./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b5699aa Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 77cd31699320cd40da64f32a92959020d19291bd ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 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 0.1.24-6b5699a [2019-11-25 08:53:28,287 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-25 08:53:28,288 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-25 08:53:28,298 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-25 08:53:28,299 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-25 08:53:28,299 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-25 08:53:28,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-25 08:53:28,303 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-25 08:53:28,304 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-25 08:53:28,305 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-25 08:53:28,306 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-25 08:53:28,307 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-25 08:53:28,307 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-25 08:53:28,308 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-25 08:53:28,309 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-25 08:53:28,315 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-25 08:53:28,316 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-25 08:53:28,317 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-25 08:53:28,318 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-25 08:53:28,320 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-25 08:53:28,322 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-25 08:53:28,323 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-25 08:53:28,324 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-25 08:53:28,325 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-25 08:53:28,327 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-25 08:53:28,327 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-25 08:53:28,328 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-25 08:53:28,328 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-25 08:53:28,332 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-25 08:53:28,335 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-25 08:53:28,335 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-25 08:53:28,336 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-25 08:53:28,336 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-25 08:53:28,338 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-25 08:53:28,341 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-25 08:53:28,341 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-25 08:53:28,341 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-25 08:53:28,342 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-25 08:53:28,342 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-25 08:53:28,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-25 08:53:28,346 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-25 08:53:28,347 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-25 08:53:28,365 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-25 08:53:28,365 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-25 08:53:28,366 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-25 08:53:28,366 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-25 08:53:28,366 INFO L138 SettingsManager]: * Use SBE=true [2019-11-25 08:53:28,367 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-25 08:53:28,367 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-25 08:53:28,367 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-25 08:53:28,367 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-25 08:53:28,367 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-25 08:53:28,368 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-25 08:53:28,368 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-25 08:53:28,369 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-25 08:53:28,369 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-25 08:53:28,369 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-25 08:53:28,369 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-25 08:53:28,369 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-25 08:53:28,370 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-25 08:53:28,370 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-25 08:53:28,370 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-25 08:53:28,370 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-25 08:53:28,370 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:53:28,370 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-25 08:53:28,371 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-25 08:53:28,371 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-25 08:53:28,371 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-25 08:53:28,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-25 08:53:28,371 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-25 08:53:28,372 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77cd31699320cd40da64f32a92959020d19291bd [2019-11-25 08:53:28,520 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-25 08:53:28,537 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-25 08:53:28,547 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-25 08:53:28,548 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-25 08:53:28,549 INFO L275 PluginConnector]: CDTParser initialized [2019-11-25 08:53:28,549 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2019-11-25 08:53:28,608 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/2e3972601/74b749f361db488c9454cbee34ae4b4d/FLAGe6b7c4e46 [2019-11-25 08:53:29,022 INFO L306 CDTParser]: Found 1 translation units. [2019-11-25 08:53:29,022 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/sv-benchmarks/c/loops/string-2.i [2019-11-25 08:53:29,027 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/2e3972601/74b749f361db488c9454cbee34ae4b4d/FLAGe6b7c4e46 [2019-11-25 08:53:29,379 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/2e3972601/74b749f361db488c9454cbee34ae4b4d [2019-11-25 08:53:29,382 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-25 08:53:29,383 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-25 08:53:29,384 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:29,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-25 08:53:29,390 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-25 08:53:29,390 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,393 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bb60151 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29, skipping insertion in model container [2019-11-25 08:53:29,393 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,402 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-25 08:53:29,421 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-25 08:53:29,680 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:29,684 INFO L201 MainTranslator]: Completed pre-run [2019-11-25 08:53:29,720 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:29,737 INFO L205 MainTranslator]: Completed translation [2019-11-25 08:53:29,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29 WrapperNode [2019-11-25 08:53:29,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:29,739 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:29,739 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-25 08:53:29,739 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-25 08:53:29,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,753 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,774 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:29,775 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-25 08:53:29,775 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-25 08:53:29,775 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-25 08:53:29,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,785 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,786 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,794 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,798 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,800 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... [2019-11-25 08:53:29,813 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-25 08:53:29,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-25 08:53:29,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-25 08:53:29,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-25 