./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d74df1b7449c0e223ad61b2c5cd0b2b79a63ca78 ............................................................................................................................................................................................................................................................................................................................................ Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d74df1b7449c0e223ad61b2c5cd0b2b79a63ca78 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: UnsupportedOperationException: translation of (bvneg (_ BitVec 64) (_ BitVec 64)) not yet implemented, please contact Matthias --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 11:17:42,889 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 11:17:42,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 11:17:42,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 11:17:42,918 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 11:17:42,919 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 11:17:42,921 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 11:17:42,935 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 11:17:42,936 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 11:17:42,937 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 11:17:42,938 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 11:17:42,939 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 11:17:42,939 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 11:17:42,940 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 11:17:42,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 11:17:42,943 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 11:17:42,944 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 11:17:42,945 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 11:17:42,947 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 11:17:42,949 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 11:17:42,951 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 11:17:42,953 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 11:17:42,954 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 11:17:42,955 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 11:17:42,958 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 11:17:42,959 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 11:17:42,959 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 11:17:42,960 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 11:17:42,961 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 11:17:42,962 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 11:17:42,962 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 11:17:42,963 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 11:17:42,964 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 11:17:42,965 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 11:17:42,966 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 11:17:42,966 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 11:17:42,967 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 11:17:42,967 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 11:17:42,968 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 11:17:42,968 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 11:17:42,969 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 11:17:42,970 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 11:17:42,995 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 11:17:42,995 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 11:17:42,996 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 11:17:42,996 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 11:17:42,996 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 11:17:42,996 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 11:17:42,997 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 11:17:42,998 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 11:17:42,998 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 11:17:42,998 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 11:17:42,999 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 11:17:42,999 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 11:17:42,999 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 11:17:42,999 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 11:17:43,000 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 11:17:43,000 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 11:17:43,000 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 11:17:43,000 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 11:17:43,000 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 11:17:43,001 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 11:17:43,001 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 11:17:43,001 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 11:17:43,001 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 11:17:43,001 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 11:17:43,002 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 11:17:43,002 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 11:17:43,002 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 11:17:43,002 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 11:17:43,002 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 11:17:43,003 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d74df1b7449c0e223ad61b2c5cd0b2b79a63ca78 [2020-12-09 11:17:43,188 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 11:17:43,209 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 11:17:43,211 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 11:17:43,212 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 11:17:43,213 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 11:17:43,214 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c [2020-12-09 11:17:43,260 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/88e534a1b/9a5cb5daaeaf4292a50c7d18d693ac8b/FLAG4ce76681a [2020-12-09 11:17:43,616 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 11:17:43,616 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c [2020-12-09 11:17:43,621 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/88e534a1b/9a5cb5daaeaf4292a50c7d18d693ac8b/FLAG4ce76681a [2020-12-09 11:17:43,631 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/88e534a1b/9a5cb5daaeaf4292a50c7d18d693ac8b [2020-12-09 11:17:43,632 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 11:17:43,633 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 11:17:43,635 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 11:17:43,635 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 11:17:43,638 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 11:17:43,639 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,640 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5de5655e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43, skipping insertion in model container [2020-12-09 11:17:43,641 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 11:17:43,660 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 11:17:43,763 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c[458,471] [2020-12-09 11:17:43,773 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 11:17:43,779 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 11:17:43,788 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c[458,471] [2020-12-09 11:17:43,792 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 11:17:43,802 INFO L208 MainTranslator]: Completed translation [2020-12-09 11:17:43,802 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43 WrapperNode [2020-12-09 11:17:43,802 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 11:17:43,803 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 11:17:43,803 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 11:17:43,803 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 11:17:43,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,813 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,826 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 11:17:43,826 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 11:17:43,826 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 11:17:43,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 