./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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 0.2.0-a4ecdab [2020-11-29 23:35:13,219 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 23:35:13,226 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 23:35:13,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 23:35:13,275 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 23:35:13,276 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 23:35:13,278 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 23:35:13,280 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 23:35:13,283 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 23:35:13,284 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 23:35:13,285 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 23:35:13,287 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 23:35:13,287 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 23:35:13,288 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 23:35:13,290 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 23:35:13,291 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 23:35:13,292 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 23:35:13,293 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 23:35:13,296 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 23:35:13,298 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 23:35:13,300 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 23:35:13,302 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 23:35:13,303 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 23:35:13,304 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 23:35:13,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 23:35:13,309 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 23:35:13,309 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 23:35:13,310 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 23:35:13,311 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 23:35:13,312 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 23:35:13,312 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 23:35:13,313 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 23:35:13,314 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 23:35:13,315 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 23:35:13,317 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 23:35:13,317 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 23:35:13,318 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 23:35:13,318 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 23:35:13,319 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 23:35:13,320 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 23:35:13,320 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 23:35:13,323 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-29 23:35:13,371 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 23:35:13,371 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 23:35:13,373 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 23:35:13,374 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 23:35:13,374 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 23:35:13,374 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 23:35:13,374 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-29 23:35:13,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 23:35:13,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-29 23:35:13,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 23:35:13,376 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-29 23:35:13,376 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-29 23:35:13,377 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-29 23:35:13,377 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-29 23:35:13,377 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 23:35:13,377 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 23:35:13,378 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-29 23:35:13,378 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 23:35:13,378 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 23:35:13,378 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-29 23:35:13,379 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-29 23:35:13,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-29 23:35:13,379 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 23:35:13,379 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-29 23:35:13,379 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-29 23:35:13,380 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 23:35:13,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-29 23:35:13,380 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-29 23:35:13,380 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 23:35:13,381 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-29 23:35:13,685 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 23:35:13,726 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 23:35:13,731 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 23:35:13,732 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 23:35:13,733 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 23:35:13,735 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2020-11-29 23:35:13,814 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/e87ba689b/c3138886ccd648aea667206193e4f1e4/FLAG3f8ec0165 [2020-11-29 23:35:14,235 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 23:35:14,235 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/sv-benchmarks/c/loops/string-2.i [2020-11-29 23:35:14,241 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/e87ba689b/c3138886ccd648aea667206193e4f1e4/FLAG3f8ec0165 [2020-11-29 23:35:14,646 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/e87ba689b/c3138886ccd648aea667206193e4f1e4 [2020-11-29 23:35:14,648 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 23:35:14,649 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 23:35:14,652 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 23:35:14,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 23:35:14,656 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 23:35:14,656 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:14,659 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bbddfe3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14, skipping insertion in model container [2020-11-29 23:35:14,659 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:14,667 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 23:35:14,686 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 23:35:14,948 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:35:14,955 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 23:35:14,977 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:35:14,992 INFO L208 MainTranslator]: Completed translation [2020-11-29 23:35:14,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14 WrapperNode [2020-11-29 23:35:14,993 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 23:35:14,994 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 23:35:14,994 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 23:35:14,995 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 23:35:15,002 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,010 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,033 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 23:35:15,034 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 23:35:15,035 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 23:35:15,035 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 23:35:15,043 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,046 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,054 