./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V --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 64bit --witnessprinter.graph.data.programhash 4de76b02991c4f8780142b48e1370b1ba073d7148b74e77b2c83d6f21359d59e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:03:43,764 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:03:43,767 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:03:43,839 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:03:43,840 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:03:43,847 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:03:43,849 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:03:43,853 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:03:43,856 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:03:43,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:03:43,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:03:43,866 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:03:43,866 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:03:43,869 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:03:43,872 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:03:43,878 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:03:43,881 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:03:43,882 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:03:43,886 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:03:43,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:03:43,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:03:43,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:03:43,905 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:03:43,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:03:43,910 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:03:43,911 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:03:43,911 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:03:43,913 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:03:43,914 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:03:43,916 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:03:43,916 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:03:43,917 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:03:43,919 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:03:43,921 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:03:43,922 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:03:43,923 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:03:43,923 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:03:43,924 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:03:43,924 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:03:43,925 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:03:43,926 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:03:43,927 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-23 02:03:43,980 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:03:43,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:03:43,981 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:03:43,981 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:03:43,989 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:03:43,990 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:03:43,990 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:03:43,990 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:03:43,990 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:03:43,990 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:03:43,992 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:03:43,992 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:03:43,992 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:03:43,992 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:03:43,992 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:03:43,993 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:03:43,993 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:03:43,993 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:03:43,994 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:03:43,994 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:03:43,994 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:03:43,995 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:03:43,995 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:03:43,995 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:03:43,995 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:03:43,995 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:03:43,997 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:03:43,997 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:03:43,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:03:43,998 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:43,998 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:03:43,998 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:03:43,999 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:03:43,999 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:03:43,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:03:43,999 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:03:43,999 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:03:44,000 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:03:44,000 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_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4de76b02991c4f8780142b48e1370b1ba073d7148b74e77b2c83d6f21359d59e [2021-11-23 02:03:44,311 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:03:44,340 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:03:44,343 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:03:44,344 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:03:44,364 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:03:44,366 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:03:44,458 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/913fb8a3c/c287bb366d9f4a4fb22d83b524cdceea/FLAGa60068d6b [2021-11-23 02:03:45,374 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:03:45,374 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:03:45,415 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/913fb8a3c/c287bb366d9f4a4fb22d83b524cdceea/FLAGa60068d6b [2021-11-23 02:03:45,893 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/913fb8a3c/c287bb366d9f4a4fb22d83b524cdceea [2021-11-23 02:03:45,895 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:03:45,896 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:03:45,900 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:45,900 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:03:45,917 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:03:45,918 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:45" (1/1) ... [2021-11-23 02:03:45,919 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e978296 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:45, skipping insertion in model container [2021-11-23 02:03:45,919 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:45" (1/1) ... [2021-11-23 02:03:45,927 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:03:46,054 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:03:47,708 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i[185536,185549] [2021-11-23 02:03:47,881 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:47,906 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:03:48,290 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i[185536,185549] [2021-11-23 02:03:48,314 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:48,484 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:03:48,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48 WrapperNode [2021-11-23 02:03:48,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:48,485 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:48,486 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:03:48,486 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:03:48,494 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,576 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,712 INFO L137 Inliner]: procedures = 282, calls = 1375, calls flagged for inlining = 101, calls inlined = 84, statements flattened = 2567 [2021-11-23 02:03:48,713 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:48,714 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:03:48,714 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:03:48,715 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:03:48,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,750 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,875 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,901 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,917 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,946 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:03:48,947 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:03:48,948 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:03:48,948 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:03:48,949 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (1/1) ... [2021-11-23 02:03:48,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:48,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:49,015 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:03:49,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:03:49,070 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2021-11-23 02:03:49,070 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2021-11-23 02:03:49,071 INFO L130 BoogieDeclarations]: Found specification of procedure usb_translate_errors [2021-11-23 02:03:49,072 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_translate_errors [2021-11-23 02:03:49,072 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-23 02:03:49,072 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-23 02:03:49,072 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-23 02:03:49,072 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-23 02:03:49,072 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_wdm_mutex [2021-11-23 02:03:49,072 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_wdm_mutex [2021-11-23 02:03:49,072 INFO L130 BoogieDeclarations]: Found specification of procedure recover_from_urb_loss [2021-11-23 02:03:49,073 INFO L138 BoogieDeclarations]: Found implementation of procedure recover_from_urb_loss [2021-11-23 02:03:49,073 INFO L130 BoogieDeclarations]: Found specification of procedure usb_fill_control_urb [2021-11-23 02:03:49,073 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_fill_control_urb [2021-11-23 02:03:49,073 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-23 02:03:49,073 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-23 02:03:49,073 INFO L130 BoogieDeclarations]: Found specification of procedure activate_work_1 [2021-11-23 02:03:49,073 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_work_1 [2021-11-23 02:03:49,074 INFO L130 BoogieDeclarations]: Found specification of procedure __might_sleep [2021-11-23 02:03:49,074 INFO L138 BoogieDeclarations]: Found implementation of procedure __might_sleep [2021-11-23 02:03:49,074 INFO L130 BoogieDeclarations]: Found specification of procedure usb_autopm_get_interface [2021-11-23 02:03:49,074 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_autopm_get_interface [2021-11-23 02:03:49,074 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_create [2021-11-23 02:03:49,074 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_create [2021-11-23 02:03:49,074 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-23 02:03:49,074 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-23 02:03:49,075 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-23 02:03:49,075 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-23 02:03:49,075 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_poll [2021-11-23 02:03:49,075 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_poll [2021-11-23 02:03:49,075 INFO L130 BoogieDeclarations]: Found specification of procedure clear_bit [2021-11-23 02:03:49,076 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_bit [2021-11-23 02:03:49,076 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:03:49,076 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:03:49,076 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-23 02:03:49,076 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-23 02:03:49,076 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2021-11-23 02:03:49,077 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2021-11-23 02:03:49,077 INFO L130 BoogieDeclarations]: Found specification of procedure clear_wdm_read_flag [2021-11-23 02:03:49,077 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_wdm_read_flag [2021-11-23 02:03:49,077 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_cancel_work_sync_39 [2021-11-23 02:03:49,077 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_cancel_work_sync_39 [2021-11-23 02:03:49,077 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_write [2021-11-23 02:03:49,077 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_write [2021-11-23 02:03:49,078 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:03:49,078 INFO L130 BoogieDeclarations]: Found specification of procedure INIT_LIST_HEAD [2021-11-23 02:03:49,078 INFO L138 BoogieDeclarations]: Found implementation of procedure INIT_LIST_HEAD [2021-11-23 02:03:49,078 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_ioctl [2021-11-23 02:03:49,079 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_ioctl [2021-11-23 02:03:49,079 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_disconnect [2021-11-23 02:03:49,080 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_disconnect [2021-11-23 02:03:49,080 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:03:49,081 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_rlock_of_wdm_device [2021-11-23 02:03:49,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_rlock_of_wdm_device [2021-11-23 02:03:49,081 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-11-23 02:03:49,081 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-11-23 02:03:49,081 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock_interruptible [2021-11-23 02:03:49,081 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock_interruptible [2021-11-23 02:03:49,082 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_rxwork [2021-11-23 02:03:49,082 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_rxwork [2021-11-23 02:03:49,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:03:49,082 INFO L130 BoogieDeclarations]: Found specification of procedure disable_work_1 [2021-11-23 