08:53:29,814 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:53:29,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-25 08:53:29,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-25 08:53:29,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-25 08:53:29,883 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-25 08:53:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-25 08:53:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-25 08:53:30,131 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-25 08:53:30,131 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-25 08:53:30,132 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:30 BoogieIcfgContainer [2019-11-25 08:53:30,132 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-25 08:53:30,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-25 08:53:30,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-25 08:53:30,136 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-25 08:53:30,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:53:29" (1/3) ... [2019-11-25 08:53:30,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140c3f93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:53:30, skipping insertion in model container [2019-11-25 08:53:30,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:29" (2/3) ... [2019-11-25 08:53:30,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140c3f93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:53:30, skipping insertion in model container [2019-11-25 08:53:30,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:30" (3/3) ... [2019-11-25 08:53:30,139 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-11-25 08:53:30,146 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-25 08:53:30,152 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-25 08:53:30,160 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-25 08:53:30,178 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-25 08:53:30,179 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-25 08:53:30,179 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-25 08:53:30,179 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-25 08:53:30,179 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-25 08:53:30,179 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-25 08:53:30,179 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-25 08:53:30,180 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-25 08:53:30,192 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-25 08:53:30,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-25 08:53:30,198 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:30,198 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:30,199 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:30,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:30,203 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2019-11-25 08:53:30,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:30,209 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944717970] [2019-11-25 08:53:30,209 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:30,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:30,321 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944717970] [2019-11-25 08:53:30,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:30,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-25 08:53:30,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467248676] [2019-11-25 08:53:30,326 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-25 08:53:30,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:30,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-25 08:53:30,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-25 08:53:30,341 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-11-25 08:53:30,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:30,357 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2019-11-25 08:53:30,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-25 08:53:30,358 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-11-25 08:53:30,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:30,364 INFO L225 Difference]: With dead ends: 48 [2019-11-25 08:53:30,364 INFO L226 Difference]: Without dead ends: 22 [2019-11-25 08:53:30,367 INFO L630 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 [2019-11-25 08:53:30,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-25 08:53:30,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-25 08:53:30,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-25 08:53:30,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2019-11-25 08:53:30,395 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2019-11-25 08:53:30,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:30,395 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2019-11-25 08:53:30,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-25 08:53:30,396 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2019-11-25 08:53:30,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-25 08:53:30,396 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:30,396 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:30,397 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:30,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:30,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2019-11-25 08:53:30,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:30,398 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724160320] [2019-11-25 08:53:30,398 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:30,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:30,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:30,450 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724160320] [2019-11-25 08:53:30,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:30,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-25 08:53:30,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311649574] [2019-11-25 08:53:30,452 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-25 08:53:30,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:30,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-25 08:53:30,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:53:30,453 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2019-11-25 08:53:30,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:30,509 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2019-11-25 08:53:30,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-25 08:53:30,509 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-25 08:53:30,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:30,512 INFO L225 Difference]: With dead ends: 50 [2019-11-25 08:53:30,512 INFO L226 Difference]: Without dead ends: 32 [2019-11-25 08:53:30,513 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:53:30,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-25 08:53:30,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2019-11-25 08:53:30,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-25 08:53:30,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-11-25 08:53:30,519 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2019-11-25 08:53:30,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:30,519 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-11-25 08:53:30,519 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-25 08:53:30,519 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-11-25 08:53:30,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-25 08:53:30,520 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:30,520 INFO L410 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] [2019-11-25 08:53:30,521 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:30,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:30,522 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2019-11-25 08:53:30,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:30,522 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330708449] [2019-11-25 08:53:30,522 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:30,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:30,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-25 08:53:30,602 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330708449] [2019-11-25 08:53:30,602 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832247065] [2019-11-25 08:53:30,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:30,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:30,680 INFO L255 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-25 08:53:30,685 