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... [2020-11-29 23:35:15,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 23:35:15,063 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 23:35:15,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 23:35:15,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 23:35:15,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:15,128 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-29 23:35:15,128 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 23:35:15,129 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-29 23:35:15,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 23:35:15,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 23:35:15,129 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-29 23:35:15,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-29 23:35:15,513 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 23:35:15,513 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-29 23:35:15,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:15 BoogieIcfgContainer [2020-11-29 23:35:15,515 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 23:35:15,517 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 23:35:15,517 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 23:35:15,520 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 23:35:15,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 11:35:14" (1/3) ... [2020-11-29 23:35:15,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45826fe0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:35:15, skipping insertion in model container [2020-11-29 23:35:15,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:14" (2/3) ... [2020-11-29 23:35:15,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45826fe0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:35:15, skipping insertion in model container [2020-11-29 23:35:15,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:15" (3/3) ... [2020-11-29 23:35:15,524 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-29 23:35:15,534 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 23:35:15,539 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-29 23:35:15,550 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-29 23:35:15,571 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 23:35:15,571 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-29 23:35:15,572 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 23:35:15,572 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 23:35:15,572 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 23:35:15,572 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 23:35:15,572 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 23:35:15,572 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 23:35:15,586 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-29 23:35:15,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-29 23:35:15,592 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:15,592 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:35:15,593 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:15,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:15,599 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-11-29 23:35:15,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:15,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968001355] [2020-11-29 23:35:15,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:15,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:15,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:15,763 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968001355] [2020-11-29 23:35:15,764 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:15,764 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-29 23:35:15,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589950662] [2020-11-29 23:35:15,771 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-29 23:35:15,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:15,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-29 23:35:15,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 23:35:15,790 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-11-29 23:35:15,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:15,812 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-11-29 23:35:15,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 23:35:15,814 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-11-29 23:35:15,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:15,828 INFO L225 Difference]: With dead ends: 53 [2020-11-29 23:35:15,828 INFO L226 Difference]: Without dead ends: 24 [2020-11-29 23:35:15,832 INFO L677 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 [2020-11-29 23:35:15,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-29 23:35:15,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-29 23:35:15,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-29 23:35:15,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-29 23:35:15,872 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-11-29 23:35:15,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:15,873 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-29 23:35:15,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-29 23:35:15,874 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-29 23:35:15,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-29 23:35:15,875 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:15,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:35:15,876 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-29 23:35:15,877 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:15,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:15,878 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-11-29 23:35:15,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:15,879 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956117010] [2020-11-29 23:35:15,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:15,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:15,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:15,987 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956117010] [2020-11-29 23:35:15,987 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:15,987 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-29 23:35:15,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482097813] [2020-11-29 23:35:15,989 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-29 23:35:15,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:15,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-29 23:35:15,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-29 23:35:15,997 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 3 states. [2020-11-29 23:35:16,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:16,078 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2020-11-29 23:35:16,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-29 23:35:16,080 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-11-29 23:35:16,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:16,082 INFO L225 Difference]: With dead ends: 56 [2020-11-29 23:35:16,082 INFO L226 Difference]: Without dead ends: 36 [2020-11-29 23:35:16,083 INFO L677 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 [2020-11-29 23:35:16,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-11-29 23:35:16,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2020-11-29 23:35:16,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-29 23:35:16,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2020-11-29 23:35:16,093 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 20 [2020-11-29 23:35:16,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:16,093 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2020-11-29 