02:03:49,082 INFO L138 BoogieDeclarations]: Found implementation of procedure disable_work_1 [2021-11-23 02:03:49,082 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 02:03:49,082 INFO L130 BoogieDeclarations]: Found specification of procedure cancel_work_sync [2021-11-23 02:03:49,082 INFO L138 BoogieDeclarations]: Found implementation of procedure cancel_work_sync [2021-11-23 02:03:49,083 INFO L130 BoogieDeclarations]: Found specification of procedure __might_fault [2021-11-23 02:03:49,083 INFO L138 BoogieDeclarations]: Found implementation of procedure __might_fault [2021-11-23 02:03:49,083 INFO L130 BoogieDeclarations]: Found specification of procedure list_del [2021-11-23 02:03:49,083 INFO L138 BoogieDeclarations]: Found implementation of procedure list_del [2021-11-23 02:03:49,083 INFO L130 BoogieDeclarations]: Found specification of procedure __mutex_init [2021-11-23 02:03:49,083 INFO L138 BoogieDeclarations]: Found implementation of procedure __mutex_init [2021-11-23 02:03:49,084 INFO L130 BoogieDeclarations]: Found specification of procedure queue_work_on [2021-11-23 02:03:49,084 INFO L138 BoogieDeclarations]: Found implementation of procedure queue_work_on [2021-11-23 02:03:49,084 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2021-11-23 02:03:49,084 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2021-11-23 02:03:49,085 INFO L130 BoogieDeclarations]: Found specification of procedure _raw_spin_lock_irqsave [2021-11-23 02:03:49,085 INFO L138 BoogieDeclarations]: Found implementation of procedure _raw_spin_lock_irqsave [2021-11-23 02:03:49,085 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_wdm_mutex [2021-11-23 02:03:49,085 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_wdm_mutex [2021-11-23 02:03:49,085 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_wlock_of_wdm_device [2021-11-23 02:03:49,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_wlock_of_wdm_device [2021-11-23 02:03:49,087 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock [2021-11-23 02:03:49,087 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock [2021-11-23 02:03:49,087 INFO L130 BoogieDeclarations]: Found specification of procedure schedule [2021-11-23 02:03:49,087 INFO L138 BoogieDeclarations]: Found implementation of procedure schedule [2021-11-23 02:03:49,087 INFO L130 BoogieDeclarations]: Found specification of procedure usb_alloc_urb [2021-11-23 02:03:49,088 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_alloc_urb [2021-11-23 02:03:49,088 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_flush [2021-11-23 02:03:49,089 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_flush [2021-11-23 02:03:49,089 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_wlock_of_wdm_device [2021-11-23 02:03:49,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_wlock_of_wdm_device [2021-11-23 02:03:49,089 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~X~int~TO~int [2021-11-23 02:03:49,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~X~int~TO~int [2021-11-23 02:03:49,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-23 02:03:49,090 INFO L130 BoogieDeclarations]: Found specification of procedure usb_autopm_put_interface [2021-11-23 02:03:49,090 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_autopm_put_interface [2021-11-23 02:03:49,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:03:49,090 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-23 02:03:49,090 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-23 02:03:49,090 INFO L130 BoogieDeclarations]: Found specification of procedure constant_test_bit [2021-11-23 02:03:49,090 INFO L138 BoogieDeclarations]: Found implementation of procedure constant_test_bit [2021-11-23 02:03:49,091 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2021-11-23 02:03:49,091 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2021-11-23 02:03:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure kill_urbs [2021-11-23 02:03:49,142 INFO L138 BoogieDeclarations]: Found implementation of procedure kill_urbs [2021-11-23 02:03:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure prepare_to_wait_event [2021-11-23 02:03:49,142 INFO L138 BoogieDeclarations]: Found implementation of procedure prepare_to_wait_event [2021-11-23 02:03:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-23 02:03:49,142 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-23 02:03:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:03:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-23 02:03:49,143 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-23 02:03:49,143 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irq [2021-11-23 02:03:49,143 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irq [2021-11-23 02:03:49,143 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-23 02:03:49,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-23 02:03:49,143 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-23 02:03:49,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-23 02:03:49,143 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_resume [2021-11-23 02:03:49,144 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_resume [2021-11-23 02:03:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:03:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure test_and_set_bit [2021-11-23 02:03:49,144 INFO L138 BoogieDeclarations]: Found implementation of procedure test_and_set_bit [2021-11-23 02:03:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-23 02:03:49,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-23 02:03:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:03:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2021-11-23 02:03:49,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2021-11-23 02:03:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:03:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure spin_lock_irq [2021-11-23 02:03:49,145 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_lock_irq [2021-11-23 02:03:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure __wake_up [2021-11-23 02:03:49,145 INFO L138 BoogieDeclarations]: Found implementation of procedure __wake_up [2021-11-23 02:03:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2021-11-23 02:03:49,146 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2021-11-23 02:03:49,146 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 02:03:49,146 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 02:03:49,146 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_rlock_of_wdm_device [2021-11-23 02:03:49,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_rlock_of_wdm_device [2021-11-23 02:03:49,146 INFO L130 BoogieDeclarations]: Found specification of procedure schedule_work [2021-11-23 02:03:49,146 INFO L138 BoogieDeclarations]: Found implementation of procedure schedule_work [2021-11-23 02:03:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_find_device [2021-11-23 02:03:49,147 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_find_device [2021-11-23 02:03:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure spin_lock [2021-11-23 02:03:49,147 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_lock [2021-11-23 02:03:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure set_bit [2021-11-23 02:03:49,147 INFO L138 BoogieDeclarations]: Found implementation of procedure set_bit [2021-11-23 02:03:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:03:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure interface_to_usbdev [2021-11-23 02:03:49,148 INFO L138 BoogieDeclarations]: Found implementation of procedure interface_to_usbdev [2021-11-23 02:03:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure finish_wait [2021-11-23 02:03:49,148 INFO L138 BoogieDeclarations]: Found implementation of procedure finish_wait [2021-11-23 02:03:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:03:49,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:03:49,821 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:03:49,827 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:03:50,184 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-23 02:03:53,970 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:03:54,490 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:03:54,490 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:03:54,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:54 BoogieIcfgContainer [2021-11-23 02:03:54,496 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:03:54,497 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:03:54,498 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:03:54,501 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:03:54,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:03:45" (1/3) ... [2021-11-23 02:03:54,502 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4254c0ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:54, skipping insertion in model container [2021-11-23 02:03:54,502 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:48" (2/3) ... [2021-11-23 02:03:54,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4254c0ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:54, skipping insertion in model container [2021-11-23 02:03:54,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:54" (3/3) ... [2021-11-23 02:03:54,504 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:03:54,512 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:03:54,513 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:03:54,584 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:03:54,601 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:03:54,603 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:03:54,668 INFO L276 IsEmpty]: Start isEmpty. Operand has 861 states, 488 states have (on average 1.3176229508196722) internal successors, (643), 521 states have internal predecessors, (643), 301 states have call successors, (301), 71 states have call predecessors, (301), 70 states have return successors, (296), 295 states have call predecessors, (296), 296 states have call successors, (296) [2021-11-23 02:03:54,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 02:03:54,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:54,687 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:54,689 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:54,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:54,697 INFO L85 PathProgramCache]: Analyzing trace with hash -765085009, now seen corresponding path program 1 times [2021-11-23 02:03:54,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:54,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136541597] [2021-11-23 02:03:54,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:54,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:55,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:55,636 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-23 02:03:55,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:55,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136541597] [2021-11-23 02:03:55,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136541597] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:55,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:55,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:03:55,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428305733] [2021-11-23 02:03:55,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:55,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:55,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:55,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:55,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:03:55,704 INFO L87 Difference]: Start difference. First operand has 861 states, 488 states have (on average 1.3176229508196722) internal successors, (643), 521 states have internal predecessors, (643), 301 states have call successors, (301), 71 states have call predecessors, (301), 70 states have return successors, (296), 295 states have call predecessors, (296), 296 states have call successors, (296) Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-23 02:03:57,758 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:00,519 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:00,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:00,573 INFO L93 Difference]: Finished difference Result 2474 states and 3610 transitions. [2021-11-23 02:04:00,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:00,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) Word has length 140 [2021-11-23 02:04:00,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:00,613 INFO L225 Difference]: With dead ends: 2474 [2021-11-23 02:04:00,614 INFO L226 Difference]: Without dead ends: 1635 [2021-11-23 02:04:00,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:00,629 INFO L933 BasicCegarLoop]: 1363 mSDtfsCounter, 1116 mSDsluCounter, 1210 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1117 SdHoareTripleChecker+Valid, 2458 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:00,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1117 Valid, 2458 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 246 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 02:04:00,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1635 states. [2021-11-23 02:04:00,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1635 to 1624. [2021-11-23 02:04:00,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1624 states, 933 states have (on average 1.3054662379421222) internal successors, (1218), 973 states have internal predecessors, (1218), 553 states have call successors, (553), 138 states have call predecessors, (553), 137 states have return successors, (540), 536 states have call predecessors, (540), 539 states have call successors, (540) [2021-11-23 02:04:00,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1624 states to 1624 states and 2311 transitions. [2021-11-23 02:04:00,960 INFO L78 Accepts]: Start accepts. Automaton has 1624 states and 2311 transitions. Word has length 140 [2021-11-23 02:04:00,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:00,964 INFO L470 AbstractCegarLoop]: Abstraction has 1624 states and 2311 transitions. [2021-11-23 02:04:00,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 1 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-23 02:04:00,966 INFO L276 IsEmpty]: Start isEmpty. Operand 1624 states and 2311 transitions. [2021-11-23 02:04:00,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:04:00,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:00,982 