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:30,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-25 08:53:30,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:30,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-25 08:53:30,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912305562] [2019-11-25 08:53:30,714 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-25 08:53:30,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:30,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-25 08:53:30,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-25 08:53:30,715 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2019-11-25 08:53:30,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:30,795 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2019-11-25 08:53:30,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-25 08:53:30,797 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2019-11-25 08:53:30,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:30,798 INFO L225 Difference]: With dead ends: 61 [2019-11-25 08:53:30,798 INFO L226 Difference]: Without dead ends: 42 [2019-11-25 08:53:30,799 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-25 08:53:30,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-25 08:53:30,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2019-11-25 08:53:30,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-25 08:53:30,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-11-25 08:53:30,804 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2019-11-25 08:53:30,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:30,804 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-11-25 08:53:30,804 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-25 08:53:30,804 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-11-25 08:53:30,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-25 08:53:30,805 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:30,805 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:31,009 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:31,010 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:31,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:31,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 2 times [2019-11-25 08:53:31,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:31,011 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120245549] [2019-11-25 08:53:31,011 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:31,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:31,101 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-25 08:53:31,101 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120245549] [2019-11-25 08:53:31,101 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864015298] [2019-11-25 08:53:31,102 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:31,157 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-25 08:53:31,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-25 08:53:31,158 INFO L255 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-25 08:53:31,162 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-25 08:53:31,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:31,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-25 08:53:31,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348142908] [2019-11-25 08:53:31,178 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-25 08:53:31,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:31,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-25 08:53:31,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:53:31,181 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 6 states. [2019-11-25 08:53:31,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:31,264 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2019-11-25 08:53:31,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-25 08:53:31,265 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2019-11-25 08:53:31,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:31,266 INFO L225 Difference]: With dead ends: 73 [2019-11-25 08:53:31,266 INFO L226 Difference]: Without dead ends: 52 [2019-11-25 08:53:31,267 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:53:31,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-25 08:53:31,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2019-11-25 08:53:31,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-25 08:53:31,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-11-25 08:53:31,272 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2019-11-25 08:53:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:31,273 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-11-25 08:53:31,274 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-25 08:53:31,275 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-11-25 08:53:31,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-25 08:53:31,276 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:31,276 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:31,480 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:31,480 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:31,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:31,480 INFO L82 PathProgramCache]: Analyzing trace with hash -381068522, now seen corresponding path program 3 times [2019-11-25 08:53:31,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:31,481 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735694397] [2019-11-25 08:53:31,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:31,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:31,569 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-25 08:53:31,570 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735694397] [2019-11-25 08:53:31,570 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112782604] [2019-11-25 08:53:31,570 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:31,630 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-25 08:53:31,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-25 08:53:31,631 INFO L255 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-25 08:53:31,633 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:31,650 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-25 08:53:31,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:31,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-11-25 08:53:31,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897008530] [2019-11-25 08:53:31,651 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-25 08:53:31,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:31,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-25 08:53:31,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-25 08:53:31,652 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 7 states. [2019-11-25 08:53:31,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:31,739 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2019-11-25 08:53:31,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-25 08:53:31,740 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-11-25 08:53:31,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:31,741 INFO L225 Difference]: With dead ends: 85 [2019-11-25 08:53:31,741 INFO L226 Difference]: Without dead ends: 62 [2019-11-25 08:53:31,742 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-25 08:53:31,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-25 08:53:31,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2019-11-25 08:53:31,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-25 08:53:31,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2019-11-25 08:53:31,747 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2019-11-25 08:53:31,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:31,748 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2019-11-25 08:53:31,748 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-25 08:53:31,748 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2019-11-25 08:53:31,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-25 08:53:31,749 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:31,749 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:31,949 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:31,950 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:31,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:31,950 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 4 times [2019-11-25 08:53:31,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:31,950 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49565524] [2019-11-25 