hash -520435943, now seen corresponding path program 2 times [2018-11-18 11:17:46,814 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:46,814 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:46,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:46,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:46,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:46,886 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 11:17:46,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 11:17:46,886 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:46,910 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 11:17:46,946 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 11:17:46,946 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 11:17:46,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:46,970 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 11:17:46,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:46,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-11-18 11:17:46,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 11:17:46,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 11:17:46,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-18 11:17:46,993 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 6 states. [2018-11-18 11:17:47,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:47,158 INFO L93 Difference]: Finished difference Result 95 states and 112 transitions. [2018-11-18 11:17:47,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 11:17:47,159 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2018-11-18 11:17:47,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:47,159 INFO L225 Difference]: With dead ends: 95 [2018-11-18 11:17:47,159 INFO L226 Difference]: Without dead ends: 66 [2018-11-18 11:17:47,160 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-18 11:17:47,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-18 11:17:47,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 49. [2018-11-18 11:17:47,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-18 11:17:47,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2018-11-18 11:17:47,164 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2018-11-18 11:17:47,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:47,164 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2018-11-18 11:17:47,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 11:17:47,165 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2018-11-18 11:17:47,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-18 11:17:47,166 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:47,166 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:47,166 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:47,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:47,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1254758996, now seen corresponding path program 3 times [2018-11-18 11:17:47,166 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:47,167 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:47,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:47,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 11:17:47,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:47,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:47,232 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 11:17:47,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 11:17:47,232 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:47,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 11:17:47,276 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 11:17:47,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 11:17:47,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:47,299 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 11:17:47,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:47,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-11-18 11:17:47,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 11:17:47,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 11:17:47,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-18 11:17:47,316 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 7 states. [2018-11-18 11:17:47,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:47,604 INFO L93 Difference]: Finished difference Result 109 states and 128 transitions. [2018-11-18 11:17:47,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 11:17:47,605 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 47 [2018-11-18 11:17:47,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:47,606 INFO L225 Difference]: With dead ends: 109 [2018-11-18 11:17:47,606 INFO L226 Difference]: Without dead ends: 77 [2018-11-18 11:17:47,606 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-18 11:17:47,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-18 11:17:47,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2018-11-18 11:17:47,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-18 11:17:47,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 60 transitions. [2018-11-18 11:17:47,611 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 60 transitions. Word has length 47 [2018-11-18 11:17:47,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:47,612 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 60 transitions. [2018-11-18 11:17:47,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 11:17:47,612 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 60 transitions. [2018-11-18 11:17:47,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-18 11:17:47,613 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:47,613 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:47,613 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:47,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:47,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1997667207, now seen corresponding path program 4 times [2018-11-18 11:17:47,614 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:47,614 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:47,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:47,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 11:17:47,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:47,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:47,710 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 11:17:47,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 11:17:47,711 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:47,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 11:17:47,740 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 11:17:47,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 11:17:47,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:47,772 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 11:17:47,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:47,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-11-18 11:17:47,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 11:17:47,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 11:17:47,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-18 11:17:47,790 INFO L87 Difference]: Start difference. First operand 55 states and 60 transitions. Second operand 8 states. [2018-11-18 11:17:47,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:47,970 INFO L93 Difference]: Finished difference Result 121 states and 142 transitions. [2018-11-18 11:17:47,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 11:17:47,971 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 53 [2018-11-18 11:17:47,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:47,972 INFO L225 Difference]: With dead ends: 121 [2018-11-18 11:17:47,972 INFO L226 Difference]: Without dead ends: 86 [2018-11-18 11:17:47,972 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-18 11:17:47,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-11-18 11:17:47,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 61. [2018-11-18 11:17:47,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-18 11:17:47,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2018-11-18 11:17:47,978 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 53 [2018-11-18 11:17:47,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:47,979 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2018-11-18 11:17:47,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 11:17:47,979 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2018-11-18 11:17:47,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-18 11:17:47,980 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:47,980 