./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.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_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 2879b5362dad4ee344e02d12e11f7b45d4f36399 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2020-11-28 03:09:47,619 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:09:47,621 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:09:47,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:09:47,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:09:47,701 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:09:47,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:09:47,705 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:09:47,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:09:47,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:09:47,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:09:47,710 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:09:47,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:09:47,714 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:09:47,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:09:47,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:09:47,720 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:09:47,721 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:09:47,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:09:47,728 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:09:47,732 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:09:47,733 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:09:47,735 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:09:47,736 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:09:47,748 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:09:47,748 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:09:47,749 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:09:47,751 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:09:47,751 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:09:47,753 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:09:47,753 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:09:47,754 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:09:47,756 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:09:47,758 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:09:47,759 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:09:47,759 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:09:47,760 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:09:47,761 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:09:47,761 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:09:47,762 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:09:47,763 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:09:47,765 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-28 03:09:47,811 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:09:47,811 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:09:47,816 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:09:47,816 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:09:47,816 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:09:47,816 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:09:47,817 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 03:09:47,817 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:09:47,817 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 03:09:47,817 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:09:47,818 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 03:09:47,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 03:09:47,819 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 03:09:47,819 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 03:09:47,819 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:09:47,819 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:09:47,819 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 03:09:47,820 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:09:47,820 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:09:47,820 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 03:09:47,820 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 03:09:47,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:09:47,821 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:09:47,821 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 03:09:47,821 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 03:09:47,822 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:09:47,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 03:09:47,822 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 03:09:47,822 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:09:47,822 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_be0e11a4-c904-4fa5-ae46-74a96179547a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2879b5362dad4ee344e02d12e11f7b45d4f36399 [2020-11-28 03:09:48,145 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:09:48,176 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:09:48,180 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:09:48,181 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:09:48,182 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:09:48,183 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-28 03:09:48,257 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/data/4bcad7ff5/ab57c76e960d4622b6eb0c6bc109a17b/FLAG27ef836f0 [2020-11-28 03:09:48,773 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:09:48,774 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-28 03:09:48,779 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/data/4bcad7ff5/ab57c76e960d4622b6eb0c6bc109a17b/FLAG27ef836f0 [2020-11-28 03:09:49,156 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/data/4bcad7ff5/ab57c76e960d4622b6eb0c6bc109a17b [2020-11-28 03:09:49,159 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:09:49,160 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:09:49,162 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:09:49,162 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:09:49,165 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:09:49,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,167 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32aa19b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49, skipping insertion in model container [2020-11-28 03:09:49,168 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,174 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:09:49,186 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:09:49,384 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:09:49,399 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:09:49,419 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:09:49,434 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:09:49,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49 WrapperNode [2020-11-28 03:09:49,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:09:49,440 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:09:49,440 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:09:49,440 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:09:49,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,460 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,477 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:09:49,478 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:09:49,479 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:09:49,479 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:09:49,487 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,487 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,489 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,489 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,494 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,497 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,504 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... [2020-11-28 03:09:49,506 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:09:49,508 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:09:49,508 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:09:49,508 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:09:49,509 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 [2020-11-28 03:09:49,581 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:09:49,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:09:49,582 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 03:09:49,582 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 03:09:49,886 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:09:49,886 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-28 03:09:49,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:09:49 BoogieIcfgContainer [2020-11-28 03:09:49,888 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:09:49,889 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 03:09:49,889 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 03:09:49,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 03:09:49,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 03:09:49" (1/3) ... [2020-11-28 03:09:49,894 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@675c6c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:09:49, skipping insertion in model container [2020-11-28 03:09:49,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:09:49" (2/3) ... [2020-11-28 03:09:49,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@675c6c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:09:49, skipping insertion in model container [2020-11-28 03:09:49,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:09:49" (3/3) ... [2020-11-28 03:09:49,897 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-11-28 03:09:49,907 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 03:09:49,911 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 03:09:49,922 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 03:09:49,957 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 03:09:49,957 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 03:09:49,957 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 03:09:49,958 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:09:49,958 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:09:49,958 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 03:09:49,958 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:09:49,958 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 03:09:49,973 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2020-11-28 03:09:49,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 03:09:49,978 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:49,979 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 03:09:49,979 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:49,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:49,985 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2020-11-28 03:09:49,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:49,994 