08:53:31,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:31,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-25 08:53:32,020 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49565524] [2019-11-25 08:53:32,020 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668507929] [2019-11-25 08:53:32,020 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:32,094 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-25 08:53:32,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-25 08:53:32,096 INFO L255 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-25 08:53:32,099 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-25 08:53:32,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:32,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-25 08:53:32,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087090983] [2019-11-25 08:53:32,118 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-25 08:53:32,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:53:32,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-25 08:53:32,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-25 08:53:32,119 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2019-11-25 08:53:32,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:32,245 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2019-11-25 08:53:32,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-25 08:53:32,247 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2019-11-25 08:53:32,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:32,248 INFO L225 Difference]: With dead ends: 95 [2019-11-25 08:53:32,248 INFO L226 Difference]: Without dead ends: 70 [2019-11-25 08:53:32,248 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-25 08:53:32,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-25 08:53:32,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2019-11-25 08:53:32,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-25 08:53:32,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-11-25 08:53:32,261 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2019-11-25 08:53:32,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:32,261 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-11-25 08:53:32,261 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-25 08:53:32,262 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-11-25 08:53:32,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-25 08:53:32,264 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:32,264 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:32,468 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-25 08:53:32,468 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:32,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:32,469 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 5 times [2019-11-25 08:53:32,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:53:32,469 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913411215] [2019-11-25 08:53:32,469 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:53:32,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:53:32,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:53:32,574 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-25 08:53:32,574 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-25 08:53:32,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 08:53:32 BoogieIcfgContainer [2019-11-25 08:53:32,639 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-25 08:53:32,639 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-25 08:53:32,639 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-25 08:53:32,640 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-25 08:53:32,640 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:30" (3/4) ... [2019-11-25 08:53:32,661 INFO L140 WitnessPrinter]: No result that supports witness generation found [2019-11-25 08:53:32,661 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-25 08:53:32,663 INFO L168 Benchmark]: Toolchain (without parser) took 3279.14 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 174.1 MB). Free memory was 948.7 MB in the beginning and 977.1 MB in the end (delta: -28.3 MB). Peak memory consumption was 145.7 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:32,664 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:32,664 INFO L168 Benchmark]: CACSL2BoogieTranslator took 354.16 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 174.1 MB). Free memory was 948.7 MB in the beginning and 1.2 GB in the end (delta: -217.4 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:32,673 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.82 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:32,673 INFO L168 Benchmark]: Boogie Preprocessor took 38.04 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:32,674 INFO L168 Benchmark]: RCFGBuilder took 319.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 28.5 MB). Peak memory consumption was 28.5 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:32,675 INFO L168 Benchmark]: TraceAbstraction took 2505.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 977.1 MB in the end (delta: 160.5 MB). Peak memory consumption was 160.5 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:32,676 INFO L168 Benchmark]: Witness Printer took 22.14 ms. Allocated memory is still 1.2 GB. Free memory is still 977.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:32,680 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 354.16 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 174.1 MB). Free memory was 948.7 MB in the beginning and 1.2 GB in the end (delta: -217.4 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 35.82 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 38.04 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 319.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 28.5 MB). Peak memory consumption was 28.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2505.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 977.1 MB in the end (delta: 160.5 MB). Peak memory consumption was 160.5 MB. Max. memory is 11.5 GB. * Witness Printer took 22.14 ms. Allocated memory is still 1.2 GB. Free memory is still 977.1 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] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=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/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77cd31699320cd40da64f32a92959020d19291bd [2019-11-25 08:53:35,001 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-25 08:53:35,019 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-25 08:53:35,022 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-25 08:53:35,023 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-25 08:53:35,024 INFO L275 PluginConnector]: CDTParser initialized [2019-11-25 08:53:35,025 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2019-11-25 08:53:35,085 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/13f7cd03d/88126c34e8de46cbb88b4773a7ad9265/FLAG1c5ead22a [2019-11-25 08:53:35,524 INFO L306 CDTParser]: Found 1 translation units. [2019-11-25 08:53:35,525 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/sv-benchmarks/c/loops/string-2.i [2019-11-25 08:53:35,531 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/13f7cd03d/88126c34e8de46cbb88b4773a7ad9265/FLAG1c5ead22a [2019-11-25 08:53:35,927 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/data/13f7cd03d/88126c34e8de46cbb88b4773a7ad9265 [2019-11-25 08:53:35,929 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-25 08:53:35,930 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-25 08:53:35,931 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:35,931 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-25 08:53:35,939 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-25 08:53:35,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:35" (1/1) ... [2019-11-25 08:53:35,942 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@580e4d90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:35, skipping insertion in model container [2019-11-25 08:53:35,942 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:35" (1/1) ... [2019-11-25 08:53:35,948 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-25 08:53:35,973 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-25 08:53:36,159 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:36,163 INFO L201 MainTranslator]: Completed pre-run [2019-11-25 08:53:36,206 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:36,277 INFO L205 MainTranslator]: Completed translation [2019-11-25 08:53:36,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36 