./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/skippedu.c --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_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-tiling/skippedu.c -s /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/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 188f1f6278f7b64d732f6e67466f6eb857ea2297 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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 20:29:21,964 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 20:29:21,985 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 20:29:22,047 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 20:29:22,048 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 20:29:22,050 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 20:29:22,052 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 20:29:22,056 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 20:29:22,059 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 20:29:22,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 20:29:22,062 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 20:29:22,065 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 20:29:22,065 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 20:29:22,067 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 20:29:22,069 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 20:29:22,071 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 20:29:22,073 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 20:29:22,074 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 20:29:22,078 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 20:29:22,081 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 20:29:22,086 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 20:29:22,089 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 20:29:22,092 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 20:29:22,094 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 20:29:22,105 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 20:29:22,109 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 20:29:22,110 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 20:29:22,115 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 20:29:22,120 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 20:29:22,121 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 20:29:22,122 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 20:29:22,123 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 20:29:22,125 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 20:29:22,128 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 20:29:22,130 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 20:29:22,131 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 20:29:22,132 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 20:29:22,132 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 20:29:22,133 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 20:29:22,134 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 20:29:22,135 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 20:29:22,139 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-29 20:29:22,186 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 20:29:22,187 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 20:29:22,190 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 20:29:22,190 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 20:29:22,191 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 20:29:22,191 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 20:29:22,192 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-29 20:29:22,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 20:29:22,192 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-29 20:29:22,193 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 20:29:22,194 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-29 20:29:22,195 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-29 20:29:22,195 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-29 20:29:22,195 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-29 20:29:22,196 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 20:29:22,196 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 20:29:22,197 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-29 20:29:22,197 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 20:29:22,198 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 20:29:22,198 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-29 20:29:22,198 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-29 20:29:22,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-29 20:29:22,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 20:29:22,200 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-29 20:29:22,200 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-29 20:29:22,200 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 20:29:22,201 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-29 20:29:22,201 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-29 20:29:22,202 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 20:29:22,202 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_998bfbef-61b6-4896-b3ff-a6fb58edadf1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 188f1f6278f7b64d732f6e67466f6eb857ea2297 [2020-11-29 20:29:22,580 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 20:29:22,609 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 20:29:22,612 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 20:29:22,614 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 20:29:22,615 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 20:29:22,617 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/../../sv-benchmarks/c/array-tiling/skippedu.c [2020-11-29 20:29:22,698 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/data/d17efa649/098f1f59c18d460cb161eb397bee7867/FLAG39f25109a [2020-11-29 20:29:23,362 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 20:29:23,364 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/sv-benchmarks/c/array-tiling/skippedu.c [2020-11-29 20:29:23,371 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/data/d17efa649/098f1f59c18d460cb161eb397bee7867/FLAG39f25109a [2020-11-29 20:29:23,690 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/data/d17efa649/098f1f59c18d460cb161eb397bee7867 [2020-11-29 20:29:23,693 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 20:29:23,699 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 20:29:23,703 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 20:29:23,703 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 20:29:23,707 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 20:29:23,709 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 08:29:23" (1/1) ... [2020-11-29 20:29:23,711 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71ff19f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:23, skipping insertion in model container [2020-11-29 20:29:23,712 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 08:29:23" (1/1) ... [2020-11-29 20:29:23,720 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 20:29:23,741 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 20:29:24,026 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 20:29:24,045 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 20:29:24,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 20:29:24,111 INFO L208 MainTranslator]: Completed translation [2020-11-29 20:29:24,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24 WrapperNode [2020-11-29 20:29:24,112 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 20:29:24,114 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 20:29:24,114 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 20:29:24,115 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 20:29:24,126 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,135 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,160 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 20:29:24,161 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 20:29:24,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 20:29:24,161 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 20:29:24,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,175 