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:47,980 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:47,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:47,980 INFO L82 PathProgramCache]: Analyzing trace with hash -2113763468, now seen corresponding path program 5 times [2018-11-18 11:17:47,980 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 11:17:47,981 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 11:17:47,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:47,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 11:17:47,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 11:17:48,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 11:17:48,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 11:17:48,067 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 11:17:48,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 11:17:48 BoogieIcfgContainer [2018-11-18 11:17:48,108 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 11:17:48,108 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 11:17:48,109 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 11:17:48,109 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 11:17:48,110 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:45" (3/4) ... [2018-11-18 11:17:48,113 INFO L147 WitnessPrinter]: No result that supports witness generation found [2018-11-18 11:17:48,113 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 11:17:48,114 INFO L168 Benchmark]: Toolchain (without parser) took 3177.92 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 181.9 MB). Free memory was 955.8 MB in the beginning and 985.1 MB in the end (delta: -29.4 MB). Peak memory consumption was 152.6 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:48,115 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 979.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 11:17:48,116 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.34 ms. Allocated memory is still 1.0 GB. Free memory was 955.8 MB in the beginning and 942.3 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:48,116 INFO L168 Benchmark]: Boogie Preprocessor took 37.63 ms. Allocated memory is still 1.0 GB. Free memory is still 942.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 11:17:48,117 INFO L168 Benchmark]: RCFGBuilder took 724.42 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 181.9 MB). Free memory was 942.3 MB in the beginning and 1.2 GB in the end (delta: -214.3 MB). Peak memory consumption was 17.6 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:48,117 INFO L168 Benchmark]: TraceAbstraction took 2164.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 985.1 MB in the end (delta: 171.5 MB). Peak memory consumption was 171.5 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:48,118 INFO L168 Benchmark]: Witness Printer took 5.01 ms. Allocated memory is still 1.2 GB. Free memory is still 985.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 11:17:48,120 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 979.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 242.34 ms. Allocated memory is still 1.0 GB. Free memory was 955.8 MB in the beginning and 942.3 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 37.63 ms. Allocated memory is still 1.0 GB. Free memory is still 942.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 724.42 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 181.9 MB). Free memory was 942.3 MB in the beginning and 1.2 GB in the end (delta: -214.3 MB). Peak memory consumption was 17.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2164.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 985.1 MB in the end (delta: 171.5 MB). Peak memory consumption was 171.5 MB. Max. memory is 11.5 GB. * Witness Printer took 5.01 ms. Allocated memory is still 1.2 GB. Free memory is still 985.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] FCALL char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={8:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={8:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={8:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={8:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={8:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={8:0}, string_B={10:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={8:0}, string_B={10:0}] [L23] EXPR, FCALL string_A[5 -1] VAL [found=0, i=5, string_A={8:0}, string_A[5 -1]=0, string_B={10:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={8:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={8:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={8:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={8:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={8:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={8:0}, string_B={10:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={8:0}, string_B={10:0}] [L27] EXPR, FCALL string_B[5 -1] VAL [found=0, i=5, string_A={8:0}, string_B={10:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={8:0}, string_B={10:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={8:0}, string_A[nc_A]=0, string_B={10:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={8:0}, string_B={10:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={8:0}, string_B={10:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={8:0}, string_B={10:0}] [L41] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 -> 77cd31699320cd40da64f32a92959020d19291bd [2018-11-18 11:17:49,977 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 11:17:49,989 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 11:17:49,993 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 11:17:49,995 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 11:17:49,995 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 11:17:49,997 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-11-18 11:17:50,048 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/3497239f0/44b82d63abd6435bb0b7524755974724/FLAGa07eed5b1 [2018-11-18 11:17:50,401 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 11:17:50,402 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-11-18 11:17:50,406 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/3497239f0/44b82d63abd6435bb0b7524755974724/FLAGa07eed5b1 [2018-11-18 11:17:50,416 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/data/3497239f0/44b82d63abd6435bb0b7524755974724 [2018-11-18 11:17:50,418 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 11:17:50,420 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 11:17:50,421 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 11:17:50,421 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 11:17:50,425 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 11:17:50,426 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,428 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5277f8d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50, skipping insertion in model container [2018-11-18 11:17:50,428 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,434 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 11:17:50,452 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 11:17:50,639 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 11:17:50,642 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 11:17:50,665 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 11:17:50,688 INFO L195 MainTranslator]: Completed translation [2018-11-18 11:17:50,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50 WrapperNode [2018-11-18 11:17:50,689 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 11:17:50,690 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 11:17:50,690 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 11:17:50,690 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 11:17:50,703 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,713 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,713 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,723 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,729 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,731 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... [2018-11-18 11:17:50,733 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 11:17:50,734 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 11:17:50,734 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 11:17:50,734 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 11:17:50,735 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/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 11:17:50,850 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 