WrapperNode [2019-11-25 08:53:36,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:36,278 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:36,279 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-25 08:53:36,279 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-25 08:53:36,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,302 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,323 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:36,323 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-25 08:53:36,323 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-25 08:53:36,324 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-25 08:53:36,333 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,333 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,336 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,336 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,343 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,348 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... [2019-11-25 08:53:36,353 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-25 08:53:36,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-25 08:53:36,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-25 08:53:36,354 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-25 08:53:36,355 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:53:36,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-11-25 08:53:36,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-25 08:53:36,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-25 08:53:36,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-11-25 08:53:36,413 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-25 08:53:36,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-25 08:53:36,741 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-25 08:53:36,741 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-25 08:53:36,742 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:36 BoogieIcfgContainer [2019-11-25 08:53:36,742 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-25 08:53:36,743 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-25 08:53:36,743 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-25 08:53:36,746 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-25 08:53:36,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:53:35" (1/3) ... [2019-11-25 08:53:36,747 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28117854 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:53:36, skipping insertion in model container [2019-11-25 08:53:36,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:36" (2/3) ... [2019-11-25 08:53:36,747 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28117854 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:53:36, skipping insertion in model container [2019-11-25 08:53:36,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:36" (3/3) ... [2019-11-25 08:53:36,749 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-11-25 08:53:36,758 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-25 08:53:36,763 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-25 08:53:36,771 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-25 08:53:36,794 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-25 08:53:36,794 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-25 08:53:36,794 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-25 08:53:36,794 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-25 08:53:36,795 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-25 08:53:36,795 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-25 08:53:36,795 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-25 08:53:36,795 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-25 08:53:36,807 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-25 08:53:36,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-25 08:53:36,812 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:36,813 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:36,813 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:36,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:36,818 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2019-11-25 08:53:36,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:36,826 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1510688944] [2019-11-25 08:53:36,827 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:36,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:36,913 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2019-11-25 08:53:36,917 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:36,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:36,930 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:36,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:36,936 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1510688944] [2019-11-25 08:53:36,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:36,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-25 08:53:36,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626033481] [2019-11-25 08:53:36,941 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-25 08:53:36,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:36,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-25 08:53:36,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-25 08:53:36,953 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-11-25 08:53:36,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:36,967 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2019-11-25 08:53:36,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-25 08:53:36,968 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-11-25 08:53:36,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:36,976 INFO L225 Difference]: With dead ends: 48 [2019-11-25 08:53:36,976 INFO L226 Difference]: Without dead ends: 22 [2019-11-25 08:53:36,979 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-25 08:53:36,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-25 08:53:37,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-25 08:53:37,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-25 08:53:37,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2019-11-25 08:53:37,011 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2019-11-25 08:53:37,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:37,012 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2019-11-25 08:53:37,012 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-25 08:53:37,012 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2019-11-25 08:53:37,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-25 08:53:37,013 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:37,013 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:37,215 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:37,215 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:37,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:37,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2019-11-25 08:53:37,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:37,216 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [604793265] [2019-11-25 08:53:37,217 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:37,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:37,302 INFO L255 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-25 08:53:37,303 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:37,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:37,321 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:37,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:53:37,333 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [604793265] [2019-11-25 08:53:37,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:37,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-25 08:53:37,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642884397] [2019-11-25 08:53:37,335 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-25 08:53:37,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:37,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-25 08:53:37,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-25 08:53:37,336 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 4 states. [2019-11-25 08:53:37,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:37,454 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2019-11-25 08:53:37,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-25 08:53:37,455 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-25 08:53:37,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:37,457 