23:35:16,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-29 23:35:16,094 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2020-11-29 23:35:16,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-11-29 23:35:16,095 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:16,096 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:35:16,096 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-29 23:35:16,097 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:16,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:16,099 INFO L82 PathProgramCache]: Analyzing trace with hash -903714569, now seen corresponding path program 1 times [2020-11-29 23:35:16,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:16,100 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544638555] [2020-11-29 23:35:16,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:16,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:16,181 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-29 23:35:16,181 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544638555] [2020-11-29 23:35:16,181 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878629634] [2020-11-29 23:35:16,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:16,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-29 23:35:16,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:16,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-29 23:35:16,321 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:16,321 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-11-29 23:35:16,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850991248] [2020-11-29 23:35:16,322 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 23:35:16,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:16,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 23:35:16,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-29 23:35:16,323 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 5 states. [2020-11-29 23:35:16,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:16,411 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2020-11-29 23:35:16,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 23:35:16,414 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-11-29 23:35:16,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:16,415 INFO L225 Difference]: With dead ends: 69 [2020-11-29 23:35:16,415 INFO L226 Difference]: Without dead ends: 48 [2020-11-29 23:35:16,416 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-29 23:35:16,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-11-29 23:35:16,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 30. [2020-11-29 23:35:16,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-29 23:35:16,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-11-29 23:35:16,422 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-11-29 23:35:16,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:16,426 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-11-29 23:35:16,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 23:35:16,426 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-11-29 23:35:16,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-29 23:35:16,429 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:16,429 INFO L422 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, 1, 1] [2020-11-29 23:35:16,629 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-29 23:35:16,630 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:16,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:16,630 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 2 times [2020-11-29 23:35:16,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:16,631 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107429824] [2020-11-29 23:35:16,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:16,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:16,696 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 23:35:16,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107429824] [2020-11-29 23:35:16,697 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424700536] [2020-11-29 23:35:16,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:16,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-29 23:35:16,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 23:35:16,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 23:35:16,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:16,795 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 23:35:16,795 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:16,796 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-11-29 23:35:16,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580016162] [2020-11-29 23:35:16,796 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 23:35:16,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:16,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 23:35:16,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-29 23:35:16,798 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-11-29 23:35:16,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:16,912 INFO L93 Difference]: Finished difference Result 83 states and 97 transitions. [2020-11-29 23:35:16,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 23:35:16,913 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-11-29 23:35:16,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:16,914 INFO L225 Difference]: With dead ends: 83 [2020-11-29 23:35:16,915 INFO L226 Difference]: Without dead ends: 60 [2020-11-29 23:35:16,915 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-29 23:35:16,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-11-29 23:35:16,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 34. [2020-11-29 23:35:16,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-29 23:35:16,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-11-29 23:35:16,927 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-11-29 23:35:16,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:16,928 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-11-29 23:35:16,928 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 23:35:16,928 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-11-29 23:35:16,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-29 23:35:16,929 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:16,929 INFO L422 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, 1, 1] [2020-11-29 23:35:17,148 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 23:35:17,149 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:17,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:17,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1134626249, now seen corresponding path program 3 times [2020-11-29 23:35:17,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:17,150 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116683659] [2020-11-29 23:35:17,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:17,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:17,253 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-29 23:35:17,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116683659] [2020-11-29 23:35:17,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074561356] [2020-11-29 23:35:17,253 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:17,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-29 23:35:17,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 23:35:17,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-29 23:35:17,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:17,364 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-29 23:35:17,364 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:17,364 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-11-29 