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:00,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:04:00,983 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:00,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:00,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1720579061, now seen corresponding path program 1 times [2021-11-23 02:04:00,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:00,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942637588] [2021-11-23 02:04:00,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:00,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:01,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:01,315 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-23 02:04:01,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:01,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942637588] [2021-11-23 02:04:01,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942637588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:01,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:01,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:01,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217914946] [2021-11-23 02:04:01,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:01,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:01,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:01,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:01,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:01,333 INFO L87 Difference]: Start difference. First operand 1624 states and 2311 transitions. Second operand has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:03,363 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:06,173 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:06,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:06,234 INFO L93 Difference]: Finished difference Result 4038 states and 5682 transitions. [2021-11-23 02:04:06,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:06,235 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 145 [2021-11-23 02:04:06,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:06,257 INFO L225 Difference]: With dead ends: 4038 [2021-11-23 02:04:06,257 INFO L226 Difference]: Without dead ends: 2450 [2021-11-23 02:04:06,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:06,267 INFO L933 BasicCegarLoop]: 1225 mSDtfsCounter, 570 mSDsluCounter, 1172 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 571 SdHoareTripleChecker+Valid, 2284 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:06,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [571 Valid, 2284 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 275 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 02:04:06,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2450 states. [2021-11-23 02:04:06,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2450 to 2419. [2021-11-23 02:04:06,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2419 states, 1390 states have (on average 1.2992805755395684) internal successors, (1806), 1437 states have internal predecessors, (1806), 795 states have call successors, (795), 234 states have call predecessors, (795), 233 states have return successors, (784), 775 states have call predecessors, (784), 781 states have call successors, (784) [2021-11-23 02:04:06,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2419 states to 2419 states and 3385 transitions. [2021-11-23 02:04:06,422 INFO L78 Accepts]: Start accepts. Automaton has 2419 states and 3385 transitions. Word has length 145 [2021-11-23 02:04:06,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:06,423 INFO L470 AbstractCegarLoop]: Abstraction has 2419 states and 3385 transitions. [2021-11-23 02:04:06,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:06,423 INFO L276 IsEmpty]: Start isEmpty. Operand 2419 states and 3385 transitions. [2021-11-23 02:04:06,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-23 02:04:06,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:06,427 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:06,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:04:06,427 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:06,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:06,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1886891649, now seen corresponding path program 1 times [2021-11-23 02:04:06,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:06,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332460279] [2021-11-23 02:04:06,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:06,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:06,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:06,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:06,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332460279] [2021-11-23 02:04:06,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332460279] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:06,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:06,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:06,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312816429] [2021-11-23 02:04:06,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:06,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:06,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:06,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:06,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:06,684 INFO L87 Difference]: Start difference. First operand 2419 states and 3385 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:08,713 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:11,194 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:11,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:11,308 INFO L93 Difference]: Finished difference Result 2465 states and 3434 transitions. [2021-11-23 02:04:11,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:11,308 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 155 [2021-11-23 02:04:11,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:11,333 INFO L225 Difference]: With dead ends: 2465 [2021-11-23 02:04:11,333 INFO L226 Difference]: Without dead ends: 2462 [2021-11-23 02:04:11,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:11,337 INFO L933 BasicCegarLoop]: 1102 mSDtfsCounter, 1144 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1145 SdHoareTripleChecker+Valid, 1157 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:11,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1145 Valid, 1157 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 131 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 02:04:11,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2462 states. [2021-11-23 02:04:11,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2462 to 2462. [2021-11-23 02:04:11,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2462 states, 1411 states have (on average 1.2941176470588236) internal successors, (1826), 1458 states have internal predecessors, (1826), 807 states have call successors, (807), 243 states have call predecessors, (807), 243 states have return successors, (798), 788 states have call predecessors, (798), 794 states have call successors, (798) [2021-11-23 02:04:11,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2462 states to 2462 states and 3431 transitions. [2021-11-23 02:04:11,596 INFO L78 Accepts]: Start accepts. Automaton has 2462 states and 3431 transitions. Word has length 155 [2021-11-23 02:04:11,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:11,597 INFO L470 AbstractCegarLoop]: Abstraction has 2462 states and 3431 transitions. [2021-11-23 02:04:11,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:11,597 INFO L276 IsEmpty]: Start isEmpty. Operand 2462 states and 3431 transitions. [2021-11-23 02:04:11,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 02:04:11,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:11,602 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:11,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:04:11,602 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:11,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:11,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1636394630, now seen corresponding path program 1 times [2021-11-23 02:04:11,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:11,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948067455] [2021-11-23 02:04:11,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:11,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:11,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:11,938 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:11,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:11,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948067455] [2021-11-23 02:04:11,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948067455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:11,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:11,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:11,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458613825] [2021-11-23 02:04:11,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:11,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:11,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:11,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:11,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:11,948 INFO L87 Difference]: Start difference. First operand 2462 states and 3431 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:13,981 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:16,589 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:16,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:16,717 INFO L93 Difference]: Finished difference Result 2464 states and 3432 transitions. [2021-11-23 02:04:16,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:16,718 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 156 [2021-11-23 02:04:16,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:16,741 INFO L225 Difference]: With dead ends: 2464 [2021-11-23 02:04:16,741 INFO L226 Difference]: Without dead ends: 2461 [2021-11-23 02:04:16,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:16,748 INFO L933 BasicCegarLoop]: 1100 mSDtfsCounter, 1141 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1142 SdHoareTripleChecker+Valid, 1155 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:16,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1142 Valid, 1155 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 131 Invalid, 2 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 02:04:16,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2461 states. [2021-11-23 02:04:16,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2461 to 2461. [2021-11-23 02:04:16,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2461 states, 1411 states have (on average 1.293408929836995) internal successors, (1825), 1457 states have internal predecessors, (1825), 806 states have call successors, (806), 243 states have call predecessors, (806), 243 states have return successors, (798), 788 states have call predecessors, (798), 794 states have call successors, (798) [2021-11-23 02:04:16,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2461 states to 2461 states and 3429 transitions. [2021-11-23 02:04:16,943 INFO L78 Accepts]: Start accepts. Automaton has 2461 states and 3429 transitions. Word has length 156 [2021-11-23 02:04:16,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:16,944 INFO L470 AbstractCegarLoop]: Abstraction has 2461 states and 3429 transitions. [2021-11-23 02:04:16,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:16,945 INFO L276 IsEmpty]: Start isEmpty. Operand 2461 states and 3429 transitions. [2021-11-23 02:04:16,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 02:04:16,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:16,950 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:16,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:04:16,951 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:16,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:16,956 INFO L85 PathProgramCache]: Analyzing trace with hash 810885284, now seen corresponding path program 1 times [2021-11-23 02:04:16,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:16,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042014645] [2021-11-23 02:04:16,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:16,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:17,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:17,191 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:17,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:17,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042014645] [2021-11-23 02:04:17,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042014645] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:17,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:17,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:17,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339662836] [2021-11-23 02:04:17,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:17,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:17,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:17,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:17,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:17,198 INFO L87 Difference]: Start difference. First operand 2461 states and 3429 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:20,403 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:20,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:20,532 INFO L93 Difference]: Finished difference Result 2463 states and 3430 transitions. [2021-11-23 02:04:20,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:20,533 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 157 [2021-11-23 02:04:20,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:20,556 INFO L225 Difference]: With dead ends: 2463 [2021-11-23 02:04:20,556 INFO L226 Difference]: Without dead ends: 2460 [2021-11-23 02:04:20,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:20,560 INFO L933 BasicCegarLoop]: 1098 mSDtfsCounter, 1138 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1139 SdHoareTripleChecker+Valid, 1153 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:20,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1139 Valid, 1153 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 3.2s Time] [2021-11-23 02:04:20,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2460 states. [2021-11-23 02:04:20,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2460 to 2460. [2021-11-23 02:04:20,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2460 