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,175 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,199 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,201 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... [2020-11-29 20:29:24,206 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 20:29:24,207 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 20:29:24,207 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 20:29:24,208 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 20:29:24,209 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/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 20:29:24,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-29 20:29:24,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 20:29:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-29 20:29:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-29 20:29:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 20:29:24,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 20:29:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-29 20:29:24,869 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 20:29:24,869 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-29 20:29:24,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:29:24 BoogieIcfgContainer [2020-11-29 20:29:24,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 20:29:24,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 20:29:24,877 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 20:29:24,881 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 20:29:24,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 08:29:23" (1/3) ... [2020-11-29 20:29:24,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7874f7c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 08:29:24, skipping insertion in model container [2020-11-29 20:29:24,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:29:24" (2/3) ... [2020-11-29 20:29:24,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7874f7c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 08:29:24, skipping insertion in model container [2020-11-29 20:29:24,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:29:24" (3/3) ... [2020-11-29 20:29:24,885 INFO L111 eAbstractionObserver]: Analyzing ICFG skippedu.c [2020-11-29 20:29:24,898 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 20:29:24,903 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-29 20:29:24,916 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-29 20:29:24,957 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 20:29:24,958 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-29 20:29:24,958 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 20:29:24,958 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 20:29:24,958 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 20:29:24,958 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 20:29:24,959 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 20:29:24,959 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 20:29:24,980 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-11-29 20:29:24,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-29 20:29:24,986 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:24,986 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:24,987 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:24,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:24,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1607783550, now seen corresponding path program 1 times [2020-11-29 20:29:25,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:25,005 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582198379] [2020-11-29 20:29:25,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:25,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:25,198 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 20:29:25,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582198379] [2020-11-29 20:29:25,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:29:25,201 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-29 20:29:25,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600824829] [2020-11-29 20:29:25,206 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-29 20:29:25,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:29:25,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-29 20:29:25,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 20:29:25,233 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-11-29 20:29:25,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:29:25,255 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2020-11-29 20:29:25,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 20:29:25,256 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-11-29 20:29:25,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:29:25,274 INFO L225 Difference]: With dead ends: 44 [2020-11-29 20:29:25,274 INFO L226 Difference]: Without dead ends: 20 [2020-11-29 20:29:25,284 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 20:29:25,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-29 20:29:25,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-11-29 20:29:25,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-29 20:29:25,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-11-29 20:29:25,329 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 12 [2020-11-29 20:29:25,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:29:25,331 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-11-29 20:29:25,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-29 20:29:25,332 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-11-29 20:29:25,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-29 20:29:25,333 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:25,333 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:25,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-29 20:29:25,334 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:25,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:25,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1872951298, now seen corresponding path program 1 times [2020-11-29 20:29:25,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:25,339 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601648851] [2020-11-29 20:29:25,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:25,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:25,452 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 20:29:25,453 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601648851] [2020-11-29 20:29:25,453 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:29:25,453 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-29 20:29:25,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640141515] [2020-11-29 20:29:25,455 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-29 20:29:25,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:29:25,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-29 20:29:25,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-29 20:29:25,457 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2020-11-29 20:29:25,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:29:25,538 INFO L93 Difference]: Finished difference Result 37 states and 45 transitions. [2020-11-29 20:29:25,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-29 20:29:25,539 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-11-29 20:29:25,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:29:25,540 INFO L225 Difference]: With dead ends: 37 [2020-11-29 20:29:25,540 INFO L226 Difference]: Without dead ends: 22 [2020-11-29 20:29:25,541 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 20:29:25,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-11-29 20:29:25,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-11-29 20:29:25,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-29 20:29:25,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-11-29 20:29:25,547 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2020-11-29 20:29:25,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:29:25,547 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-11-29 20:29:25,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-29 20:29:25,547 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-11-29 20:29:25,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-29 