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609892858] [2020-11-28 03:09:49,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:50,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:50,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:50,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609892858] [2020-11-28 03:09:50,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:09:50,274 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 03:09:50,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136015252] [2020-11-28 03:09:50,279 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 03:09:50,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:50,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 03:09:50,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 03:09:50,294 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 4 states. [2020-11-28 03:09:50,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:50,350 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2020-11-28 03:09:50,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:09:50,352 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2020-11-28 03:09:50,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:50,369 INFO L225 Difference]: With dead ends: 19 [2020-11-28 03:09:50,375 INFO L226 Difference]: Without dead ends: 8 [2020-11-28 03:09:50,377 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 03:09:50,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-11-28 03:09:50,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-11-28 03:09:50,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-11-28 03:09:50,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-11-28 03:09:50,411 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2020-11-28 03:09:50,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:50,411 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-11-28 03:09:50,411 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 03:09:50,412 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-11-28 03:09:50,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-28 03:09:50,413 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:50,413 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:50,413 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 03:09:50,414 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:50,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:50,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2020-11-28 03:09:50,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:50,418 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540117943] [2020-11-28 03:09:50,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:50,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:50,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:50,571 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540117943] [2020-11-28 03:09:50,571 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962465727] [2020-11-28 03:09:50,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 [2020-11-28 03:09:50,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:50,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-28 03:09:50,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:09:50,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:50,657 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:09:50,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-28 03:09:50,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139765841] [2020-11-28 03:09:50,659 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 03:09:50,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:50,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:09:50,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:09:50,660 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 6 states. [2020-11-28 03:09:50,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:50,682 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2020-11-28 03:09:50,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:09:50,682 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 7 [2020-11-28 03:09:50,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:50,683 INFO L225 Difference]: With dead ends: 13 [2020-11-28 03:09:50,683 INFO L226 Difference]: Without dead ends: 9 [2020-11-28 03:09:50,684 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:09:50,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-28 03:09:50,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-28 03:09:50,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-28 03:09:50,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-28 03:09:50,686 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2020-11-28 03:09:50,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:50,686 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-28 03:09:50,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 03:09:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-28 03:09:50,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-28 03:09:50,687 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:50,687 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:50,896 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 03:09:50,897 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:50,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:50,897 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2020-11-28 03:09:50,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:50,898 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628649322] [2020-11-28 03:09:50,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:50,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:51,002 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:51,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628649322] [2020-11-28 03:09:51,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99731007] [2020-11-28 03:09:51,009 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 [2020-11-28 03:09:51,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:09:51,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:09:51,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:09:51,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:09:51,140 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:51,140 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:09:51,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-11-28 03:09:51,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115245737] [2020-11-28 03:09:51,141 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 03:09:51,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:51,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 03:09:51,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:09:51,143 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 7 states. [2020-11-28 03:09:51,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:51,179 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-11-28 03:09:51,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:09:51,179 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2020-11-28 03:09:51,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:51,180 INFO L225 Difference]: With dead ends: 14 [2020-11-28 03:09:51,180 INFO L226 Difference]: Without dead ends: 10 [2020-11-28 03:09:51,181 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:09:51,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-28 03:09:51,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-11-28 03:09:51,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-28 03:09:51,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-11-28 03:09:51,184 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2020-11-28 03:09:51,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:51,184 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-11-28 03:09:51,184 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 03:09:51,184 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-11-28 03:09:51,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 03:09:51,185 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:51,185 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:51,396 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:09:51,397 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:51,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:51,397 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2020-11-28 03:09:51,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:51,398 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991191996] [2020-11-28 03:09:51,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:51,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:51,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991191996] [2020-11-28 03:09:51,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318851692] [2020-11-28 03:09:51,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 [2020-11-28 03:09:51,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 03:09:51,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:09:51,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-28 03:09:51,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:09:51,804 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:51,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:09:51,805 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-11-28 03:09:51,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764028077] [2020-11-28 03:09:51,806 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 03:09:51,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:51,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:09:51,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:09:51,810 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2020-11-28 03:09:51,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:51,861 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2020-11-28 03:09:51,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 03:09:51,861 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2020-11-28 03:09:51,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:51,862 INFO L225 Difference]: With dead ends: 15 [2020-11-28 03:09:51,862 INFO L226 Difference]: Without dead ends: 11 [2020-11-28 03:09:51,863 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:09:51,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-28 03:09:51,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-28 03:09:51,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:09:51,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-28 03:09:51,866 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2020-11-28 03:09:51,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:51,866 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-28 03:09:51,866 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 03:09:51,866 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-28 03:09:51,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 03:09:51,867 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:51,867 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:52,088 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:09:52,089 