23:35:17,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143917714] [2020-11-29 23:35:17,365 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-29 23:35:17,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:17,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-29 23:35:17,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-29 23:35:17,375 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-11-29 23:35:17,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:17,474 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2020-11-29 23:35:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-29 23:35:17,475 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-11-29 23:35:17,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:17,476 INFO L225 Difference]: With dead ends: 97 [2020-11-29 23:35:17,476 INFO L226 Difference]: Without dead ends: 72 [2020-11-29 23:35:17,477 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-29 23:35:17,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-11-29 23:35:17,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 38. [2020-11-29 23:35:17,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-29 23:35:17,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-11-29 23:35:17,487 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-11-29 23:35:17,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:17,488 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-11-29 23:35:17,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-29 23:35:17,488 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-11-29 23:35:17,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-29 23:35:17,489 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:17,489 INFO L422 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, 1, 1] [2020-11-29 23:35:17,714 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 23:35:17,715 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:17,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:17,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1796619607, now seen corresponding path program 4 times [2020-11-29 23:35:17,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:17,715 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866212416] [2020-11-29 23:35:17,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:17,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:17,806 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-29 23:35:17,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866212416] [2020-11-29 23:35:17,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1692889615] [2020-11-29 23:35:17,807 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:17,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-29 23:35:17,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 23:35:17,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-29 23:35:17,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:17,909 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-29 23:35:17,910 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:17,910 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-11-29 23:35:17,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373717542] [2020-11-29 23:35:17,910 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-29 23:35:17,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 23:35:17,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-29 23:35:17,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-11-29 23:35:17,911 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2020-11-29 23:35:18,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:18,028 INFO L93 Difference]: Finished difference Result 109 states and 125 transitions. [2020-11-29 23:35:18,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-29 23:35:18,030 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2020-11-29 23:35:18,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:18,031 INFO L225 Difference]: With dead ends: 109 [2020-11-29 23:35:18,031 INFO L226 Difference]: Without dead ends: 82 [2020-11-29 23:35:18,032 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-11-29 23:35:18,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-11-29 23:35:18,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 42. [2020-11-29 23:35:18,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-29 23:35:18,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-11-29 23:35:18,043 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-11-29 23:35:18,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:18,043 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-11-29 23:35:18,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-29 23:35:18,044 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-11-29 23:35:18,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-29 23:35:18,046 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:18,047 INFO L422 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, 1, 1] [2020-11-29 23:35:18,251 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 23:35:18,252 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:18,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:18,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1749493623, now seen corresponding path program 5 times [2020-11-29 23:35:18,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 23:35:18,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966514160] [2020-11-29 23:35:18,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 23:35:18,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:35:18,328 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:35:18,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:35:18,385 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:35:18,408 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 23:35:18,408 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-29 23:35:18,408 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-29 23:35:18,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 11:35:18 BoogieIcfgContainer [2020-11-29 23:35:18,466 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 23:35:18,467 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 23:35:18,467 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 23:35:18,467 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 23:35:18,468 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:15" (3/4) ... [2020-11-29 23:35:18,470 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-29 23:35:18,470 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 23:35:18,472 INFO L168 Benchmark]: Toolchain (without parser) took 3821.24 ms. Allocated memory was 83.9 MB in the beginning and 130.0 MB in the end (delta: 46.1 MB). Free memory was 50.1 MB in the beginning and 76.3 MB in the end (delta: -26.2 MB). Peak memory consumption was 19.4 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,472 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 83.9 MB. Free memory was 63.5 MB in the beginning and 63.5 MB in the end (delta: 25.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 23:35:18,473 INFO L168 Benchmark]: CACSL2BoogieTranslator took 341.89 ms. Allocated memory is still 83.9 MB. Free memory was 49.9 MB in the beginning and 60.3 MB in the end (delta: -10.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,474 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.63 ms. Allocated memory is still 83.9 MB. Free memory was 60.3 MB in the beginning and 58.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,474 INFO L168 Benchmark]: Boogie Preprocessor took 28.44 ms. Allocated memory is still 83.9 MB. Free memory was 58.5 MB in the beginning and 57.