states, 1411 states have (on average 1.2927002126151665) internal successors, (1824), 1456 states have internal predecessors, (1824), 805 states have call successors, (805), 243 states have call predecessors, (805), 243 states have return successors, (798), 788 states have call predecessors, (798), 794 states have call successors, (798) [2021-11-23 02:04:20,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2460 states to 2460 states and 3427 transitions. [2021-11-23 02:04:20,789 INFO L78 Accepts]: Start accepts. Automaton has 2460 states and 3427 transitions. Word has length 157 [2021-11-23 02:04:20,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:20,793 INFO L470 AbstractCegarLoop]: Abstraction has 2460 states and 3427 transitions. [2021-11-23 02:04:20,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:20,794 INFO L276 IsEmpty]: Start isEmpty. Operand 2460 states and 3427 transitions. [2021-11-23 02:04:20,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 02:04:20,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:20,798 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:20,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:04:20,799 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:20,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:20,800 INFO L85 PathProgramCache]: Analyzing trace with hash 452220969, now seen corresponding path program 1 times [2021-11-23 02:04:20,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:20,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723475922] [2021-11-23 02:04:20,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:20,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:20,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:21,021 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-23 02:04:21,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:21,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723475922] [2021-11-23 02:04:21,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723475922] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:21,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:21,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:21,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849461323] [2021-11-23 02:04:21,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:21,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:21,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:21,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:21,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:21,025 INFO L87 Difference]: Start difference. First operand 2460 states and 3427 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-23 02:04:23,071 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:26,113 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:26,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:26,177 INFO L93 Difference]: Finished difference Result 6169 states and 8576 transitions. [2021-11-23 02:04:26,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:26,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 161 [2021-11-23 02:04:26,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:26,219 INFO L225 Difference]: With dead ends: 6169 [2021-11-23 02:04:26,219 INFO L226 Difference]: Without dead ends: 3745 [2021-11-23 02:04:26,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:26,236 INFO L933 BasicCegarLoop]: 1552 mSDtfsCounter, 772 mSDsluCounter, 1181 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 772 SdHoareTripleChecker+Valid, 2622 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:26,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [772 Valid, 2622 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 300 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:04:26,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3745 states. [2021-11-23 02:04:26,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3745 to 3724. [2021-11-23 02:04:26,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3724 states, 2175 states have (on average 1.3002298850574712) internal successors, (2828), 2248 states have internal predecessors, (2828), 1177 states have call successors, (1177), 371 states have call predecessors, (1177), 371 states have return successors, (1170), 1156 states have call predecessors, (1170), 1166 states have call successors, (1170) [2021-11-23 02:04:26,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3724 states to 3724 states and 5175 transitions. [2021-11-23 02:04:26,565 INFO L78 Accepts]: Start accepts. Automaton has 3724 states and 5175 transitions. Word has length 161 [2021-11-23 02:04:26,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:26,565 INFO L470 AbstractCegarLoop]: Abstraction has 3724 states and 5175 transitions. [2021-11-23 02:04:26,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 2 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-23 02:04:26,567 INFO L276 IsEmpty]: Start isEmpty. Operand 3724 states and 5175 transitions. [2021-11-23 02:04:26,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-23 02:04:26,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:26,574 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:26,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:04:26,575 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:26,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:26,575 INFO L85 PathProgramCache]: Analyzing trace with hash -632843843, now seen corresponding path program 1 times [2021-11-23 02:04:26,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:26,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111123980] [2021-11-23 02:04:26,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:26,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:26,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:26,808 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:26,808 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:26,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111123980] [2021-11-23 02:04:26,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111123980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:26,809 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:26,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:26,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203780299] [2021-11-23 02:04:26,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:26,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:26,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:26,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:26,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:26,811 INFO L87 Difference]: Start difference. First operand 3724 states and 5175 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:28,839 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:31,994 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:32,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:32,048 INFO L93 Difference]: Finished difference Result 10472 states and 14478 transitions. [2021-11-23 02:04:32,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:32,048 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 158 [2021-11-23 02:04:32,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:32,113 INFO L225 Difference]: With dead ends: 10472 [2021-11-23 02:04:32,114 INFO L226 Difference]: Without dead ends: 6784 [2021-11-23 02:04:32,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:32,136 INFO L933 BasicCegarLoop]: 1354 mSDtfsCounter, 954 mSDsluCounter, 1101 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 955 SdHoareTripleChecker+Valid, 2345 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:32,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [955 Valid, 2345 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 249 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:04:32,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6784 states. [2021-11-23 02:04:32,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6784 to 6754. [2021-11-23 02:04:32,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6754 states, 3972 states have (on average 1.3001007049345419) internal successors, (5164), 4098 states have internal predecessors, (5164), 2074 states have call successors, (2074), 716 states have call predecessors, (2074), 707 states have return successors, (2070), 2023 states have call predecessors, (2070), 2062 states have call successors, (2070) [2021-11-23 02:04:32,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6754 states to 6754 states and 9308 transitions. [2021-11-23 02:04:32,642 INFO L78 Accepts]: Start accepts. Automaton has 6754 states and 9308 transitions. Word has length 158 [2021-11-23 02:04:32,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:32,643 INFO L470 AbstractCegarLoop]: Abstraction has 6754 states and 9308 transitions. [2021-11-23 02:04:32,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:32,644 INFO L276 IsEmpty]: Start isEmpty. Operand 6754 states and 9308 transitions. [2021-11-23 02:04:32,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 02:04:32,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:32,648 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:32,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:04:32,648 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:32,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:32,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1856198343, now seen corresponding path program 1 times [2021-11-23 02:04:32,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:32,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006303112] [2021-11-23 02:04:32,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:32,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:32,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:32,936 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:32,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:32,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006303112] [2021-11-23 02:04:32,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006303112] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:32,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:32,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:32,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191694496] [2021-11-23 02:04:32,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:32,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:32,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:32,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:32,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:32,940 INFO L87 Difference]: Start difference. First operand 6754 states and 9308 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:35,014 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:37,784 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:37,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:37,930 INFO L93 Difference]: Finished difference Result 7362 states and 9806 transitions. [2021-11-23 02:04:37,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:37,931 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 159 [2021-11-23 02:04:37,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:38,012 INFO L225 Difference]: With dead ends: 7362 [2021-11-23 02:04:38,021 INFO L226 Difference]: Without dead ends: 7358 [2021-11-23 02:04:38,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:38,028 INFO L933 BasicCegarLoop]: 1096 mSDtfsCounter, 950 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 951 SdHoareTripleChecker+Valid, 1347 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:38,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [951 Valid, 1347 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 02:04:38,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7358 states. [2021-11-23 02:04:38,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7358 to 7352. [2021-11-23 02:04:38,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7352 states, 4298 states have (on average 1.2794322940902745) internal successors, (5499), 4418 states have internal predecessors, (5499), 2144 states have call successors, (2144), 922 states have call predecessors, (2144), 909 states have return successors, (2142), 2095 states have call predecessors, (2142), 2134 states have call successors, (2142) [2021-11-23 02:04:38,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7352 states to 7352 states and 9785 transitions. [2021-11-23 02:04:38,469 INFO L78 Accepts]: Start accepts. Automaton has 7352 states and 9785 transitions. Word has length 159 [2021-11-23 02:04:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:38,470 INFO L470 AbstractCegarLoop]: Abstraction has 7352 states and 9785 transitions. [2021-11-23 02:04:38,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:38,471 INFO L276 IsEmpty]: Start isEmpty. Operand 7352 states and 9785 transitions. [2021-11-23 02:04:38,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 02:04:38,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:38,474 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:38,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:04:38,475 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:38,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:38,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1707099648, now seen corresponding path program 1 times [2021-11-23 02:04:38,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:38,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009735081] [2021-11-23 02:04:38,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:38,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:38,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:38,721 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:38,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:38,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009735081] [2021-11-23 02:04:38,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009735081] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:38,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:38,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:38,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863995679] [2021-11-23 02:04:38,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:38,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:38,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:38,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:38,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:38,726 INFO L87 Difference]: Start difference. First operand 7352 states and 9785 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:40,758 