11:17:43,832 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,832 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,833 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,833 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,836 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,838 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,839 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... [2020-12-09 11:17:43,841 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 11:17:43,841 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 11:17:43,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 11:17:43,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 11:17:43,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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 [2020-12-09 11:17:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 11:17:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 11:17:43,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 11:17:43,894 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 11:17:44,103 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 11:17:44,103 INFO L299 CfgBuilder]: Removed 13 assume(true) statements. [2020-12-09 11:17:44,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:17:44 BoogieIcfgContainer [2020-12-09 11:17:44,105 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 11:17:44,107 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 11:17:44,107 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 11:17:44,110 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 11:17:44,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 11:17:43" (1/3) ... [2020-12-09 11:17:44,111 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa78b8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 11:17:44, skipping insertion in model container [2020-12-09 11:17:44,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:17:43" (2/3) ... [2020-12-09 11:17:44,112 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa78b8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 11:17:44, skipping insertion in model container [2020-12-09 11:17:44,112 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:17:44" (3/3) ... [2020-12-09 11:17:44,113 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound2.c [2020-12-09 11:17:44,126 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 11:17:44,128 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2020-12-09 11:17:44,138 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2020-12-09 11:17:44,155 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 11:17:44,155 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 11:17:44,155 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 11:17:44,155 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 11:17:44,155 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 11:17:44,156 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 11:17:44,156 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 11:17:44,156 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 11:17:44,166 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-09 11:17:44,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 11:17:44,169 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:17:44,170 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 11:17:44,170 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:17:44,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:17:44,175 INFO L82 PathProgramCache]: Analyzing trace with hash 2967281, now seen corresponding path program 1 times [2020-12-09 11:17:44,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 11:17:44,185 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998197368] [2020-12-09 11:17:44,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 11:17:44,274 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-09 11:17:44,274 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [416047081] [2020-12-09 11:17:44,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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 [2020-12-09 11:17:44,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:17:44,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-09 11:17:44,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:17:44,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:17:44,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:17:46,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:17:46,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998197368] [2020-12-09 11:17:46,482 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 11:17:46,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416047081] [2020-12-09 11:17:46,483 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-12-09 11:17:46,483 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2020-12-09 11:17:46,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449732251] [2020-12-09 11:17:46,486 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 11:17:46,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 11:17:46,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 11:17:46,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=18, Unknown=1, NotChecked=0, Total=30 [2020-12-09 11:17:46,496 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 6 states. [2020-12-09 11:17:53,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:17:53,417 INFO L93 Difference]: Finished difference Result 45 states and 61 transitions. [2020-12-09 11:17:53,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 11:17:53,418 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 4 [2020-12-09 11:17:53,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:17:53,424 INFO L225 Difference]: With dead ends: 45 [2020-12-09 11:17:53,424 INFO L226 Difference]: Without dead ends: 22 [2020-12-09 11:17:53,425 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=23, Invalid=30, Unknown=3, NotChecked=0, Total=56 [2020-12-09 11:17:53,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-09 11:17:53,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2020-12-09 11:17:53,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 11:17:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-12-09 11:17:53,446 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 4 [2020-12-09 11:17:53,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:17:53,447 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-12-09 11:17:53,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 11:17:53,447 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-12-09 11:17:53,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 11:17:53,447 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:17:53,447 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1] [2020-12-09 11:17:53,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2020-12-09 11:17:53,650 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:17:53,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:17:53,651 INFO L82 PathProgramCache]: Analyzing trace with hash 1677173713, now seen corresponding path program 1 times [2020-12-09 11:17:53,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 11:17:53,653 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285735579] [2020-12-09 11:17:53,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 11:17:53,664 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-09 11:17:53,664 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [612983777] [2020-12-09 11:17:53,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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 [2020-12-09 11:17:53,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:17:53,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-09 11:17:53,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:17:53,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:17:53,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:17:57,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285735579] [2020-12-09 11:17:57,851 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 11:17:57,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612983777] [2020-12-09 11:17:57,851 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: null [2020-12-09 11:17:57,852 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553061567] [2020-12-09 11:17:57,867 