11:17:50,850 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 11:17:50,850 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 11:17:50,850 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2018-11-18 11:17:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-18 11:17:50,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 11:17:50,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 11:17:50,852 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2018-11-18 11:17:51,166 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 11:17:51,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:51 BoogieIcfgContainer [2018-11-18 11:17:51,167 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 11:17:51,167 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 11:17:51,167 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 11:17:51,170 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 11:17:51,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 11:17:50" (1/3) ... [2018-11-18 11:17:51,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ad9244 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 11:17:51, skipping insertion in model container [2018-11-18 11:17:51,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 11:17:50" (2/3) ... [2018-11-18 11:17:51,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ad9244 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 11:17:51, skipping insertion in model container [2018-11-18 11:17:51,173 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:51" (3/3) ... [2018-11-18 11:17:51,174 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-11-18 11:17:51,180 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 11:17:51,186 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 11:17:51,196 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 11:17:51,220 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 11:17:51,220 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 11:17:51,220 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 11:17:51,220 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 11:17:51,220 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 11:17:51,221 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 11:17:51,221 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 11:17:51,221 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 11:17:51,221 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 11:17:51,235 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-11-18 11:17:51,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-18 11:17:51,239 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:51,240 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:51,242 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:51,245 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:51,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1091547452, now seen corresponding path program 1 times [2018-11-18 11:17:51,248 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:51,248 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 2 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:51,261 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:51,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:51,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:51,320 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 11:17:51,320 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-18 11:17:51,324 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:51,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 11:17:51,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 11:17:51,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 11:17:51,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 11:17:51,337 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-11-18 11:17:51,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:51,352 INFO L93 Difference]: Finished difference Result 71 states and 98 transitions. [2018-11-18 11:17:51,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 11:17:51,354 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-11-18 11:17:51,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:51,361 INFO L225 Difference]: With dead ends: 71 [2018-11-18 11:17:51,361 INFO L226 Difference]: Without dead ends: 33 [2018-11-18 11:17:51,363 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 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 11:17:51,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-18 11:17:51,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-18 11:17:51,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 11:17:51,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2018-11-18 11:17:51,389 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 22 [2018-11-18 11:17:51,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:51,389 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2018-11-18 11:17:51,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 11:17:51,389 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2018-11-18 11:17:51,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-18 11:17:51,390 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:51,390 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:51,390 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:51,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:51,391 INFO L82 PathProgramCache]: Analyzing trace with hash 499356089, now seen corresponding path program 1 times [2018-11-18 11:17:51,391 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:51,391 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:51,411 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:51,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:51,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:51,503 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 11:17:51,503 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-18 11:17:51,505 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:51,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 11:17:51,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 11:17:51,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 11:17:51,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 11:17:51,507 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 3 states. [2018-11-18 11:17:51,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:51,601 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2018-11-18 11:17:51,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 11:17:51,602 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2018-11-18 11:17:51,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:51,604 INFO L225 Difference]: With dead ends: 68 [2018-11-18 11:17:51,604 INFO L226 Difference]: Without dead ends: 44 [2018-11-18 11:17:51,606 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 11:17:51,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-18 11:17:51,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2018-11-18 11:17:51,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-18 11:17:51,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2018-11-18 11:17:51,614 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 29 [2018-11-18 11:17:51,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:51,614 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2018-11-18 11:17:51,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 11:17:51,615 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2018-11-18 11:17:51,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-18 11:17:51,615 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:51,616 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:51,617 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:51,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:51,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1017977548, now seen corresponding path program 1 times [2018-11-18 11:17:51,617 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:51,617 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 4 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:51,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:51,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:51,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:51,723 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 11:17:51,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 11:17:51,798 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 11:17:51,800 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:51,800 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2018-11-18 