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:44,314 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:44,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:44,364 INFO L93 Difference]: Finished difference Result 20172 states and 26941 transitions. [2021-11-23 02:04:44,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:44,365 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 160 [2021-11-23 02:04:44,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:44,437 INFO L225 Difference]: With dead ends: 20172 [2021-11-23 02:04:44,438 INFO L226 Difference]: Without dead ends: 12849 [2021-11-23 02:04:44,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:44,480 INFO L933 BasicCegarLoop]: 1490 mSDtfsCounter, 994 mSDsluCounter, 1035 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 6 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 995 SdHoareTripleChecker+Valid, 2419 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:44,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [995 Valid, 2419 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 268 Invalid, 2 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 02:04:44,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12849 states. [2021-11-23 02:04:45,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12849 to 12792. [2021-11-23 02:04:45,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12792 states, 7577 states have (on average 1.2924640358981128) internal successors, (9793), 7789 states have internal predecessors, (9793), 3633 states have call successors, (3633), 1625 states have call predecessors, (3633), 1581 states have return successors, (3670), 3517 states have call predecessors, (3670), 3622 states have call successors, (3670) [2021-11-23 02:04:45,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12792 states to 12792 states and 17096 transitions. [2021-11-23 02:04:45,412 INFO L78 Accepts]: Start accepts. Automaton has 12792 states and 17096 transitions. Word has length 160 [2021-11-23 02:04:45,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:45,413 INFO L470 AbstractCegarLoop]: Abstraction has 12792 states and 17096 transitions. [2021-11-23 02:04:45,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 3 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 02:04:45,413 INFO L276 IsEmpty]: Start isEmpty. Operand 12792 states and 17096 transitions. [2021-11-23 02:04:45,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-23 02:04:45,421 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:45,422 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:45,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:04:45,422 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:45,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:45,423 INFO L85 PathProgramCache]: Analyzing trace with hash 2115643624, now seen corresponding path program 1 times [2021-11-23 02:04:45,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:45,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368355174] [2021-11-23 02:04:45,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:45,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:45,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:45,589 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2021-11-23 02:04:45,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:45,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368355174] [2021-11-23 02:04:45,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368355174] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:45,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:45,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:45,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373451321] [2021-11-23 02:04:45,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:45,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:45,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:45,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:45,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:45,593 INFO L87 Difference]: Start difference. First operand 12792 states and 17096 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 02:04:47,619 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:50,697 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:50,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:50,746 INFO L93 Difference]: Finished difference Result 19425 states and 25936 transitions. [2021-11-23 02:04:50,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:50,748 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 199 [2021-11-23 02:04:50,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:50,788 INFO L225 Difference]: With dead ends: 19425 [2021-11-23 02:04:50,788 INFO L226 Difference]: Without dead ends: 6667 [2021-11-23 02:04:50,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:50,860 INFO L933 BasicCegarLoop]: 1092 mSDtfsCounter, 12 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 2170 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:50,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 2170 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 239 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:04:50,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6667 states. [2021-11-23 02:04:51,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6667 to 6591. [2021-11-23 02:04:51,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6591 states, 3906 states have (on average 1.2939068100358424) internal successors, (5054), 4018 states have internal predecessors, (5054), 1868 states have call successors, (1868), 839 states have call predecessors, (1868), 816 states have return successors, (1881), 1804 states have call predecessors, (1881), 1857 states have call successors, (1881) [2021-11-23 02:04:51,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6591 states to 6591 states and 8803 transitions. [2021-11-23 02:04:51,441 INFO L78 Accepts]: Start accepts. Automaton has 6591 states and 8803 transitions. Word has length 199 [2021-11-23 02:04:51,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:51,442 INFO L470 AbstractCegarLoop]: Abstraction has 6591 states and 8803 transitions. [2021-11-23 02:04:51,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 02:04:51,443 INFO L276 IsEmpty]: Start isEmpty. Operand 6591 states and 8803 transitions. [2021-11-23 02:04:51,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-23 02:04:51,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:51,451 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:51,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:04:51,451 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:51,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:51,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1566864886, now seen corresponding path program 1 times [2021-11-23 02:04:51,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:51,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018196177] [2021-11-23 02:04:51,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:51,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:51,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:51,690 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 558 trivial. 0 not checked. [2021-11-23 02:04:51,690 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:51,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018196177] [2021-11-23 02:04:51,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018196177] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:51,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:51,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:51,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709587125] [2021-11-23 02:04:51,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:51,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:51,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:51,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:51,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:51,694 INFO L87 Difference]: Start difference. First operand 6591 states and 8803 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:04:53,729 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:57,080 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:04:57,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:57,119 INFO L93 Difference]: Finished difference Result 16346 states and 21745 transitions. [2021-11-23 02:04:57,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:57,119 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 205 [2021-11-23 02:04:57,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:57,166 INFO L225 Difference]: With dead ends: 16346 [2021-11-23 02:04:57,167 INFO L226 Difference]: Without dead ends: 9880 [2021-11-23 02:04:57,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:57,203 INFO L933 BasicCegarLoop]: 1504 mSDtfsCounter, 868 mSDsluCounter, 1087 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 20 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 869 SdHoareTripleChecker+Valid, 2481 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:57,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [869 Valid, 2481 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 304 Invalid, 2 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 02:04:57,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9880 states. [2021-11-23 02:04:57,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9880 to 9772. [2021-11-23 02:04:57,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9772 states, 5834 states have (on average 1.286252999657182) internal successors, (7504), 5998 states have internal predecessors, (7504), 2690 states have call successors, (2690), 1282 states have call predecessors, (2690), 1247 states have return successors, (2707), 2603 states have call predecessors, (2707), 2679 states have call successors, (2707) [2021-11-23 02:04:57,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9772 states to 9772 states and 12901 transitions. [2021-11-23 02:04:57,791 INFO L78 Accepts]: Start accepts. Automaton has 9772 states and 12901 transitions. Word has length 205 [2021-11-23 02:04:57,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:57,792 INFO L470 AbstractCegarLoop]: Abstraction has 9772 states and 12901 transitions. [2021-11-23 02:04:57,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-23 02:04:57,792 INFO L276 IsEmpty]: Start isEmpty. Operand 9772 states and 12901 transitions. [2021-11-23 02:04:57,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-23 02:04:57,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:57,798 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:57,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:04:57,799 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:57,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:57,799 INFO L85 PathProgramCache]: Analyzing trace with hash -103223306, now seen corresponding path program 1 times [2021-11-23 02:04:57,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:57,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372940717] [2021-11-23 02:04:57,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:57,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:57,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:58,020 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-23 02:04:58,020 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:58,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372940717] [2021-11-23 02:04:58,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372940717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:58,021 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:58,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:58,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743825362] [2021-11-23 02:04:58,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:58,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:58,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:58,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:58,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:58,023 INFO L87 Difference]: Start difference. First operand 9772 states and 12901 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) [2021-11-23 02:05:01,046 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:03,826 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:03,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:03,865 INFO L93 Difference]: Finished difference Result 9780 states and 12907 transitions. [2021-11-23 02:05:03,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:05:03,865 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) Word has length 212 [2021-11-23 02:05:03,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:03,923 INFO L225 Difference]: With dead ends: 9780 [2021-11-23 02:05:03,923 INFO L226 Difference]: Without dead ends: 9777 [2021-11-23 02:05:03,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:05:03,932 INFO L933 BasicCegarLoop]: 1099 mSDtfsCounter, 248 mSDsluCounter, 1016 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 2007 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:03,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 2007 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 251 Invalid, 2 Unknown, 0 Unchecked, 5.6s Time] [2021-11-23 02:05:03,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9777 states. [2021-11-23 02:05:04,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9777 to 9771. [2021-11-23 02:05:04,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9771 states, 5834 states have (on average 1.2840246828933837) internal successors, (7491), 5997 states have internal predecessors, (7491), 2689 states have call successors, (2689), 1282 states have call predecessors, (2689), 1247 states have return successors, (2707), 2603 states have call predecessors, (2707), 2679 states have call successors, (2707) [2021-11-23 02:05:04,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9771 states to 9771 states and 12887 transitions. [2021-11-23 02:05:04,580 INFO L78 Accepts]: Start accepts. Automaton has 9771 states and 12887 transitions. Word has length 212 [2021-11-23 02:05:04,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:04,581 INFO L470 AbstractCegarLoop]: Abstraction has 9771 states and 12887 transitions. [2021-11-23 02:05:04,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (25), 2 states have call predecessors, (25), 2 states have call successors, (25) [2021-11-23 02:05:04,582 INFO L276 IsEmpty]: Start isEmpty. Operand 9771 states and 12887 transitions. [2021-11-23 02:05:04,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2021-11-23 02:05:04,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:04,590 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:04,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:05:04,591 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:04,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:04,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1777363037, now seen corresponding path program 1 times [2021-11-23 02:05:04,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:04,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941766086] [2021-11-23 02:05:04,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:04,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:04,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:04,807 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 558 trivial. 