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,475 INFO L168 Benchmark]: RCFGBuilder took 451.83 ms. Allocated memory was 83.9 MB in the beginning and 107.0 MB in the end (delta: 23.1 MB). Free memory was 57.3 MB in the beginning and 84.7 MB in the end (delta: -27.5 MB). Peak memory consumption was 18.7 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,476 INFO L168 Benchmark]: TraceAbstraction took 2949.53 ms. Allocated memory was 107.0 MB in the beginning and 130.0 MB in the end (delta: 23.1 MB). Free memory was 84.2 MB in the beginning and 77.3 MB in the end (delta: 6.9 MB). Peak memory consumption was 28.8 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,476 INFO L168 Benchmark]: Witness Printer took 3.41 ms. Allocated memory is still 130.0 MB. Free memory was 77.3 MB in the beginning and 76.3 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:18,480 INFO L339 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 83.9 MB. Free memory was 63.5 MB in the beginning and 63.5 MB in the end (delta: 25.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 341.89 ms. Allocated memory is still 83.9 MB. Free memory was 49.9 MB in the beginning and 60.3 MB in the end (delta: -10.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.63 ms. Allocated memory is still 83.9 MB. Free memory was 60.3 MB in the beginning and 58.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.44 ms. Allocated memory is still 83.9 MB. Free memory was 58.5 MB in the beginning and 57.3 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 451.83 ms. Allocated memory was 83.9 MB in the beginning and 107.0 MB in the end (delta: 23.1 MB). Free memory was 57.3 MB in the beginning and 84.7 MB in the end (delta: -27.5 MB). Peak memory consumption was 18.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2949.53 ms. Allocated memory was 107.0 MB in the beginning and 130.0 MB in the end (delta: 23.1 MB). Free memory was 84.2 MB in the beginning and 77.3 MB in the end (delta: 6.9 MB). Peak memory consumption was 28.8 MB. Max. memory is 16.1 GB. * Witness Printer took 3.41 ms. Allocated memory is still 130.0 MB. Free memory was 77.3 MB in the beginning and 76.3 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] 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_67d673f0-b267-4f95-8105-a330f6587702/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(reach_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 -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-11-29 23:35:21,691 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 23:35:21,717 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 23:35:21,719 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 23:35:21,720 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 23:35:21,722 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 23:35:21,723 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2020-11-29 23:35:21,801 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/16ff736e6/5b838efb8abd43ef94034cae4141fdf2/FLAG5d38b81de [2020-11-29 23:35:22,383 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 23:35:22,388 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/sv-benchmarks/c/loops/string-2.i [2020-11-29 23:35:22,395 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/16ff736e6/5b838efb8abd43ef94034cae4141fdf2/FLAG5d38b81de [2020-11-29 23:35:22,730 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/data/16ff736e6/5b838efb8abd43ef94034cae4141fdf2 [2020-11-29 23:35:22,734 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 23:35:22,736 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 23:35:22,740 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 23:35:22,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 23:35:22,745 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 23:35:22,746 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:35:22" (1/1) ... [2020-11-29 23:35:22,751 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@573fe10b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:22, skipping insertion in model container [2020-11-29 23:35:22,752 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 11:35:22" (1/1) ... [2020-11-29 23:35:22,760 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 23:35:22,780 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 23:35:22,982 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:35:22,993 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 23:35:23,040 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 23:35:23,064 INFO L208 MainTranslator]: Completed translation [2020-11-29 23:35:23,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23 WrapperNode [2020-11-29 23:35:23,066 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 23:35:23,068 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 23:35:23,068 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 23:35:23,070 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 23:35:23,078 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,110 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,150 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 23:35:23,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 23:35:23,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 23:35:23,152 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 23:35:23,160 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,176 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,179 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... [2020-11-29 23:35:23,181 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 23:35:23,182 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 23:35:23,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 23:35:23,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 23:35:23,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/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 [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 23:35:23,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-11-29 23:35:23,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-29 23:35:23,685 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 23:35:23,689 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-29 23:35:23,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:23 BoogieIcfgContainer [2020-11-29 23:35:23,691 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 23:35:23,692 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 23:35:23,693 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 23:35:23,696 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 23:35:23,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 11:35:22" (1/3) ... [2020-11-29 23:35:23,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ab12687 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:35:23, skipping insertion in model container [2020-11-29 23:35:23,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 11:35:23" (2/3) ... [2020-11-29 23:35:23,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ab12687 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 11:35:23, skipping insertion in model container [2020-11-29 23:35:23,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:23" (3/3) ... [2020-11-29 23:35:23,699 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-11-29 23:35:23,710 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 23:35:23,714 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-29 23:35:23,725 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-29 23:35:23,747 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 23:35:23,747 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-29 23:35:23,747 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 23:35:23,747 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 23:35:23,748 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 23:35:23,748 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 23:35:23,748 