11:17:51,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 11:17:51,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 11:17:51,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-18 11:17:51,801 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 6 states. [2018-11-18 11:17:52,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:52,003 INFO L93 Difference]: Finished difference Result 101 states and 124 transitions. [2018-11-18 11:17:52,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 11:17:52,004 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2018-11-18 11:17:52,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:52,005 INFO L225 Difference]: With dead ends: 101 [2018-11-18 11:17:52,005 INFO L226 Difference]: Without dead ends: 75 [2018-11-18 11:17:52,006 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-11-18 11:17:52,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-18 11:17:52,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 55. [2018-11-18 11:17:52,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-18 11:17:52,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 60 transitions. [2018-11-18 11:17:52,013 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 60 transitions. Word has length 35 [2018-11-18 11:17:52,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:52,013 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 60 transitions. [2018-11-18 11:17:52,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 11:17:52,014 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 60 transitions. [2018-11-18 11:17:52,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-18 11:17:52,014 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:52,015 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:52,015 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:52,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:52,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1997667207, now seen corresponding path program 2 times [2018-11-18 11:17:52,015 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:52,016 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:52,030 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-11-18 11:17:52,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-11-18 11:17:52,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 11:17:52,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:52,132 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-11-18 11:17:52,133 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-18 11:17:52,140 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:52,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-11-18 11:17:52,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 11:17:52,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 11:17:52,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-11-18 11:17:52,142 INFO L87 Difference]: Start difference. First operand 55 states and 60 transitions. Second operand 7 states. [2018-11-18 11:17:52,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:52,436 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2018-11-18 11:17:52,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 11:17:52,436 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 53 [2018-11-18 11:17:52,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:52,437 INFO L225 Difference]: With dead ends: 74 [2018-11-18 11:17:52,438 INFO L226 Difference]: Without dead ends: 58 [2018-11-18 11:17:52,438 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-11-18 11:17:52,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-18 11:17:52,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-11-18 11:17:52,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-11-18 11:17:52,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-11-18 11:17:52,445 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 53 [2018-11-18 11:17:52,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:52,445 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-11-18 11:17:52,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 11:17:52,445 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-11-18 11:17:52,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-18 11:17:52,446 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:52,446 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:52,446 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:52,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:52,446 INFO L82 PathProgramCache]: Analyzing trace with hash 56481356, now seen corresponding path program 1 times [2018-11-18 11:17:52,447 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:52,447 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 6 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:52,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 11:17:52,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:52,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:52,596 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2018-11-18 11:17:52,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 11:17:52,827 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2018-11-18 11:17:52,829 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 11:17:52,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2018-11-18 11:17:52,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 11:17:52,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 11:17:52,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-11-18 11:17:52,830 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 12 states. [2018-11-18 11:17:53,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:53,512 INFO L93 Difference]: Finished difference Result 129 states and 150 transitions. [2018-11-18 11:17:53,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-18 11:17:53,513 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2018-11-18 11:17:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:53,514 INFO L225 Difference]: With dead ends: 129 [2018-11-18 11:17:53,514 INFO L226 Difference]: Without dead ends: 91 [2018-11-18 11:17:53,514 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-11-18 11:17:53,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-11-18 11:17:53,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 64. [2018-11-18 11:17:53,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-11-18 11:17:53,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2018-11-18 11:17:53,521 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 56 [2018-11-18 11:17:53,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:53,521 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2018-11-18 11:17:53,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 11:17:53,521 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2018-11-18 11:17:53,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-18 11:17:53,524 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:53,524 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:53,525 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:53,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:53,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1118556815, now seen corresponding path program 2 times [2018-11-18 11:17:53,525 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:53,525 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:53,543 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-11-18 11:17:53,586 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-11-18 11:17:53,587 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 11:17:53,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:53,682 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2018-11-18 11:17:53,682 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-18 11:17:53,684 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:53,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-18 11:17:53,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-18 11:17:53,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-18 11:17:53,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-18 11:17:53,688 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 6 states. [2018-11-18 11:17:53,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:53,774 INFO L93 Difference]: Finished difference Result 73 states and 79 transitions. [2018-11-18 11:17:53,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-18 11:17:53,774 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2018-11-18 11:17:53,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:53,775 INFO L225 