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 11:17:57,867 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 11:17:57,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 11:17:57,874 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 11:17:57,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 11:17:57,941 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 11:17:57,981 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 11:17:58,334 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 11:17:58,729 WARN L197 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 56 [2020-12-09 11:19:24,429 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 11:19:24,430 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2020-12-09 11:19:24,430 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2020-12-09 11:19:24,430 ERROR L205 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2020-12-09 11:19:24,430 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 11:19:24,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 11:19:24,641 WARN L219 RCFGBacktranslator]: You are using large block encoding together with an algorithm for which the backtranslation into program statements is not yet implemented. [2020-12-09 11:19:24,641 ERROR L222 RCFGBacktranslator]: unable to determine which branch was taken, unable to determine the location [2020-12-09 11:19:24,648 WARN L254 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-12-09 11:19:24,648 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 11:19:24 BoogieIcfgContainer [2020-12-09 11:19:24,648 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 11:19:24,649 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 11:19:24,649 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 11:19:24,649 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 11:19:24,649 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:17:44" (3/4) ... [2020-12-09 11:19:24,651 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-09 11:19:24,651 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 11:19:24,653 INFO L168 Benchmark]: Toolchain (without parser) took 101018.43 ms. Allocated memory was 98.6 MB in the beginning and 123.7 MB in the end (delta: 25.2 MB). Free memory was 69.5 MB in the beginning and 71.5 MB in the end (delta: -2.0 MB). Peak memory consumption was 22.9 MB. Max. memory is 16.1 GB. [2020-12-09 11:19:24,653 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 98.6 MB. Free memory is still 63.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 11:19:24,654 INFO L168 Benchmark]: CACSL2BoogieTranslator took 167.68 ms. Allocated memory is still 98.6 MB. Free memory was 69.2 MB in the beginning and 75.7 MB in the end (delta: -6.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 11:19:24,654 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.90 ms. Allocated memory is still 98.6 MB. Free memory was 75.7 MB in the beginning and 74.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 11:19:24,655 INFO L168 Benchmark]: Boogie Preprocessor took 14.38 ms. Allocated memory is still 98.6 MB. Free memory was 74.0 MB in the beginning and 73.2 MB in the end (delta: 756.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 11:19:24,655 INFO L168 Benchmark]: RCFGBuilder took 264.00 ms. Allocated memory is still 98.6 MB. Free memory was 72.9 MB in the beginning and 56.1 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-12-09 11:19:24,656 INFO L168 Benchmark]: TraceAbstraction took 100541.58 ms. Allocated memory was 98.6 MB in the beginning and 123.7 MB in the end (delta: 25.2 MB). Free memory was 55.8 MB in the beginning and 71.5 MB in the end (delta: -15.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 16.1 GB. [2020-12-09 11:19:24,657 INFO L168 Benchmark]: Witness Printer took 2.62 ms. Allocated memory is still 123.7 MB. Free memory is still 71.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 11:19:24,660 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 98.6 MB. Free memory is still 63.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 167.68 ms. Allocated memory is still 98.6 MB. Free memory was 69.2 MB in the beginning and 75.7 MB in the end (delta: -6.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 22.90 ms. Allocated memory is still 98.6 MB. Free memory was 75.7 MB in the beginning and 74.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 14.38 ms. Allocated memory is still 98.6 MB. Free memory was 74.0 MB in the beginning and 73.2 MB in the end (delta: 756.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 264.00 ms. Allocated memory is still 98.6 MB. Free memory was 72.9 MB in the beginning and 56.1 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 100541.58 ms. Allocated memory was 98.6 MB in the beginning and 123.7 MB in the end (delta: 25.2 MB). Free memory was 55.8 MB in the beginning and 71.5 MB in the end (delta: -15.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 16.1 GB. * Witness Printer took 2.62 ms. Allocated memory is still 123.7 MB. Free memory is still 71.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L18] short k; [L19] long long y, x, c; [L20] k = __VERIFIER_nondet_short() [L7] COND TRUE !cond [L23] y = 0 [L24] x = 0 [L25] c = 0 [L27] COND TRUE 1 [L10] COND FALSE !(!(cond)) [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x [L27] COND TRUE 1 [L10] COND FALSE !(!(cond)) [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x [L27] COND TRUE 1 [L10] COND TRUE !(cond) [L12] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 3 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 100.4s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 6.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 9 SDtfs, 25 SDslu, 27 SDs, 0 SdLazy, 27 SolverSat, 15 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=1, 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, 1 MinimizatonAttempts, 3 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 4 NumberOfCodeBlocks, 4 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 6 ConstructedInterpolants, 0 QuantifiedInterpolants, 105 SizeOfPredicates, 6 NumberOfNonLiveVariables, 51 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.0-7b2dab5 [2020-12-09 11:19:26,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 11:19:26,179 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 11:19:26,201 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 11:19:26,202 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 11:19:26,203 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 11:19:26,204 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 11:19:26,206 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 11:19:26,208 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 11:19:26,208 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 11:19:26,209 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 11:19:26,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 11:19:26,211 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 11:19:26,212 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 11:19:26,213 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 11:19:26,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 11:19:26,214 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 11:19:26,215 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 11:19:26,217 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 11:19:26,219 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 11:19:26,220 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 11:19:26,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 11:19:26,222 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 11:19:26,223 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 11:19:26,226 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 11:19:26,226 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 11:19:26,226 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 11:19:26,227 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 11:19:26,227 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 11:19:26,228 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 11:19:26,229 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 11:19:26,229 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 11:19:26,230 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 11:19:26,230 