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 23:35:23,748 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 23:35:23,759 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-29 23:35:23,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-29 23:35:23,762 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:23,763 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:35:23,763 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:23,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:23,769 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-11-29 23:35:23,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:23,782 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1654114531] [2020-11-29 23:35:23,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:23,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:23,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-11-29 23:35:23,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:23,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:23,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:23,948 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1654114531] [2020-11-29 23:35:23,949 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:23,949 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2020-11-29 23:35:23,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362062453] [2020-11-29 23:35:23,954 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-29 23:35:23,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:23,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-29 23:35:23,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 23:35:23,970 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-11-29 23:35:23,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:23,988 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-11-29 23:35:23,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 23:35:23,989 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-11-29 23:35:23,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:24,009 INFO L225 Difference]: With dead ends: 53 [2020-11-29 23:35:24,009 INFO L226 Difference]: Without dead ends: 24 [2020-11-29 23:35:24,012 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 23:35:24,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-29 23:35:24,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-29 23:35:24,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-29 23:35:24,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-29 23:35:24,046 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-11-29 23:35:24,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:24,047 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-29 23:35:24,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-29 23:35:24,048 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-29 23:35:24,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-29 23:35:24,049 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:24,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 23:35:24,271 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-11-29 23:35:24,272 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:24,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:24,275 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-11-29 23:35:24,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:24,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [896726280] [2020-11-29 23:35:24,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:24,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:24,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 23:35:24,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:24,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:24,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:24,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 23:35:24,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [896726280] [2020-11-29 23:35:24,410 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:24,410 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2020-11-29 23:35:24,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693630558] [2020-11-29 23:35:24,412 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-29 23:35:24,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:24,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 23:35:24,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-29 23:35:24,413 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2020-11-29 23:35:24,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:24,548 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2020-11-29 23:35:24,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 23:35:24,549 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-11-29 23:35:24,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:24,552 INFO L225 Difference]: With dead ends: 66 [2020-11-29 23:35:24,552 INFO L226 Difference]: Without dead ends: 46 [2020-11-29 23:35:24,553 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-29 23:35:24,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-29 23:35:24,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 30. [2020-11-29 23:35:24,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-29 23:35:24,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-11-29 23:35:24,561 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 20 [2020-11-29 23:35:24,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:24,561 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-11-29 23:35:24,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-29 23:35:24,562 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-11-29 23:35:24,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-29 23:35:24,563 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:24,563 INFO L422 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, 1, 1] [2020-11-29 23:35:24,777 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-11-29 23:35:24,778 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:24,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:24,778 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 1 times [2020-11-29 23:35:24,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:24,779 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1933902616] [2020-11-29 23:35:24,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:24,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:24,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 23:35:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:24,912 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 23:35:24,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:25,073 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 23:35:25,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1933902616] [2020-11-29 23:35:25,073 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:25,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2020-11-29 23:35:25,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355625574] [2020-11-29 23:35:25,074 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-29 23:35:25,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:25,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-29 23:35:25,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2020-11-29 23:35:25,076 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 9 states. [2020-11-29 23:35:25,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:25,543 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2020-11-29 23:35:25,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-29 23:35:25,545 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-11-29 23:35:25,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:25,547 INFO L225 Difference]: With dead ends: 105 [2020-11-29 23:35:25,547 INFO L226 Difference]: Without