0 not checked. [2021-11-23 02:05:04,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:04,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941766086] [2021-11-23 02:05:04,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941766086] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:04,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:04,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:05:04,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374631666] [2021-11-23 02:05:04,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:04,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:05:04,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:04,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:05:04,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:05:04,811 INFO L87 Difference]: Start difference. First operand 9771 states and 12887 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 3 states have call predecessors, (28), 3 states have call successors, (28) [2021-11-23 02:05:06,843 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:09,992 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:10,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:10,032 INFO L93 Difference]: Finished difference Result 22801 states and 30073 transitions. [2021-11-23 02:05:10,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:05:10,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 3 states have call predecessors, (28), 3 states have call successors, (28) Word has length 223 [2021-11-23 02:05:10,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:10,097 INFO L225 Difference]: With dead ends: 22801 [2021-11-23 02:05:10,097 INFO L226 Difference]: Without dead ends: 13163 [2021-11-23 02:05:10,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:05:10,230 INFO L933 BasicCegarLoop]: 1438 mSDtfsCounter, 898 mSDsluCounter, 1070 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 9 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 899 SdHoareTripleChecker+Valid, 2408 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:10,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [899 Valid, 2408 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 275 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:05:10,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13163 states. [2021-11-23 02:05:10,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13163 to 13137. [2021-11-23 02:05:10,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13137 states, 7972 states have (on average 1.288509784244857) internal successors, (10272), 8201 states have internal predecessors, (10272), 3477 states have call successors, (3477), 1726 states have call predecessors, (3477), 1687 states have return successors, (3503), 3375 states have call predecessors, (3503), 3467 states have call successors, (3503) [2021-11-23 02:05:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13137 states to 13137 states and 17252 transitions. [2021-11-23 02:05:10,976 INFO L78 Accepts]: Start accepts. Automaton has 13137 states and 17252 transitions. Word has length 223 [2021-11-23 02:05:10,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:10,977 INFO L470 AbstractCegarLoop]: Abstraction has 13137 states and 17252 transitions. [2021-11-23 02:05:10,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (28), 3 states have call predecessors, (28), 3 states have call successors, (28) [2021-11-23 02:05:10,978 INFO L276 IsEmpty]: Start isEmpty. Operand 13137 states and 17252 transitions. [2021-11-23 02:05:10,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2021-11-23 02:05:10,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:10,987 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:10,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:05:10,987 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:10,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:10,988 INFO L85 PathProgramCache]: Analyzing trace with hash -938473692, now seen corresponding path program 1 times [2021-11-23 02:05:10,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:10,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938899185] [2021-11-23 02:05:10,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:10,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:11,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:11,370 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-23 02:05:11,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:11,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938899185] [2021-11-23 02:05:11,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938899185] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:11,371 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:11,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:05:11,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524398223] [2021-11-23 02:05:11,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:11,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:11,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:11,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:11,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:11,374 INFO L87 Difference]: Start difference. First operand 13137 states and 17252 transitions. Second operand has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 1 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-23 02:05:14,351 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:17,976 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:18,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:18,192 INFO L93 Difference]: Finished difference Result 31726 states and 41719 transitions. [2021-11-23 02:05:18,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:05:18,193 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 1 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) Word has length 232 [2021-11-23 02:05:18,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:18,267 INFO L225 Difference]: With dead ends: 31726 [2021-11-23 02:05:18,268 INFO L226 Difference]: Without dead ends: 18722 [2021-11-23 02:05:18,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:05:18,311 INFO L933 BasicCegarLoop]: 1778 mSDtfsCounter, 1010 mSDsluCounter, 2115 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1012 SdHoareTripleChecker+Valid, 3673 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:18,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1012 Valid, 3673 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 455 Invalid, 2 Unknown, 0 Unchecked, 6.0s Time] [2021-11-23 02:05:18,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18722 states. [2021-11-23 02:05:19,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18722 to 18572. [2021-11-23 02:05:19,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18572 states, 11317 states have (on average 1.2930988777944685) internal successors, (14634), 11679 states have internal predecessors, (14634), 4853 states have call successors, (4853), 2435 states have call predecessors, (4853), 2401 states have return successors, (4893), 4689 states have call predecessors, (4893), 4827 states have call successors, (4893) [2021-11-23 02:05:19,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18572 states to 18572 states and 24380 transitions. [2021-11-23 02:05:19,568 INFO L78 Accepts]: Start accepts. Automaton has 18572 states and 24380 transitions. Word has length 232 [2021-11-23 02:05:19,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:19,569 INFO L470 AbstractCegarLoop]: Abstraction has 18572 states and 24380 transitions. [2021-11-23 02:05:19,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 3 states have call successors, (33), 3 states have call predecessors, (33), 1 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-23 02:05:19,570 INFO L276 IsEmpty]: Start isEmpty. Operand 18572 states and 24380 transitions. [2021-11-23 02:05:19,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-11-23 02:05:19,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:19,583 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:19,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:05:19,583 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:19,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:19,584 INFO L85 PathProgramCache]: Analyzing trace with hash -633882516, now seen corresponding path program 1 times [2021-11-23 02:05:19,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:19,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327447629] [2021-11-23 02:05:19,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:19,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:19,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:20,042 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2021-11-23 02:05:20,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:20,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327447629] [2021-11-23 02:05:20,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327447629] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:20,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445037030] [2021-11-23 02:05:20,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:20,043 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:20,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:20,046 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:05:20,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:05:20,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:20,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 2664 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:05:20,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:05:22,079 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 216 proven. 0 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-23 02:05:22,079 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:05:22,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445037030] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:22,080 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:05:22,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:05:22,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787122081] [2021-11-23 02:05:22,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:22,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:05:22,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:22,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:05:22,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:05:22,083 INFO L87 Difference]: Start difference. First operand 18572 states and 24380 transitions. Second operand has 5 states, 5 states have (on average 15.4) internal successors, (77), 4 states have internal predecessors, (77), 3 states have call successors, (32), 3 states have call predecessors, (32), 3 states have return successors, (30), 3 states have call predecessors, (30), 3 states have call successors, (30) [2021-11-23 02:05:24,121 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:30,922 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:30,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:30,969 INFO L93 Difference]: Finished difference Result 40396 states and 53211 transitions. [2021-11-23 02:05:30,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:05:30,970 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.4) internal successors, (77), 4 states have internal predecessors, (77), 3 states have call successors, (32), 3 states have call predecessors, (32), 3 states have return successors, (30), 3 states have call predecessors, (30), 3 states have call successors, (30) Word has length 233 [2021-11-23 02:05:30,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:31,044 INFO L225 Difference]: With dead ends: 40396 [2021-11-23 02:05:31,045 INFO L226 Difference]: Without dead ends: 21957 [2021-11-23 02:05:31,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 234 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:05:31,096 INFO L933 BasicCegarLoop]: 1789 mSDtfsCounter, 1823 mSDsluCounter, 2385 mSDsCounter, 0 mSdLazyCounter, 1373 mSolverCounterSat, 37 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1880 SdHoareTripleChecker+Valid, 3877 SdHoareTripleChecker+Invalid, 1412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1373 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:31,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1880 Valid, 3877 Invalid, 1412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1373 Invalid, 2 Unknown, 0 Unchecked, 7.7s Time] [2021-11-23 02:05:31,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21957 states. [2021-11-23 02:05:32,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21957 to 21026. [2021-11-23 02:05:32,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21026 states, 12913 states have (on average 1.297219855959111) internal successors, (16751), 13333 states have internal predecessors, (16751), 5405 states have call successors, (5405), 2741 states have call predecessors, (5405), 2707 states have return successors, (5461), 5225 states have call predecessors, (5461), 5379 states have call successors, (5461) [2021-11-23 02:05:32,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21026 states to 21026 states and 27617 transitions. [2021-11-23 02:05:32,471 INFO L78 Accepts]: Start accepts. Automaton has 21026 states and 27617 transitions. Word has length 233 [2021-11-23 02:05:32,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:32,472 INFO L470 AbstractCegarLoop]: Abstraction has 21026 states and 27617 transitions. [2021-11-23 02:05:32,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.4) internal successors, (77), 4 states have internal predecessors, (77), 3 states have call successors, (32), 3 states have call predecessors, (32), 3 states have return