INFO L225 Difference]: With dead ends: 58 [2019-11-25 08:53:37,458 INFO L226 Difference]: Without dead ends: 40 [2019-11-25 08:53:37,459 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-25 08:53:37,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-25 08:53:37,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 28. [2019-11-25 08:53:37,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-25 08:53:37,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-11-25 08:53:37,466 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 18 [2019-11-25 08:53:37,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:37,466 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-11-25 08:53:37,466 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-25 08:53:37,466 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-11-25 08:53:37,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-25 08:53:37,468 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:37,468 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:37,670 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:37,670 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:37,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:37,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 1 times [2019-11-25 08:53:37,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:37,672 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1987537592] [2019-11-25 08:53:37,672 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:37,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:37,787 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-25 08:53:37,789 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:37,829 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-25 08:53:37,829 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:37,905 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-25 08:53:37,905 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1987537592] [2019-11-25 08:53:37,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:37,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-11-25 08:53:37,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077409335] [2019-11-25 08:53:37,906 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-25 08:53:37,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:37,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-25 08:53:37,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-25 08:53:37,907 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 8 states. [2019-11-25 08:53:38,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:38,289 INFO L93 Difference]: Finished difference Result 91 states and 111 transitions. [2019-11-25 08:53:38,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-25 08:53:38,291 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-11-25 08:53:38,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:38,292 INFO L225 Difference]: With dead ends: 91 [2019-11-25 08:53:38,292 INFO L226 Difference]: Without dead ends: 70 [2019-11-25 08:53:38,293 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2019-11-25 08:53:38,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-25 08:53:38,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2019-11-25 08:53:38,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-25 08:53:38,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-11-25 08:53:38,301 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 26 [2019-11-25 08:53:38,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:38,302 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-11-25 08:53:38,302 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-25 08:53:38,302 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-11-25 08:53:38,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-25 08:53:38,303 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:38,303 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:38,503 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:38,504 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:38,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:38,504 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 2 times [2019-11-25 08:53:38,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:38,505 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1629026123] [2019-11-25 08:53:38,505 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:38,591 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-11-25 08:53:38,591 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-25 08:53:38,593 INFO L255 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-25 08:53:38,596 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:38,666 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-25 08:53:38,666 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:38,683 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:53:38,779 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-25 08:53:38,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1629026123] [2019-11-25 08:53:38,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:38,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 4] imperfect sequences [] total 8 [2019-11-25 08:53:38,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585205259] [2019-11-25 08:53:38,781 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-25 08:53:38,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:38,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-25 08:53:38,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-25 08:53:38,782 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 8 states. [2019-11-25 08:53:39,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:39,220 INFO L93 Difference]: Finished difference Result 70 states and 83 transitions. [2019-11-25 08:53:39,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-25 08:53:39,220 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2019-11-25 08:53:39,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:39,222 INFO L225 Difference]: With dead ends: 70 [2019-11-25 08:53:39,222 INFO L226 Difference]: Without dead ends: 56 [2019-11-25 08:53:39,222 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2019-11-25 08:53:39,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-25 08:53:39,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2019-11-25 08:53:39,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-25 08:53:39,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2019-11-25 08:53:39,230 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 38 [2019-11-25 08:53:39,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:39,230 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2019-11-25 08:53:39,231 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-25 08:53:39,231 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2019-11-25 08:53:39,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-25 08:53:39,232 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:39,232 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:39,435 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:39,435 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:39,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:39,435 INFO L82 PathProgramCache]: Analyzing trace with hash -364393356, now seen corresponding path program 1 times [2019-11-25 08:53:39,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:39,436 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [143821946] [2019-11-25 08:53:39,436 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:39,569 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-25 08:53:39,571 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:39,597 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-25 08:53:39,597 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:39,618 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-25 08:53:39,620 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [143821946] [2019-11-25 08:53:39,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:53:39,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-25 08:53:39,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459899802] [2019-11-25 08:53:39,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-25 08:53:39,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:39,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-25 08:53:39,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:53:39,624 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 6 states. [2019-11-25 08:53:39,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:39,719 