dead ends: 82 [2020-11-29 23:35:25,548 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2020-11-29 23:35:25,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-11-29 23:35:25,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 42. [2020-11-29 23:35:25,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-29 23:35:25,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-11-29 23:35:25,560 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2020-11-29 23:35:25,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:25,561 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-11-29 23:35:25,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-29 23:35:25,561 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-11-29 23:35:25,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-29 23:35:25,564 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:25,564 INFO L422 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, 1, 1] [2020-11-29 23:35:25,782 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3 [2020-11-29 23:35:25,782 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:25,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:25,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1749493623, now seen corresponding path program 2 times [2020-11-29 23:35:25,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:25,784 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [721088446] [2020-11-29 23:35:25,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 5 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:25,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-11-29 23:35:25,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 23:35:25,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-29 23:35:25,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:25,917 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-11-29 23:35:25,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:25,934 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-11-29 23:35:26,042 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-11-29 23:35:26,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [721088446] [2020-11-29 23:35:26,044 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:26,045 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2020-11-29 23:35:26,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681157123] [2020-11-29 23:35:26,045 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 23:35:26,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:26,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 23:35:26,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-29 23:35:26,048 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 6 states. [2020-11-29 23:35:26,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:26,194 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-11-29 23:35:26,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 23:35:26,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-11-29 23:35:26,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:26,196 INFO L225 Difference]: With dead ends: 50 [2020-11-29 23:35:26,196 INFO L226 Difference]: Without dead ends: 44 [2020-11-29 23:35:26,197 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-29 23:35:26,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-29 23:35:26,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-11-29 23:35:26,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-11-29 23:35:26,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2020-11-29 23:35:26,204 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 40 [2020-11-29 23:35:26,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:26,205 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2020-11-29 23:35:26,205 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 23:35:26,205 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2020-11-29 23:35:26,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-11-29 23:35:26,206 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:26,206 INFO L422 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, 1, 1, 1, 1] [2020-11-29 23:35:26,407 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 mathsat -unsat_core_generation=3 [2020-11-29 23:35:26,407 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:26,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:26,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1230012070, now seen corresponding path program 1 times [2020-11-29 23:35:26,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:26,408 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1326907810] [2020-11-29 23:35:26,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 6 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:26,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:26,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 23:35:26,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:26,533 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-11-29 23:35:26,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:26,564 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-11-29 23:35:26,564 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1326907810] [2020-11-29 23:35:26,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-11-29 23:35:26,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2020-11-29 23:35:26,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83330629] [2020-11-29 23:35:26,565 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 23:35:26,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:26,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 23:35:26,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-11-29 23:35:26,567 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 6 states. [2020-11-29 23:35:26,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:26,660 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-11-29 23:35:26,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 23:35:26,662 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2020-11-29 23:35:26,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:26,663 INFO L225 Difference]: With dead ends: 58 [2020-11-29 23:35:26,663 INFO L226 Difference]: Without dead ends: 45 [2020-11-29 23:35:26,664 INFO L677 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 [2020-11-29 23:35:26,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-29 23:35:26,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-11-29 23:35:26,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-11-29 23:35:26,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2020-11-29 23:35:26,676 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 42 [2020-11-29 23:35:26,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:26,676 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2020-11-29 23:35:26,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 23:35:26,676 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2020-11-29 23:35:26,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-11-29 23:35:26,678 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:26,678 INFO L422 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, 1, 1] [2020-11-29 23:35:26,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 mathsat -unsat_core_generation=3 [2020-11-29 23:35:26,897 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:26,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:26,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1377858369, now seen corresponding path program 1 times [2020-11-29 23:35:26,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:26,898 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1275490977] [2020-11-29 23:35:26,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:26,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 