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 11:19:26,231 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 11:19:26,231 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 11:19:26,232 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 11:19:26,232 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 11:19:26,232 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 11:19:26,233 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 11:19:26,233 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 11:19:26,234 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2020-12-09 11:19:26,259 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 11:19:26,259 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 11:19:26,260 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 11:19:26,260 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 11:19:26,260 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 11:19:26,260 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 11:19:26,260 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 11:19:26,260 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 11:19:26,260 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 11:19:26,261 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 11:19:26,261 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 11:19:26,261 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 11:19:26,261 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 11:19:26,261 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 11:19:26,261 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 11:19:26,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 11:19:26,263 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 11:19:26,263 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-09 11:19:26,263 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 11:19:26,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 11:19:26,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 11:19:26,263 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 11:19:26,263 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 11:19:26,264 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d74df1b7449c0e223ad61b2c5cd0b2b79a63ca78 [2020-12-09 11:19:26,507 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 11:19:26,526 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 11:19:26,529 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 11:19:26,530 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 11:19:26,530 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 11:19:26,531 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c [2020-12-09 11:19:26,577 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/dede5d846/99988547c80c432cb62f54340ec837b1/FLAGc40db73e8 [2020-12-09 11:19:27,026 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 11:19:27,027 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c [2020-12-09 11:19:27,032 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/dede5d846/99988547c80c432cb62f54340ec837b1/FLAGc40db73e8 [2020-12-09 11:19:27,042 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/data/dede5d846/99988547c80c432cb62f54340ec837b1 [2020-12-09 11:19:27,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 11:19:27,045 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 11:19:27,045 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 11:19:27,046 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 11:19:27,048 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 11:19:27,049 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,050 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d4fe391 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27, skipping insertion in model container [2020-12-09 11:19:27,050 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,055 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 11:19:27,064 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 11:19:27,156 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c[458,471] [2020-12-09 11:19:27,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 11:19:27,175 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 11:19:27,192 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound2.c[458,471] [2020-12-09 11:19:27,203 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 11:19:27,217 INFO L208 MainTranslator]: Completed translation [2020-12-09 11:19:27,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27 WrapperNode [2020-12-09 11:19:27,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 11:19:27,219 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 11:19:27,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 11:19:27,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 11:19:27,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,234 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,248 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 11:19:27,248 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 11:19:27,249 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 11:19:27,249 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 11:19:27,255 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,255 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,257 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,261 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... [2020-12-09 11:19:27,268 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 11:19:27,268 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 11:19:27,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 11:19:27,269 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 11:19:27,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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 [2020-12-09 11:19:27,331 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-12-09 11:19:27,332 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 11:19:27,332 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 11:19:27,332 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 11:19:28,229 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 11:19:28,229 INFO L299 CfgBuilder]: Removed 13 assume(true) statements. [2020-12-09 11:19:28,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:19:28 BoogieIcfgContainer [2020-12-09 11:19:28,231 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 11:19:28,232 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 11:19:28,232 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 11:19:28,234 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 11:19:28,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 11:19:27" (1/3) ... [2020-12-09 11:19:28,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48f2065a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 11:19:28, skipping insertion in model container [2020-12-09 11:19:28,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 11:19:27" (2/3) ... [2020-12-09 11:19:28,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48f2065a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 11:19:28, skipping insertion in model container [2020-12-09 11:19:28,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 11:19:28" (3/3) ... [2020-12-09 11:19:28,236 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound2.c [2020-12-09 11:19:28,249 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 11:19:28,251 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2020-12-09 11:19:28,260 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2020-12-09 11:19:28,279 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 11:19:28,279 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 11:19:28,279 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 11:19:28,279 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 11:19:28,279 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 11:19:28,279 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 11:19:28,279 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 11:19:28,280 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 11:19:28,289 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-12-09 11:19:28,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 11:19:28,292 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:19:28,292 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 11:19:28,293 