Difference]: With dead ends: 73 [2018-11-18 11:17:53,775 INFO L226 Difference]: Without dead ends: 67 [2018-11-18 11:17:53,775 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-11-18 11:17:53,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-18 11:17:53,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-11-18 11:17:53,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-18 11:17:53,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-11-18 11:17:53,781 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 62 [2018-11-18 11:17:53,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:53,782 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-11-18 11:17:53,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-18 11:17:53,782 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-11-18 11:17:53,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-18 11:17:53,783 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:53,783 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 11:17:53,783 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:53,783 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:53,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1628470394, now seen corresponding path program 1 times [2018-11-18 11:17:53,785 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:53,785 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:53,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 11:17:53,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 11:17:53,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 11:17:53,899 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2018-11-18 11:17:53,899 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-18 11:17:53,901 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 11:17:53,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-18 11:17:53,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-18 11:17:53,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-18 11:17:53,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-18 11:17:53,902 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 4 states. [2018-11-18 11:17:53,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 11:17:53,928 INFO L93 Difference]: Finished difference Result 88 states and 96 transitions. [2018-11-18 11:17:53,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-18 11:17:53,929 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 65 [2018-11-18 11:17:53,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 11:17:53,932 INFO L225 Difference]: With dead ends: 88 [2018-11-18 11:17:53,932 INFO L226 Difference]: Without dead ends: 69 [2018-11-18 11:17:53,933 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-18 11:17:53,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-18 11:17:53,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-18 11:17:53,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-18 11:17:53,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-11-18 11:17:53,943 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-11-18 11:17:53,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 11:17:53,943 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-11-18 11:17:53,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-18 11:17:53,944 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-11-18 11:17:53,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-18 11:17:53,944 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 11:17:53,944 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1] [2018-11-18 11:17:53,945 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 11:17:53,945 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 11:17:53,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1884990006, now seen corresponding path program 1 times [2018-11-18 11:17:53,945 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-18 11:17:53,945 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-11-18 11:17:53,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 11:17:54,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 11:17:54,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 11:17:54,365 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 11:17:54,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 11:17:54 BoogieIcfgContainer [2018-11-18 11:17:54,406 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 11:17:54,406 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 11:17:54,407 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 11:17:54,407 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 11:17:54,407 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 11:17:51" (3/4) ... [2018-11-18 11:17:54,409 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 11:17:54,476 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_0ca6624e-6691-4b62-9445-48f4795cb089/bin-2019/uautomizer/witness.graphml [2018-11-18 11:17:54,476 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 11:17:54,477 INFO L168 Benchmark]: Toolchain (without parser) took 4057.98 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 109.6 MB). Free memory was 950.8 MB in the beginning and 813.7 MB in the end (delta: 137.1 MB). Peak memory consumption was 246.7 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:54,479 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 11:17:54,479 INFO L168 Benchmark]: CACSL2BoogieTranslator took 268.47 ms. Allocated memory is still 1.0 GB. Free memory was 950.8 MB in the beginning and 934.7 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:54,479 INFO L168 Benchmark]: Boogie Preprocessor took 43.90 ms. Allocated memory is still 1.0 GB. Free memory is still 934.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 11:17:54,480 INFO L168 Benchmark]: RCFGBuilder took 432.85 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 109.6 MB). Free memory was 934.7 MB in the beginning and 1.1 GB in the end (delta: -135.3 MB). Peak memory consumption was 15.1 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:54,480 INFO L168 Benchmark]: TraceAbstraction took 3238.83 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 820.8 MB in the end (delta: 249.2 MB). Peak memory consumption was 249.2 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:54,480 INFO L168 Benchmark]: Witness Printer took 69.79 ms. Allocated memory is still 1.1 GB. Free memory was 820.8 MB in the beginning and 813.7 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 11.5 GB. [2018-11-18 11:17:54,483 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 268.47 ms. Allocated memory is still 1.0 GB. Free memory was 950.8 MB in the beginning and 934.7 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 43.90 ms. Allocated memory is still 1.0 GB. Free memory is still 934.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 432.85 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 109.6 MB). Free memory was 934.7 MB in the beginning and 1.1 GB in the end (delta: -135.3 MB). Peak memory consumption was 15.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3238.83 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 820.8 MB in the end (delta: 249.2 MB). Peak memory consumption was 249.2 MB. Max. memory is 11.5 GB. * Witness Printer took 69.79 ms. Allocated memory is still 1.1 GB. Free memory was 820.8 MB in the beginning and 813.7 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 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: [L17] FCALL char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L23] EXPR, FCALL string_A[5 -1] VAL [found=0, i=5, string_A={2:0}, string_A[5 -1]=0, string_B={3:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L27] EXPR, FCALL string_B[5 -1] VAL [found=0, i=5, string_A={2:0}, string_B={3:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={2:0}, string_B={3:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={2:0}, string_A[nc_A]=1, string_B={3:0}] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ VAL [found=0, i=5, nc_A=1, string_A={2:0}, string_B={3:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=1, string_A={2:0}, string_A[nc_A]=0, string_B={3:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={2:0}, string_B={3:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={2:0}, string_B={3:0}, string_B[nc_B]=1] [L34] COND TRUE string_B[nc_B]!='\0' [L35] nc_B++ VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={2:0}, string_B={3:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={2:0}, string_B={3:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=1, nc_B=1, string_A={2:0}, string_B={3:0}] [L41] COND TRUE (inc_B-1)<