23:35:26,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 23:35:26,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 23:35:27,038 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2020-11-29 23:35:27,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-29 23:35:27,089 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2020-11-29 23:35:27,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1275490977] [2020-11-29 23:35:27,092 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 23:35:27,092 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-11-29 23:35:27,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000278181] [2020-11-29 23:35:27,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-29 23:35:27,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-11-29 23:35:27,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-29 23:35:27,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-11-29 23:35:27,099 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand 8 states. [2020-11-29 23:35:27,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 23:35:27,333 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2020-11-29 23:35:27,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-29 23:35:27,334 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 44 [2020-11-29 23:35:27,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 23:35:27,335 INFO L225 Difference]: With dead ends: 108 [2020-11-29 23:35:27,335 INFO L226 Difference]: Without dead ends: 96 [2020-11-29 23:35:27,336 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2020-11-29 23:35:27,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-11-29 23:35:27,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 54. [2020-11-29 23:35:27,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-11-29 23:35:27,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2020-11-29 23:35:27,356 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 44 [2020-11-29 23:35:27,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 23:35:27,356 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2020-11-29 23:35:27,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-29 23:35:27,358 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2020-11-29 23:35:27,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-29 23:35:27,361 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 23:35:27,361 INFO L422 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, 1, 1] [2020-11-29 23:35:27,561 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 mathsat -unsat_core_generation=3 [2020-11-29 23:35:27,562 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 23:35:27,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 23:35:27,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1658933818, now seen corresponding path program 1 times [2020-11-29 23:35:27,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-11-29 23:35:27,563 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1780016935] [2020-11-29 23:35:27,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/mathsat Starting monitored process 8 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with mathsat -unsat_core_generation=3 [2020-11-29 23:35:27,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:35:27,741 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:35:27,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 23:35:27,899 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 23:35:27,992 INFO L173 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2020-11-29 23:35:27,993 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-29 23:35:28,202 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 mathsat -unsat_core_generation=3 [2020-11-29 23:35:28,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 11:35:28 BoogieIcfgContainer [2020-11-29 23:35:28,270 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 23:35:28,270 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 23:35:28,270 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 23:35:28,271 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 23:35:28,271 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 11:35:23" (3/4) ... [2020-11-29 23:35:28,274 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-29 23:35:28,351 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_67d673f0-b267-4f95-8105-a330f6587702/bin/uautomizer/witness.graphml [2020-11-29 23:35:28,354 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 23:35:28,359 INFO L168 Benchmark]: Toolchain (without parser) took 5619.69 ms. Allocated memory was 62.9 MB in the beginning and 81.8 MB in the end (delta: 18.9 MB). Free memory was 43.0 MB in the beginning and 33.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 26.5 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,359 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 62.9 MB. Free memory is still 44.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 23:35:28,360 INFO L168 Benchmark]: CACSL2BoogieTranslator took 326.35 ms. Allocated memory is still 62.9 MB. Free memory was 42.8 MB in the beginning and 32.0 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,360 INFO L168 Benchmark]: Boogie Procedure Inliner took 82.69 ms. Allocated memory is still 62.9 MB. Free memory was 32.0 MB in the beginning and 45.3 MB in the end (delta: -13.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,361 INFO L168 Benchmark]: Boogie Preprocessor took 30.52 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 43.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 23:35:28,361 INFO L168 Benchmark]: RCFGBuilder took 508.70 ms. Allocated memory is still 62.9 MB. Free memory was 43.9 MB in the beginning and 44.1 MB in the end (delta: -115.6 kB). Peak memory consumption was 20.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,362 INFO L168 Benchmark]: TraceAbstraction took 4577.29 ms. Allocated memory was 62.9 MB in the beginning and 81.8 MB in the end (delta: 18.9 MB). Free memory was 43.8 MB in the beginning and 37.1 MB in the end (delta: 6.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,362 INFO L168 Benchmark]: Witness Printer took 84.84 ms. Allocated memory is still 81.8 MB. Free memory was 37.1 MB in the beginning and 33.7 MB in the end (delta: 3.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 23:35:28,365 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 62.9 MB. Free memory is still 44.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 326.35 ms. Allocated memory is still 62.9 MB. Free memory was 42.8 MB in the beginning and 32.0 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 82.69 ms. Allocated memory is still 62.9 MB. Free memory was 32.0 MB in the beginning and 45.3 MB in the end (delta: -13.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 30.52 ms. Allocated memory is still 62.9 MB. Free memory was 45.3 MB in the beginning and 43.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 508.70 ms. Allocated memory is still 62.9 MB. Free memory was 43.9 MB in the beginning and 44.1 MB in the end (delta: -115.6 kB). Peak memory consumption was 20.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4577.29 ms. Allocated memory was 62.9 MB in the beginning and 81.8 MB in the end (delta: 18.9 MB). Free memory was 43.8 MB in the beginning and 37.1 MB in the end (delta: 6.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 16.1 GB. * Witness Printer took 84.84 ms. Allocated memory is still 81.8 MB. Free memory was 37.1 MB in the beginning and 33.7 MB in the end (delta: 3.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND TRUE string_A[nc_A]!='\0' [L45] nc_A++ [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND TRUE string_B[nc_B]!='\0' [L49] nc_B++ [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND TRUE (inc_B-1)<