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:19:28,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:19:28,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1804972333, now seen corresponding path program 1 times [2020-12-09 11:19:28,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 11:19:28,305 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [323146856] [2020-12-09 11:19:28,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-12-09 11:19:28,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:28,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 1 conjunts are in the unsatisfiable core [2020-12-09 11:19:28,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:28,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:28,462 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 11:19:28,462 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [323146856] [2020-12-09 11:19:28,463 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 11:19:28,463 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 11:19:28,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791491080] [2020-12-09 11:19:28,466 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-09 11:19:28,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 11:19:28,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-09 11:19:28,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 11:19:28,477 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-12-09 11:19:28,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:19:28,487 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-12-09 11:19:28,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-09 11:19:28,488 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 7 [2020-12-09 11:19:28,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:19:28,493 INFO L225 Difference]: With dead ends: 39 [2020-12-09 11:19:28,494 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 11:19:28,495 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-09 11:19:28,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 11:19:28,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 11:19:28,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 11:19:28,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-12-09 11:19:28,517 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 7 [2020-12-09 11:19:28,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:19:28,517 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-12-09 11:19:28,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-09 11:19:28,518 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-12-09 11:19:28,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 11:19:28,518 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:19:28,518 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 11:19:28,719 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-12-09 11:19:28,720 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:19:28,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:19:28,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1806819375, now seen corresponding path program 1 times [2020-12-09 11:19:28,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 11:19:28,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708521812] [2020-12-09 11:19:28,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-12-09 11:19:28,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:28,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 11:19:28,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:28,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:28,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-12-09 11:19:28,956 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708521812] [2020-12-09 11:19:28,956 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 11:19:28,956 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-09 11:19:28,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777991760] [2020-12-09 11:19:28,957 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 11:19:28,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 11:19:28,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 11:19:28,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 11:19:28,958 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 4 states. [2020-12-09 11:19:30,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:19:30,120 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-12-09 11:19:30,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 11:19:30,121 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2020-12-09 11:19:30,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:19:30,121 INFO L225 Difference]: With dead ends: 31 [2020-12-09 11:19:30,121 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 11:19:30,122 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-09 11:19:30,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 11:19:30,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-12-09 11:19:30,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 11:19:30,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-12-09 11:19:30,128 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 7 [2020-12-09 11:19:30,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:19:30,128 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-12-09 11:19:30,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 11:19:30,128 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-12-09 11:19:30,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 11:19:30,129 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:19:30,129 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 11:19:30,329 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-12-09 11:19:30,331 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:19:30,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:19:30,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1864186656, now seen corresponding path program 1 times [2020-12-09 11:19:30,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 11:19:30,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [200051621] [2020-12-09 11:19:30,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-12-09 11:19:30,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:30,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-09 11:19:30,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:31,119 WARN L197 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-12-09 11:19:31,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:31,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:19:33,449 WARN L197 SmtUtils]: Spent 411.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-12-09 11:19:35,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 11:19:35,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [200051621] [2020-12-09 11:19:35,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [825085755] [2020-12-09 11:19:35,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt [2020-12-09 11:19:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:36,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-09 11:19:36,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:36,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:36,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:19:37,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 11:19:37,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892344355] [2020-12-09 11:19:37,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/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 [2020-12-09 11:19:38,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:38,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-09 11:19:38,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:39,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:39,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:19:41,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 11:19:41,233 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-09 11:19:41,233 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5, 4, 6, 4] total 8 [2020-12-09 11:19:41,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165209699] [2020-12-09 11:19:41,234 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 11:19:41,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 11:19:41,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 11:19:41,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-12-09 