successors, (30), 3 states have call predecessors, (30), 3 states have call successors, (30) [2021-11-23 02:05:32,472 INFO L276 IsEmpty]: Start isEmpty. Operand 21026 states and 27617 transitions. [2021-11-23 02:05:32,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2021-11-23 02:05:32,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:32,489 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:32,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:05:32,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:05:32,703 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:32,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:32,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1365259453, now seen corresponding path program 1 times [2021-11-23 02:05:32,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:32,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294539435] [2021-11-23 02:05:32,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:32,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:32,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:33,194 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-23 02:05:33,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:33,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294539435] [2021-11-23 02:05:33,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294539435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:33,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:05:33,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 02:05:33,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008132931] [2021-11-23 02:05:33,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:33,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:05:33,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:33,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:05:33,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:05:33,199 INFO L87 Difference]: Start difference. First operand 21026 states and 27617 transitions. Second operand has 7 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 2 states have call successors, (32), 2 states have call predecessors, (32), 4 states have return successors, (31), 4 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:05:35,235 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:40,489 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:40,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:40,546 INFO L93 Difference]: Finished difference Result 42339 states and 55738 transitions. [2021-11-23 02:05:40,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:05:40,547 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 2 states have call successors, (32), 2 states have call predecessors, (32), 4 states have return successors, (31), 4 states have call predecessors, (31), 2 states have call successors, (31) Word has length 244 [2021-11-23 02:05:40,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:40,630 INFO L225 Difference]: With dead ends: 42339 [2021-11-23 02:05:40,630 INFO L226 Difference]: Without dead ends: 21446 [2021-11-23 02:05:40,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:05:40,691 INFO L933 BasicCegarLoop]: 1084 mSDtfsCounter, 3 mSDsluCounter, 5998 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6498 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:40,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6498 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 724 Invalid, 2 Unknown, 0 Unchecked, 6.2s Time] [2021-11-23 02:05:40,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21446 states. [2021-11-23 02:05:41,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21446 to 21302. [2021-11-23 02:05:41,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21302 states, 13101 states have (on average 1.2929547362796734) internal successors, (16939), 13521 states have internal predecessors, (16939), 5405 states have call successors, (5405), 2741 states have call predecessors, (5405), 2795 states have return successors, (5633), 5313 states have call predecessors, (5633), 5379 states have call successors, (5633) [2021-11-23 02:05:41,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21302 states to 21302 states and 27977 transitions. [2021-11-23 02:05:41,960 INFO L78 Accepts]: Start accepts. Automaton has 21302 states and 27977 transitions. Word has length 244 [2021-11-23 02:05:41,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:41,961 INFO L470 AbstractCegarLoop]: Abstraction has 21302 states and 27977 transitions. [2021-11-23 02:05:41,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 2 states have call successors, (32), 2 states have call predecessors, (32), 4 states have return successors, (31), 4 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:05:41,961 INFO L276 IsEmpty]: Start isEmpty. Operand 21302 states and 27977 transitions. [2021-11-23 02:05:41,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-23 02:05:41,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:41,977 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:41,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:05:41,978 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:41,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:41,978 INFO L85 PathProgramCache]: Analyzing trace with hash -365454954, now seen corresponding path program 1 times [2021-11-23 02:05:41,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:41,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417059604] [2021-11-23 02:05:41,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:41,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:42,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:42,350 INFO L134 CoverageAnalysis]: Checked inductivity of 589 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 573 trivial. 0 not checked. [2021-11-23 02:05:42,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:42,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417059604] [2021-11-23 02:05:42,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417059604] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:42,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722512080] [2021-11-23 02:05:42,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:42,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:42,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:42,355 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:05:42,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:05:43,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:43,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 2769 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:05:43,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:05:43,976 INFO L134 CoverageAnalysis]: Checked inductivity of 589 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2021-11-23 02:05:43,977 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:05:43,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722512080] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:43,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:05:43,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 02:05:43,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631269969] [2021-11-23 02:05:43,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:43,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:05:43,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:43,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:05:43,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:05:43,981 INFO L87 Difference]: Start difference. First operand 21302 states and 27977 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:05:46,014 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:51,639 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:05:51,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:51,724 INFO L93 Difference]: Finished difference Result 49476 states and 65000 transitions. [2021-11-23 02:05:51,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:05:51,726 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 248 [2021-11-23 02:05:51,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:51,857 INFO L225 Difference]: With dead ends: 49476 [2021-11-23 02:05:51,857 INFO L226 Difference]: Without dead ends: 28299 [2021-11-23 02:05:51,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:05:51,930 INFO L933 BasicCegarLoop]: 1798 mSDtfsCounter, 974 mSDsluCounter, 2588 mSDsCounter, 0 mSdLazyCounter, 1025 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 977 SdHoareTripleChecker+Valid, 4078 SdHoareTripleChecker+Invalid, 1034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1025 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:51,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [977 Valid, 4078 Invalid, 1034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1025 Invalid, 2 Unknown, 0 Unchecked, 6.4s Time] [2021-11-23 02:05:51,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28299 states. [2021-11-23 02:05:53,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28299 to 27521. [2021-11-23 02:05:53,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27521 states, 17038 states have (on average 1.2991548303791525) internal successors, (22135), 17599 states have internal predecessors, (22135), 6906 states have call successors, (6906), 3470 states have call predecessors, (6906), 3576 states have return successors, (7232), 6813 states have call predecessors, (7232), 6880 states have call successors, (7232) [2021-11-23 02:05:53,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27521 states to 27521 states and 36273 transitions. [2021-11-23 02:05:53,682 INFO L78 Accepts]: Start accepts. Automaton has 27521 states and 36273 transitions. Word has length 248 [2021-11-23 02:05:53,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:53,683 INFO L470 AbstractCegarLoop]: Abstraction has 27521 states and 36273 transitions. [2021-11-23 02:05:53,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 3 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:05:53,683 INFO L276 IsEmpty]: Start isEmpty. Operand 27521 states and 36273 transitions. [2021-11-23 02:05:53,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-11-23 02:05:53,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:53,698 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:53,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:05:53,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:05:53,911 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:53,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:53,912 INFO L85 PathProgramCache]: Analyzing trace with hash 12476780, now seen corresponding path program 1 times [2021-11-23 02:05:53,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:53,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608917674] [2021-11-23 02:05:53,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:53,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:54,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:54,255 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2021-11-23 02:05:54,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:54,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608917674] [2021-11-23 02:05:54,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608917674] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:54,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228473968] [2021-11-23 02:05:54,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:54,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:54,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:54,258 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:05:54,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:05:55,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:55,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 2744 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:05:55,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:05:55,875 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 166 proven. 1 refuted. 0 times theorem prover too weak. 404 trivial. 0 not checked. [2021-11-23 02:05:55,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:05:57,026 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 563 trivial. 0 not checked. [2021-11-23 02:05:57,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228473968] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:57,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:05:57,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 13 [2021-11-23 02:05:57,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53258526] [2021-11-23 02:05:57,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:57,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:05:57,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:57,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:05:57,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:05:57,028 INFO L87 Difference]: Start difference. First operand 27521 states and 36273 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 4 states have call predecessors, (30), 4 states have call successors, (30) [2021-11-23 02:06:05,167 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:05,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:05,236 INFO L93 Difference]: Finished difference Result 59950 states and 80748 transitions. [2021-11-23 02:06:05,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:05,236 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 4 states have call predecessors, (30), 4 states have call successors, (30) Word has length 246 [2021-11-23 02:06:05,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:05,448 INFO L225 Difference]: With dead ends: 59950 [2021-11-23 02:06:05,448 INFO L226 Difference]: Without dead ends: 32562 [2021-11-23 02:06:05,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:06:05,490 INFO L933 BasicCegarLoop]: 1450 mSDtfsCounter, 1885 mSDsluCounter, 2161 mSDsCounter, 0 mSdLazyCounter, 1443 mSolverCounterSat, 558 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2015 SdHoareTripleChecker+Valid, 3300 SdHoareTripleChecker+Invalid, 2002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 558 IncrementalHoareTripleChecker+Valid, 1443 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:05,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2015 Valid, 3300 Invalid, 2002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [558 Valid, 1443 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2021-11-23 02:06:05,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32562 states. [2021-11-23 02:06:06,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32562 