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2019-11-25 08:53:39,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-25 08:53:39,720 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2019-11-25 08:53:39,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:39,721 INFO L225 Difference]: With dead ends: 56 [2019-11-25 08:53:39,721 INFO L226 Difference]: Without dead ends: 43 [2019-11-25 08:53:39,722 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:53:39,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-25 08:53:39,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-11-25 08:53:39,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-25 08:53:39,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2019-11-25 08:53:39,728 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 42 [2019-11-25 08:53:39,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:39,728 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2019-11-25 08:53:39,728 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-25 08:53:39,728 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2019-11-25 08:53:39,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-25 08:53:39,731 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:39,732 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:53:39,933 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:39,933 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:39,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:39,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1856180322, now seen corresponding path program 1 times [2019-11-25 08:53:39,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:39,936 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1813297079] [2019-11-25 08:53:39,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:40,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:53:40,077 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-25 08:53:40,080 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:53:40,120 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-25 08:53:40,120 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:53:40,175 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-25 08:53:40,175 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1813297079] [2019-11-25 08:53:40,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:53:40,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-11-25 08:53:40,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219159740] [2019-11-25 08:53:40,176 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-25 08:53:40,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:53:40,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-25 08:53:40,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-25 08:53:40,177 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 8 states. [2019-11-25 08:53:40,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:53:40,385 INFO L93 Difference]: Finished difference Result 98 states and 116 transitions. [2019-11-25 08:53:40,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-25 08:53:40,386 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2019-11-25 08:53:40,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:53:40,387 INFO L225 Difference]: With dead ends: 98 [2019-11-25 08:53:40,388 INFO L226 Difference]: Without dead ends: 88 [2019-11-25 08:53:40,388 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2019-11-25 08:53:40,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-11-25 08:53:40,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 52. [2019-11-25 08:53:40,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-25 08:53:40,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-11-25 08:53:40,396 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 42 [2019-11-25 08:53:40,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:53:40,397 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-11-25 08:53:40,397 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-25 08:53:40,397 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-11-25 08:53:40,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-25 08:53:40,398 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:53:40,398 INFO L410 BasicCegarLoop]: trace histogram [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] [2019-11-25 08:53:40,600 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:40,601 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:53:40,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:53:40,601 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 1 times [2019-11-25 08:53:40,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:53:40,602 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1655947999] [2019-11-25 08:53:40,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:40,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:53:41,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:53:41,450 INFO L174 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2019-11-25 08:53:41,450 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-25 08:53:41,658 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:53:41,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 08:53:41 BoogieIcfgContainer [2019-11-25 08:53:41,697 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-25 08:53:41,698 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-25 08:53:41,698 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-25 08:53:41,698 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-25 08:53:41,699 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:53:36" (3/4) ... [2019-11-25 08:53:41,701 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-25 08:53:41,765 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_316b21d2-6153-41ef-9f8e-3ce00c5d38ca/bin/uautomizer/witness.graphml [2019-11-25 08:53:41,765 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-25 08:53:41,767 INFO L168 Benchmark]: Toolchain (without parser) took 5836.19 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.8 MB). Free memory was 957.8 MB in the beginning and 883.2 MB in the end (delta: 74.5 MB). Peak memory consumption was 232.3 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:41,767 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:41,768 INFO L168 Benchmark]: CACSL2BoogieTranslator took 347.22 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.8 MB). Free memory was 957.8 MB in the beginning and 1.1 GB in the end (delta: -190.4 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:41,768 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.63 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:41,769 INFO L168 Benchmark]: Boogie Preprocessor took 29.68 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:41,769 INFO L168 Benchmark]: RCFGBuilder took 389.15 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 26.1 MB). Peak memory consumption was 26.1 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:41,769 INFO L168 Benchmark]: TraceAbstraction took 4954.34 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 883.2 MB in the end (delta: 238.8 MB). Peak memory consumption was 238.8 MB. Max. memory is 11.5 GB. [2019-11-25 08:53:41,770 INFO L168 Benchmark]: Witness Printer took 67.31 ms. Allocated memory is still 1.2 GB. Free memory is still 883.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:53:41,772 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 347.22 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.8 MB). Free memory was 957.8 MB in the beginning and 1.1 GB in the end (delta: -190.4 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 44.63 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 29.68 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 389.15 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 26.1 MB). Peak memory consumption was 26.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 4954.34 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 883.2 MB in the end (delta: 238.8 MB). Peak memory consumption was 238.8 MB. Max. memory is 11.5 GB. * Witness Printer took 67.31 ms. Allocated memory is still 1.2 GB. Free memory is still 883.2 MB. There was no memory consumed. 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] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR string_A[nc_A] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ [L30] EXPR string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR string_B[nc_B] [L34] COND TRUE string_B[nc_B]!='\0' [L35] nc_B++ [L34] EXPR string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 [L41] COND TRUE (inc_B-1)<