11:19:41,235 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2020-12-09 11:19:42,819 WARN L197 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-12-09 11:19:45,861 WARN L197 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 30 [2020-12-09 11:19:46,657 WARN L197 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-12-09 11:19:47,057 WARN L197 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-12-09 11:19:50,990 WARN L197 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 26 [2020-12-09 11:19:54,235 WARN L197 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 29 [2020-12-09 11:19:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:19:54,717 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-12-09 11:19:54,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 11:19:54,717 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2020-12-09 11:19:54,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:19:54,718 INFO L225 Difference]: With dead ends: 29 [2020-12-09 11:19:54,718 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 11:19:54,719 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-12-09 11:19:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 11:19:54,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2020-12-09 11:19:54,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 11:19:54,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-12-09 11:19:54,722 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 10 [2020-12-09 11:19:54,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:19:54,722 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-12-09 11:19:54,722 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 11:19:54,722 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-12-09 11:19:54,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-09 11:19:54,723 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:19:54,723 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 11:19:55,324 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 cvc4 --incremental --print-success --lang smt [2020-12-09 11:19:55,326 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:19:55,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:19:55,327 INFO L82 PathProgramCache]: Analyzing trace with hash -2052638844, now seen corresponding path program 1 times [2020-12-09 11:19:55,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 11:19:55,329 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [661785036] [2020-12-09 11:19:55,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2020-12-09 11:19:55,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:19:55,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 11:19:55,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:19:55,945 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-09 11:19:55,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:19:55,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:19:58,301 WARN L197 SmtUtils]: Spent 597.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-12-09 11:19:59,785 WARN L197 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-12-09 11:20:01,941 WARN L197 SmtUtils]: Spent 695.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-12-09 11:20:01,957 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:20:01,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [661785036] [2020-12-09 11:20:01,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1830931382] [2020-12-09 11:20:01,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt [2020-12-09 11:20:02,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:20:02,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-09 11:20:02,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:20:02,523 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-09 11:20:02,532 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:20:02,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:20:06,018 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-12-09 11:20:06,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:20:06,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84077401] [2020-12-09 11:20:06,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 11:20:08,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:20:08,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-09 11:20:08,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:20:09,788 WARN L197 SmtUtils]: Spent 840.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-12-09 11:20:12,335 WARN L197 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 41 DAG size of output: 20 [2020-12-09 11:20:12,345 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-09 11:20:12,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:20:12,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:20:14,554 WARN L197 SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-12-09 11:20:14,564 INFO L398 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-12-09 11:20:14,565 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-12-09 11:20:23,826 WARN L197 SmtUtils]: Spent 1.84 s on a formula simplification that was a NOOP. DAG size: 30 [2020-12-09 11:20:32,955 WARN L197 SmtUtils]: Spent 1.62 s on a formula simplification that was a NOOP. DAG size: 44 [2020-12-09 11:20:32,982 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:20:32,983 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-09 11:20:32,983 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6, 6, 10, 8] total 21 [2020-12-09 11:20:32,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109286725] [2020-12-09 11:20:32,983 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-09 11:20:32,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 11:20:32,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-09 11:20:32,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=307, Unknown=2, NotChecked=0, Total=420 [2020-12-09 11:20:32,984 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 21 states. [2020-12-09 11:20:40,280 WARN L197 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 36 DAG size of output: 28 [2020-12-09 11:20:45,565 WARN L197 SmtUtils]: Spent 2.93 s on a formula simplification. DAG size of input: 43 DAG size of output: 36 [2020-12-09 11:20:46,698 WARN L197 SmtUtils]: Spent 999.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 28 [2020-12-09 11:20:51,549 WARN L197 SmtUtils]: Spent 2.35 s on a formula simplification. DAG size of input: 39 DAG size of output: 32 [2020-12-09 11:20:55,605 WARN L197 SmtUtils]: Spent 2.46 s on a formula simplification. DAG size of input: 42 DAG size of output: 35 [2020-12-09 11:21:06,949 WARN L197 SmtUtils]: Spent 1.98 s on a formula simplification. DAG size of input: 42 DAG size of output: 35 [2020-12-09 11:21:11,439 WARN L197 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 39 DAG size of output: 32 [2020-12-09 11:21:17,788 WARN L197 SmtUtils]: Spent 1.78 s on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-12-09 11:21:21,000 WARN L197 SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 41 DAG size of output: 34 [2020-12-09 11:21:25,023 WARN L197 SmtUtils]: Spent 1.97 s on a formula simplification. DAG size of input: 28 DAG size of output: 21 [2020-12-09 11:21:28,642 WARN L197 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 42 DAG size of output: 35 [2020-12-09 11:21:36,893 WARN L197 SmtUtils]: Spent 2.82 s on a formula simplification. DAG size of input: 37 DAG size of output: 30 [2020-12-09 11:21:42,910 WARN L197 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 41 DAG size of output: 34 [2020-12-09 11:21:43,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:21:43,422 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-12-09 11:21:43,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-09 11:21:43,466 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 13 [2020-12-09 11:21:43,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:21:43,466 INFO L225 Difference]: With dead ends: 34 [2020-12-09 11:21:43,466 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 11:21:43,467 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 83.3s TimeCoverageRelationStatistics Valid=393, Invalid=1011, Unknown=2, NotChecked=0, Total=1406 [2020-12-09 11:21:43,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 11:21:43,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-09 