20:29:25,548 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:25,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:25,549 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-29 20:29:25,549 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:25,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:25,549 INFO L82 PathProgramCache]: Analyzing trace with hash -270152420, now seen corresponding path program 1 times [2020-11-29 20:29:25,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:25,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797937] [2020-11-29 20:29:25,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:25,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:25,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:29:25,639 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797937] [2020-11-29 20:29:25,639 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634321462] [2020-11-29 20:29:25,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/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 20:29:25,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:25,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 20:29:25,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:29:25,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:29:25,823 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:29:25,824 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-11-29 20:29:25,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252587631] [2020-11-29 20:29:25,824 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 20:29:25,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:29:25,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 20:29:25,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-29 20:29:25,826 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-11-29 20:29:25,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:29:25,965 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-11-29 20:29:25,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 20:29:25,966 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-11-29 20:29:25,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:29:25,967 INFO L225 Difference]: With dead ends: 39 [2020-11-29 20:29:25,967 INFO L226 Difference]: Without dead ends: 24 [2020-11-29 20:29:25,967 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-29 20:29:25,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-29 20:29:25,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-11-29 20:29:25,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-11-29 20:29:25,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-11-29 20:29:25,972 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2020-11-29 20:29:25,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:29:25,974 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-11-29 20:29:25,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 20:29:25,975 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-11-29 20:29:25,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-29 20:29:25,977 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:25,978 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:26,178 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-29 20:29:26,179 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:26,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:26,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1873689926, now seen corresponding path program 2 times [2020-11-29 20:29:26,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:26,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023897275] [2020-11-29 20:29:26,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:26,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:26,419 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 3 [2020-11-29 20:29:26,544 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 20:29:26,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023897275] [2020-11-29 20:29:26,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:29:26,545 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-29 20:29:26,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002111824] [2020-11-29 20:29:26,545 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 20:29:26,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:29:26,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 20:29:26,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-29 20:29:26,546 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2020-11-29 20:29:26,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:29:26,676 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-11-29 20:29:26,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 20:29:26,677 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-11-29 20:29:26,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:29:26,678 INFO L225 Difference]: With dead ends: 35 [2020-11-29 20:29:26,678 INFO L226 Difference]: Without dead ends: 28 [2020-11-29 20:29:26,679 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-29 20:29:26,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-29 20:29:26,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2020-11-29 20:29:26,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-29 20:29:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-11-29 20:29:26,684 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 16 [2020-11-29 20:29:26,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:29:26,687 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-11-29 20:29:26,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 20:29:26,688 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-11-29 20:29:26,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-29 20:29:26,690 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:26,690 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:26,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-29 20:29:26,691 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:26,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:26,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1095507628, now seen corresponding path program 1 times [2020-11-29 20:29:26,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:26,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319505112] [2020-11-29 20:29:26,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:26,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:27,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 20:29:27,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319505112] [2020-11-29 20:29:27,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234398264] [2020-11-29 20:29:27,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/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 20:29:27,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:29:27,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-29 20:29:27,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:29:27,132 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2020-11-29 20:29:27,133 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:29:27,143 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:29:27,143 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:29:27,144 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:20 [2020-11-29 20:29:27,184 INFO L350 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2020-11-29 20:29:27,185 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2020-11-29 20:29:27,186 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:29:27,194 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:29:27,195 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:29:27,195 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:19 [2020-11-29 20:29:27,290 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:29:27,299 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-29 20:29:27,376 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-29 20:29:27,376 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:29:27,376 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-11-29 20:29:27,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018231396] [2020-11-29 20:29:27,377 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-29 20:29:27,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:29:27,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-29 