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:52,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:52,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2020-11-28 03:09:52,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:52,089 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505940803] [2020-11-28 03:09:52,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:52,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:52,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505940803] [2020-11-28 03:09:52,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144218497] [2020-11-28 03:09:52,262 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/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 [2020-11-28 03:09:52,317 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 03:09:52,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:09:52,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-28 03:09:52,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:09:52,385 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:52,386 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:09:52,386 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-11-28 03:09:52,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566480570] [2020-11-28 03:09:52,387 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 03:09:52,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:52,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 03:09:52,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:09:52,394 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 9 states. [2020-11-28 03:09:52,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:52,453 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-11-28 03:09:52,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:09:52,453 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 10 [2020-11-28 03:09:52,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:52,454 INFO L225 Difference]: With dead ends: 16 [2020-11-28 03:09:52,454 INFO L226 Difference]: Without dead ends: 12 [2020-11-28 03:09:52,455 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:09:52,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-28 03:09:52,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-11-28 03:09:52,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-11-28 03:09:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-11-28 03:09:52,458 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-11-28 03:09:52,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:52,458 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-11-28 03:09:52,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 03:09:52,459 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-11-28 03:09:52,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 03:09:52,459 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:52,459 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:52,668 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:09:52,669 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:52,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:52,669 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2020-11-28 03:09:52,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:52,669 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726497219] [2020-11-28 03:09:52,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:09:52,832 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:52,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726497219] [2020-11-28 03:09:52,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714117121] [2020-11-28 03:09:52,832 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:09:52,888 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-11-28 03:09:52,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:09:52,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2020-11-28 03:09:52,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:09:52,955 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:09:52,956 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:09:52,956 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-11-28 03:09:52,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043043572] [2020-11-28 03:09:52,957 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-28 03:09:52,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:09:52,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 03:09:52,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-11-28 03:09:52,958 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 10 states. [2020-11-28 03:09:53,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:09:53,061 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2020-11-28 03:09:53,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 03:09:53,062 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2020-11-28 03:09:53,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:09:53,062 INFO L225 Difference]: With dead ends: 17 [2020-11-28 03:09:53,062 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 03:09:53,063 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-11-28 03:09:53,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 03:09:53,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-28 03:09:53,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-28 03:09:53,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-11-28 03:09:53,066 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-11-28 03:09:53,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:09:53,066 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-11-28 03:09:53,066 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-28 03:09:53,066 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-11-28 03:09:53,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-28 03:09:53,067 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:09:53,067 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2020-11-28 03:09:53,284 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-28 03:09:53,285 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:09:53,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:09:53,285 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2020-11-28 03:09:53,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:09:53,285 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979866060] [2020-11-28 03:09:53,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:09:53,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:09:53,317 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:09:53,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:09:53,354 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:09:53,370 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:09:53,373 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 03:09:53,374 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-28 03:09:53,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 03:09:53 BoogieIcfgContainer [2020-11-28 03:09:53,398 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 03:09:53,398 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:09:53,399 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:09:53,399 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:09:53,399 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:09:49" (3/4) ... [2020-11-28 03:09:53,401 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 03:09:53,442 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_be0e11a4-c904-4fa5-ae46-74a96179547a/bin/uautomizer/witness.graphml [2020-11-28 03:09:53,443 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:09:53,444 INFO L168 Benchmark]: Toolchain (without parser) took 4283.12 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 61.1 MB in the beginning and 35.1 MB in the end (delta: 26.1 MB). Peak memory consumption was 44.3 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,445 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 90.2 MB. Free memory is still 48.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:09:53,445 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.16 ms. Allocated memory is still 90.2 MB. Free memory was 60.9 MB in the beginning and 67.1 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,446 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.66 ms. Allocated memory is still 90.2 MB. Free memory was 67.1 MB in the beginning and 65.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:09:53,446 INFO L168 Benchmark]: Boogie Preprocessor took 28.39 ms. Allocated memory is still 90.2 MB. Free memory was 65.9 MB in the beginning and 65.0 MB in the end (delta: 910.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,447 INFO L168 Benchmark]: RCFGBuilder took 380.14 ms. Allocated memory is still 90.2 MB. Free memory was 64.7 MB in the beginning and 54.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,448 INFO L168 Benchmark]: TraceAbstraction took 3508.97 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 54.2 MB in the beginning and 37.2 MB in the end (delta: 17.0 MB). Peak memory consumption was 37.0 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,448 INFO L168 Benchmark]: Witness Printer took 44.24 ms. Allocated memory is still 109.1 MB. Free memory was 37.2 MB in the beginning and 35.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:09:53,451 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 90.2 MB. Free memory is still 48.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 275.16 ms. Allocated memory is still 90.2 MB. Free memory was 60.9 MB in the beginning and 67.1 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.66 ms. Allocated memory is still 90.2 MB. Free memory was 67.1 MB in the beginning and 65.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.39 ms. Allocated memory is still 90.2 MB. Free memory was 65.9 MB in the beginning and 65.0 MB in the end (delta: 910.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 380.14 ms. Allocated memory is still 90.2 MB. Free memory was 64.7 MB in the beginning and 54.5 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3508.97 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 54.2 MB in the beginning and 37.2 MB in the end (delta: 17.0 MB). Peak memory consumption was 37.0 MB. Max. memory is 16.1 GB. * Witness Printer took 44.24 ms. Allocated memory is still 109.1 MB. Free memory was 37.2 MB in the beginning and 35.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L6] COND TRUE !(cond) [L3] __assert_fail("0", "underapprox_2-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.4s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 39 SDtfs, 2 SDslu, 102 SDs, 0 SdLazy, 199 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 43 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=13occurred in iteration=6, 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, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 2686 SizeOfPredicates, 5 NumberOfNonLiveVariables, 290 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 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...