11:21:43,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-09 11:21:43,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-12-09 11:21:43,474 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 13 [2020-12-09 11:21:43,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:21:43,474 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-12-09 11:21:43,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-09 11:21:43,474 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-12-09 11:21:43,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-09 11:21:43,475 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 11:21:43,475 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 11:21:44,076 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 mathsat -unsat_core_generation=3,8 cvc4 --incremental --print-success --lang smt [2020-12-09 11:21:44,078 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 11:21:44,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 11:21:44,080 INFO L82 PathProgramCache]: Analyzing trace with hash -755348412, now seen corresponding path program 2 times [2020-12-09 11:21:44,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy WALRUS [2020-12-09 11:21:44,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250844096] [2020-12-09 11:21:44,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/mathsat Starting monitored process 10 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with mathsat -unsat_core_generation=3 [2020-12-09 11:21:44,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 11:21:45,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-09 11:21:45,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:21:45,377 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:21:45,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:21:45,847 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:21:45,847 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250844096] [2020-12-09 11:21:45,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [893748613] [2020-12-09 11:21:45,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt [2020-12-09 11:21:47,308 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-09 11:21:47,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 11:21:47,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-09 11:21:47,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:21:48,098 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-09 11:21:48,232 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:21:48,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:21:56,247 WARN L197 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-12-09 11:22:00,627 WARN L197 SmtUtils]: Spent 940.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-12-09 11:22:05,954 WARN L197 SmtUtils]: Spent 800.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-12-09 11:22:12,869 WARN L197 SmtUtils]: Spent 1.90 s on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-12-09 11:22:20,309 WARN L197 SmtUtils]: Spent 1.30 s on a formula simplification that was a NOOP. DAG size: 27 [2020-12-09 11:22:27,807 WARN L197 SmtUtils]: Spent 1.15 s on a formula simplification that was a NOOP. DAG size: 27 [2020-12-09 11:22:39,084 WARN L197 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-12-09 11:22:39,110 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:22:39,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711704270] [2020-12-09 11:22:39,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f1a06bc2-70af-4118-b135-8c823f076904/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 11:22:43,653 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-09 11:22:43,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 11:22:43,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-09 11:22:43,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 11:22:45,426 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-09 11:22:45,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 11:22:57,342 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 11:22:57,343 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2020-12-09 11:22:57,343 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10, 10, 8, 10] total 43 [2020-12-09 11:22:57,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216040438] [2020-12-09 11:22:57,344 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-12-09 11:22:57,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2020-12-09 11:22:57,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-12-09 11:22:57,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=1497, Unknown=3, NotChecked=0, Total=1806 [2020-12-09 11:22:57,346 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 43 states. [2020-12-09 11:23:01,080 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-12-09 11:23:05,910 WARN L197 SmtUtils]: Spent 843.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 25 [2020-12-09 11:23:06,957 WARN L197 SmtUtils]: Spent 727.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 22 [2020-12-09 11:23:06,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 11:23:06,966 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-12-09 11:23:06,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 11:23:06,967 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 25 [2020-12-09 11:23:06,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 11:23:06,967 INFO L225 Difference]: With dead ends: 26 [2020-12-09 11:23:06,967 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 11:23:06,969 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 578 ImplicationChecksByTransitivity, 69.7s TimeCoverageRelationStatistics Valid=478, Invalid=1969, Unknown=3, NotChecked=0, Total=2450 [2020-12-09 11:23:06,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 11:23:06,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 11:23:06,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 11:23:06,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 11:23:06,969 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-12-09 11:23:06,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 11:23:06,970 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 11:23:06,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-12-09 11:23:06,970 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 11:23:06,970 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 11:23:07,571 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 mathsat -unsat_core_generation=3,11 cvc4 --incremental --print-success --lang smt [2020-12-09 11:23:07,576 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-09 11:23:11,879 WARN L197 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 43 DAG size of output: 36 [2020-12-09 11:23:20,110 WARN L197 SmtUtils]: Spent 8.23 s on a formula simplification. DAG size of input: 77 DAG size of output: 59 [2020-12-09 11:23:29,460 WARN L197 SmtUtils]: Spent 9.35 s on a formula simplification. DAG size of input: 77 DAG size of output: 59 [2020-12-09 11:23:29,463 INFO L258 CegarLoopResult]: At program point L27-2(lines 27 36) the Hoare annotation is: (let ((.cse11 (bvmul ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0))) (let ((.cse2 ((_ sign_extend 32) (_ bv0 32))) (.cse10 (bvneg .cse11)) (.cse0 ((_ sign_extend 16) ULTIMATE.start_main_~k~0))) (let ((.cse3 (bvsle .cse0 (_ bv2 32))) (.cse5 (= (bvadd ULTIMATE.start___VERIFIER_assert_~cond (_ bv4294967295 32)) (_ bv0 32))) (.cse1 (= (_ bv1 32) ULTIMATE.start_assume_abort_if_not_~cond)) (.cse6 ((_ sign_extend 32) .cse0)) (.cse7 (= .cse2 (bvadd (bvneg (bvmul (bvmul .cse11 ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0)) (bvmul ((_ sign_extend 32) (_ bv4 32)) ULTIMATE.start_main_~x~0) .cse10 (bvneg (bvmul (bvmul (bvmul ((_ sign_extend 32) (_ bv2 32)) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0))))) (.cse8 ((_ sign_extend 32) (_ bv1 32)))) (or (and (bvsge .cse0 (_ bv0 32)) .cse1 (= .cse2 ULTIMATE.start_main_~x~0) .cse3 (= .cse2 ULTIMATE.start_main_~y~0) (= .cse2 ULTIMATE.start_main_~c~0)) (let ((.cse4 (bvadd .cse8 .cse2))) (and (= .cse4 ULTIMATE.start_main_~y~0) .cse5 .cse1 (= .cse4 ULTIMATE.start_main_~c~0) .cse3 (bvslt .cse2 .cse6) (= (bvadd (bvmul (bvmul ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0) (_ bv18446744073709551615 64)) ULTIMATE.start_main_~x~0) .cse2) .cse7)) (let ((.cse9 (bvadd (bvmul .cse8 (_ bv2 64)) .cse2))) (and .cse5 .cse1 (= ULTIMATE.start_main_~y~0 .cse9) (= .cse2 (bvadd .cse10 (bvmul ULTIMATE.start_main_~y~0 .cse6))) (= ULTIMATE.start_main_~c~0 .cse9) .cse7)))))) [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L27-3(lines 27 36) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L11(lines 11 12) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L11-1(lines 11 12) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L11-2(lines 11 12) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-09 11:23:29,463 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-12-09 11:23:29,464 INFO L262 CegarLoopResult]: For program point L10(lines 10 13) no Hoare annotation was computed. [2020-12-09 11:23:29,464 INFO L258 CegarLoopResult]: At program point L10-2(lines 30 31) the Hoare annotation is: (let ((.cse11 (bvmul ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0))) (let ((.cse3 ((_ sign_extend 32) (_ bv0 32))) (.cse10 (bvneg .cse11)) (.cse0 ((_ sign_extend 16) ULTIMATE.start_main_~k~0))) (let ((.cse4 (bvsle .cse0 (_ bv2 32))) (.cse1 (= (bvadd ULTIMATE.start___VERIFIER_assert_~cond (_ bv4294967295 32)) (_ bv0 32))) (.cse2 (= (_ bv1 32) ULTIMATE.start_assume_abort_if_not_~cond)) (.cse6 ((_ sign_extend 32) .cse0)) (.cse7 (= .cse3 (bvadd (bvneg (bvmul (bvmul .cse11 ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0)) (bvmul ((_ sign_extend 32) (_ bv4 32)) ULTIMATE.start_main_~x~0) .cse10 (bvneg (bvmul (bvmul (bvmul ((_ sign_extend 32) (_ bv2 32)) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0))))) (.cse8 ((_ sign_extend 32) (_ bv1 32)))) (or (and (bvsge .cse0 (_ bv0 32)) .cse1 .cse2 (= .cse3 ULTIMATE.start_main_~x~0) .cse4 (= .cse3 ULTIMATE.start_main_~y~0) (= .cse3 ULTIMATE.start_main_~c~0)) (let ((.cse5 (bvadd .cse8 .cse3))) (and (= .cse5 ULTIMATE.start_main_~y~0) .cse1 .cse2 (= .cse5 ULTIMATE.start_main_~c~0) .cse4 (bvslt .cse3 .cse6) (= (bvadd (bvmul (bvmul ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0) (_ bv18446744073709551615 64)) ULTIMATE.start_main_~x~0) .cse3) .cse7)) (let ((.cse9 (bvadd (bvmul .cse8 (_ bv2 64)) .cse3))) (and .cse1 .cse2 (= ULTIMATE.start_main_~y~0 .cse9) (= .cse3 (bvadd .cse10 (bvmul ULTIMATE.start_main_~y~0 .cse6))) (= ULTIMATE.start_main_~c~0 .cse9) .cse7)))))) [2020-12-09 11:23:29,464 INFO L262 CegarLoopResult]: For program point L10-3(lines 10 13) no Hoare annotation was computed. [2020-12-09 11:23:29,464 INFO L265 CegarLoopResult]: At program point L39(lines 17 40) the Hoare annotation is: true [2020-12-09 11:23:29,464 INFO L262 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2020-12-09 11:23:29,464 INFO L258 CegarLoopResult]: At program point L10-5(lines 9 15) the Hoare annotation is: (let ((.cse0 ((_ sign_extend 32) (_ bv0 32)))) (or (and (= (bvadd ULTIMATE.start___VERIFIER_assert_~cond (_ bv4294967295 32)) (_ bv0 32)) (= .cse0 ULTIMATE.start_main_~x~0) (= .cse0 ULTIMATE.start_main_~y~0)) (and (not (= ULTIMATE.start___VERIFIER_assert_~cond (_ bv0 32))) (or (= (_ bv1 32) ULTIMATE.start_assume_abort_if_not_~cond) (= (_ bv0 32) ULTIMATE.start_assume_abort_if_not_~cond)) (= .cse0 (let ((.cse1 (bvmul ULTIMATE.start_main_~y~0 ULTIMATE.start_main_~y~0))) (bvadd (bvneg (bvmul (bvmul .cse1 ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0)) (bvmul ((_ sign_extend 32) (_ bv4 32)) ULTIMATE.start_main_~x~0) (bvneg .cse1) (bvneg (bvmul (bvmul (bvmul ((_ sign_extend 32) (_ bv2 32)) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0) ULTIMATE.start_main_~y~0)))))))) [2020-12-09 11:23:29,464 INFO L262 CegarLoopResult]: For program point L10-6(lines 10 13) no Hoare annotation was computed. [2020-12-09 11:23:29,464 INFO L265 CegarLoopResult]: At program point L10-8(lines 9 15) the Hoare annotation is: true [2020-12-09 11:23:29,469 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.UnsupportedOperationException: translation of (bvneg (_ BitVec 64) (_ BitVec 64)) not yet implemented, please contact Matthias at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:211) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:165) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:165) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:165) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:165) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:129) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBacktranslator.translateExpression(RCFGBacktranslator.java:394) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBacktranslator.translateExpression(RCFGBacktranslator.java:1) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateExpression(ModelTranslationContainer.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateExpressionToString(ModelTranslationContainer.java:89) at de.uni_freiburg.informatik.ultimate.core.lib.results.InvariantResult.getLongDescription(InvariantResult.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ResultService.reportResult(ResultService.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.reportResult(TraceAbstractionStarter.java:796) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.createInvariantResults(TraceAbstractionStarter.java:283) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:240) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 11:23:29,471 INFO L168 Benchmark]: Toolchain (without parser) took 242426.13 ms. Allocated memory was 62.9 MB in the beginning and 86.0 MB in the end (delta: 23.1 MB). Free memory was 46.1 MB in the beginning and 54.5 MB in the end (delta: -8.4 MB). Peak memory consumption was 48.3 MB. Max. memory is 16.1 GB. [2020-12-09 11:23:29,472 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 62.9 MB. Free memory is still 45.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 11:23:29,472 INFO L168 Benchmark]: CACSL2BoogieTranslator took 172.64 ms. Allocated memory is still 62.9 MB. Free memory was 46.0 MB in the beginning and 46.5 MB in the end (delta: -575.9 kB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-09 11:23:29,472 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.05 ms. Allocated memory is still 62.9 MB. Free memory was 46.3 MB in the beginning and 45.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 11:23:29,473 INFO L168 Benchmark]: Boogie Preprocessor took 19.40 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 43.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 11:23:29,473 INFO L168 Benchmark]: RCFGBuilder took 962.31 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 30.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-09 11:23:29,474 INFO L168 Benchmark]: TraceAbstraction took 241238.62 ms. Allocated memory was 62.9 MB in the beginning and 86.0 MB in the end (delta: 23.1 MB). Free memory was 29.9 MB in the beginning and 54.5 MB in the end (delta: -24.6 MB). Peak memory consumption was 32.8 MB. Max. memory is 16.1 GB. [2020-12-09 11:23:29,476 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 62.9 MB. Free memory is still 45.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 172.64 ms. Allocated memory is still 62.9 MB. Free memory was 46.0 MB in the beginning and 46.5 MB in the end (delta: -575.9 kB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.05 ms. Allocated memory is still 62.9 MB. Free memory was 46.3 MB in the beginning and 45.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.40 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 43.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 962.31 ms. Allocated memory is still 62.9 MB. Free memory was 43.7 MB in the beginning and 30.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 241238.62 ms. Allocated memory was 62.9 MB in the beginning and 86.0 MB in the end (delta: 23.1 MB). Free memory was 29.9 MB in the beginning and 54.5 MB in the end (delta: -24.6 MB). Peak memory consumption was 32.8 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 3 specifications checked. All of them hold - ExceptionOrErrorResult: UnsupportedOperationException: translation of (bvneg (_ BitVec 64) (_ BitVec 64)) not yet implemented, please contact Matthias de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: UnsupportedOperationException: translation of (bvneg (_ BitVec 64) (_ BitVec 64)) not yet implemented, please contact Matthias: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Term2Expression.translate(Term2Expression.java:211) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...