20:29:27,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-11-29 20:29:27,379 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 13 states. [2020-11-29 20:29:28,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:29:28,234 INFO L93 Difference]: Finished difference Result 78 states and 93 transitions. [2020-11-29 20:29:28,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-29 20:29:28,235 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-11-29 20:29:28,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:29:28,237 INFO L225 Difference]: With dead ends: 78 [2020-11-29 20:29:28,237 INFO L226 Difference]: Without dead ends: 76 [2020-11-29 20:29:28,238 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=157, Invalid=443, Unknown=0, NotChecked=0, Total=600 [2020-11-29 20:29:28,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-11-29 20:29:28,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 45. [2020-11-29 20:29:28,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-11-29 20:29:28,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2020-11-29 20:29:28,256 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 21 [2020-11-29 20:29:28,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:29:28,257 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2020-11-29 20:29:28,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-29 20:29:28,258 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2020-11-29 20:29:28,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-29 20:29:28,261 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:29:28,262 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:29:28,462 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:29:28,463 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:29:28,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:29:28,463 INFO L82 PathProgramCache]: Analyzing trace with hash -415449258, now seen corresponding path program 1 times [2020-11-29 20:29:28,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:29:28,464 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026321647] [2020-11-29 20:29:28,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:29:28,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 20:29:28,506 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 20:29:28,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 20:29:28,571 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 20:29:28,608 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 20:29:28,609 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-29 20:29:28,609 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-29 20:29:28,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 08:29:28 BoogieIcfgContainer [2020-11-29 20:29:28,687 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 20:29:28,687 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 20:29:28,687 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 20:29:28,687 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 20:29:28,688 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:29:24" (3/4) ... [2020-11-29 20:29:28,690 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-29 20:29:28,748 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_998bfbef-61b6-4896-b3ff-a6fb58edadf1/bin/uautomizer/witness.graphml [2020-11-29 20:29:28,748 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 20:29:28,750 INFO L168 Benchmark]: Toolchain (without parser) took 5054.67 ms. Allocated memory was 90.2 MB in the beginning and 134.2 MB in the end (delta: 44.0 MB). Free memory was 66.1 MB in the beginning and 76.7 MB in the end (delta: -10.6 MB). Peak memory consumption was 30.9 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,750 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 90.2 MB. Free memory was 54.1 MB in the beginning and 54.0 MB in the end (delta: 61.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 20:29:28,751 INFO L168 Benchmark]: CACSL2BoogieTranslator took 409.98 ms. Allocated memory is still 90.2 MB. Free memory was 65.9 MB in the beginning and 67.1 MB in the end (delta: -1.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,752 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.03 ms. Allocated memory is still 90.2 MB. Free memory was 66.8 MB in the beginning and 65.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,752 INFO L168 Benchmark]: Boogie Preprocessor took 45.68 ms. Allocated memory is still 90.2 MB. Free memory was 65.3 MB in the beginning and 64.2 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 20:29:28,753 INFO L168 Benchmark]: RCFGBuilder took 665.77 ms. Allocated memory is still 90.2 MB. Free memory was 64.0 MB in the beginning and 48.6 MB in the end (delta: 15.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,754 INFO L168 Benchmark]: TraceAbstraction took 3810.28 ms. Allocated memory was 90.2 MB in the beginning and 134.2 MB in the end (delta: 44.0 MB). Free memory was 48.2 MB in the beginning and 79.8 MB in the end (delta: -31.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,755 INFO L168 Benchmark]: Witness Printer took 61.30 ms. Allocated memory is still 134.2 MB. Free memory was 79.8 MB in the beginning and 76.7 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-29 20:29:28,758 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 90.2 MB. Free memory was 54.1 MB in the beginning and 54.0 MB in the end (delta: 61.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 409.98 ms. Allocated memory is still 90.2 MB. Free memory was 65.9 MB in the beginning and 67.1 MB in the end (delta: -1.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 46.03 ms. Allocated memory is still 90.2 MB. Free memory was 66.8 MB in the beginning and 65.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 45.68 ms. Allocated memory is still 90.2 MB. Free memory was 65.3 MB in the beginning and 64.2 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 665.77 ms. Allocated memory is still 90.2 MB. Free memory was 64.0 MB in the beginning and 48.6 MB in the end (delta: 15.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3810.28 ms. Allocated memory was 90.2 MB in the beginning and 134.2 MB in the end (delta: 44.0 MB). Free memory was 48.2 MB in the beginning and 79.8 MB in the end (delta: -31.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. * Witness Printer took 61.30 ms. Allocated memory is still 134.2 MB. Free memory was 79.8 MB in the beginning and 76.7 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int SIZE; [L14] const int MAX = 100000; VAL [MAX=100000, SIZE=0] [L18] SIZE = __VERIFIER_nondet_int() [L19] COND TRUE SIZE > 1 && SIZE < MAX [L21] int i; [L22] int *a = malloc(sizeof(int)*SIZE); [L24] i = 0 VAL [MAX=100000, SIZE=2] [L24] COND TRUE i < SIZE [L26] a[i] = __VERIFIER_nondet_int() [L24] i++ VAL [MAX=100000, SIZE=2] [L24] COND TRUE i < SIZE [L26] a[i] = __VERIFIER_nondet_int() [L24] i++ VAL [MAX=100000, SIZE=2] [L24] COND FALSE !(i < SIZE) VAL [MAX=100000, SIZE=2] [L29] COND FALSE !(SIZE % 2 != 0) [L6] COND FALSE !(!cond) VAL [MAX=100000, SIZE=2] [L32] i = 1 VAL [MAX=100000, SIZE=2] [L32] COND TRUE i <= SIZE/2 [L34] EXPR a[2*i-2] VAL [MAX=100000, SIZE=2] [L34] COND FALSE !(a[2*i-2] > i) [L38] EXPR a[2*i-1] VAL [MAX=100000, SIZE=2] [L38] COND TRUE a[2*i-1] > i [L40] a[2*i-1] = 2*i-1 VAL [MAX=100000, SIZE=2] [L32] i++ VAL [MAX=100000, SIZE=2] [L32] COND FALSE !(i <= SIZE/2) VAL [MAX=100000, SIZE=2] [L44] i = 0 VAL [MAX=100000, SIZE=2] [L44] COND TRUE i < SIZE [L46] a[i] [L8] COND TRUE !(cond) VAL [MAX=100000, SIZE=2] [L3] __assert_fail("0", "skippedu.c", 3, "reach_error") VAL [MAX=100000, SIZE=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.6s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 105 SDtfs, 188 SDslu, 121 SDs, 0 SdLazy, 289 SolverSat, 53 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 67 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 37 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 131 NumberOfCodeBlocks, 131 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 103 ConstructedInterpolants, 0 QuantifiedInterpolants, 7928 SizeOfPredicates, 10 NumberOfNonLiveVariables, 185 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 7 InterpolantComputations, 3 PerfectInterpolantSequences, 12/16 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...