to 27211. [2021-11-23 02:06:06,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27211 states, 17052 states have (on average 1.307940417546329) internal successors, (22303), 17560 states have internal predecessors, (22303), 6658 states have call successors, (6658), 3427 states have call predecessors, (6658), 3500 states have return successors, (6896), 6532 states have call predecessors, (6896), 6628 states have call successors, (6896) [2021-11-23 02:06:06,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27211 states to 27211 states and 35857 transitions. [2021-11-23 02:06:06,659 INFO L78 Accepts]: Start accepts. Automaton has 27211 states and 35857 transitions. Word has length 246 [2021-11-23 02:06:06,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:06,660 INFO L470 AbstractCegarLoop]: Abstraction has 27211 states and 35857 transitions. [2021-11-23 02:06:06,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 4 states have call predecessors, (30), 4 states have call successors, (30) [2021-11-23 02:06:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 27211 states and 35857 transitions. [2021-11-23 02:06:06,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-23 02:06:06,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:06,671 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:06,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:06,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:06:06,899 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:06,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:06,900 INFO L85 PathProgramCache]: Analyzing trace with hash -52269685, now seen corresponding path program 1 times [2021-11-23 02:06:06,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:06,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397746015] [2021-11-23 02:06:06,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:06,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:07,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:07,220 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2021-11-23 02:06:07,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397746015] [2021-11-23 02:06:07,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397746015] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:07,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952701121] [2021-11-23 02:06:07,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:07,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:07,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:07,223 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:07,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:06:07,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:07,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 2846 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:06:07,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:08,842 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 216 proven. 0 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-23 02:06:08,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:06:08,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952701121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:08,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:06:08,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 14 [2021-11-23 02:06:08,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896902789] [2021-11-23 02:06:08,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:08,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:06:08,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:08,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:06:08,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:06:08,845 INFO L87 Difference]: Start difference. First operand 27211 states and 35857 transitions. Second operand has 8 states, 8 states have (on average 11.25) internal successors, (90), 6 states have internal predecessors, (90), 4 states have call successors, (35), 3 states have call predecessors, (35), 4 states have return successors, (33), 5 states have call predecessors, (33), 4 states have call successors, (33) [2021-11-23 02:06:11,442 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:17,329 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:17,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:17,558 INFO L93 Difference]: Finished difference Result 57872 states and 76369 transitions. [2021-11-23 02:06:17,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:06:17,558 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 6 states have internal predecessors, (90), 4 states have call successors, (35), 3 states have call predecessors, (35), 4 states have return successors, (33), 5 states have call predecessors, (33), 4 states have call successors, (33) Word has length 252 [2021-11-23 02:06:17,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:17,628 INFO L225 Difference]: With dead ends: 57872 [2021-11-23 02:06:17,628 INFO L226 Difference]: Without dead ends: 30796 [2021-11-23 02:06:17,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 250 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:06:17,673 INFO L933 BasicCegarLoop]: 1860 mSDtfsCounter, 1917 mSDsluCounter, 4144 mSDsCounter, 0 mSdLazyCounter, 2822 mSolverCounterSat, 105 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1994 SdHoareTripleChecker+Valid, 5431 SdHoareTripleChecker+Invalid, 2928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 2822 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:17,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1994 Valid, 5431 Invalid, 2928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 2822 Invalid, 1 Unknown, 0 Unchecked, 7.6s Time] [2021-11-23 02:06:17,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30796 states. [2021-11-23 02:06:18,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30796 to 27222. [2021-11-23 02:06:18,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27222 states, 17063 states have (on average 1.3077418976733282) internal successors, (22314), 17560 states have internal predecessors, (22314), 6658 states have call successors, (6658), 3427 states have call predecessors, (6658), 3500 states have return successors, (6896), 6543 states have call predecessors, (6896), 6628 states have call successors, (6896) [2021-11-23 02:06:18,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27222 states to 27222 states and 35868 transitions. [2021-11-23 02:06:18,750 INFO L78 Accepts]: Start accepts. Automaton has 27222 states and 35868 transitions. Word has length 252 [2021-11-23 02:06:18,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:18,750 INFO L470 AbstractCegarLoop]: Abstraction has 27222 states and 35868 transitions. [2021-11-23 02:06:18,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 6 states have internal predecessors, (90), 4 states have call successors, (35), 3 states have call predecessors, (35), 4 states have return successors, (33), 5 states have call predecessors, (33), 4 states have call successors, (33) [2021-11-23 02:06:18,751 INFO L276 IsEmpty]: Start isEmpty. Operand 27222 states and 35868 transitions. [2021-11-23 02:06:18,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-23 02:06:18,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:18,770 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:18,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:18,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:18,995 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:18,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:18,996 INFO L85 PathProgramCache]: Analyzing trace with hash 173812111, now seen corresponding path program 1 times [2021-11-23 02:06:18,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:18,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059680653] [2021-11-23 02:06:18,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:18,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:19,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:19,200 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 577 trivial. 0 not checked. [2021-11-23 02:06:19,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:19,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059680653] [2021-11-23 02:06:19,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059680653] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:19,201 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:19,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:06:19,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192555133] [2021-11-23 02:06:19,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:19,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:19,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:19,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:19,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:19,205 INFO L87 Difference]: Start difference. First operand 27222 states and 35868 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (39), 3 states have call predecessors, (39), 1 states have return successors, (37), 2 states have call predecessors, (37), 2 states have call successors, (37) [2021-11-23 02:06:22,015 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:25,922 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:26,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:26,016 INFO L93 Difference]: Finished difference Result 49123 states and 64301 transitions. [2021-11-23 02:06:26,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:26,017 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (39), 3 states have call predecessors, (39), 1 states have return successors, (37), 2 states have call predecessors, (37), 2 states have call successors, (37) Word has length 282 [2021-11-23 02:06:26,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:26,079 INFO L225 Difference]: With dead ends: 49123 [2021-11-23 02:06:26,079 INFO L226 Difference]: Without dead ends: 24618 [2021-11-23 02:06:26,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:26,289 INFO L933 BasicCegarLoop]: 1949 mSDtfsCounter, 1424 mSDsluCounter, 1210 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 403 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1491 SdHoareTripleChecker+Valid, 3032 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:26,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1491 Valid, 3032 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 503 Invalid, 2 Unknown, 0 Unchecked, 6.0s Time] [2021-11-23 02:06:26,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24618 states. [2021-11-23 02:06:27,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24618 to 24405. [2021-11-23 02:06:27,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24405 states, 15275 states have (on average 1.3014075286415712) internal successors, (19879), 15704 states have internal predecessors, (19879), 5820 states have call successors, (5820), 3233 states have call predecessors, (5820), 3309 states have return successors, (6048), 5742 states have call predecessors, (6048), 5801 states have call successors, (6048) [2021-11-23 02:06:27,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24405 states to 24405 states and 31747 transitions. [2021-11-23 02:06:27,152 INFO L78 Accepts]: Start accepts. Automaton has 24405 states and 31747 transitions. Word has length 282 [2021-11-23 02:06:27,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:27,153 INFO L470 AbstractCegarLoop]: Abstraction has 24405 states and 31747 transitions. [2021-11-23 02:06:27,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (39), 3 states have call predecessors, (39), 1 states have return successors, (37), 2 states have call predecessors, (37), 2 states have call successors, (37) [2021-11-23 02:06:27,154 INFO L276 IsEmpty]: Start isEmpty. Operand 24405 states and 31747 transitions. [2021-11-23 02:06:27,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-23 02:06:27,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:27,170 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:27,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:06:27,171 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:27,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:27,172 INFO L85 PathProgramCache]: Analyzing trace with hash -542239805, now seen corresponding path program 1 times [2021-11-23 02:06:27,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:27,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119806055] [2021-11-23 02:06:27,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:27,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:27,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:27,397 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2021-11-23 02:06:27,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:27,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119806055] [2021-11-23 02:06:27,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119806055] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:27,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405658893] [2021-11-23 02:06:27,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:27,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:27,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:27,399 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:27,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:06:28,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:28,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 2897 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:06:28,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:28,745 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 586 trivial. 0 not checked. [2021-11-23 02:06:28,745 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:06:28,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405658893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:28,746 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:06:28,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 7 [2021-11-23 02:06:28,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185124248] [2021-11-23 02:06:28,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:28,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:28,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:28,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:28,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:06:28,749 INFO L87 Difference]: Start difference. First operand 24405 states and 31747 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 1 states have call predecessors, (36), 1 states have call successors, (36) [2021-11-23 02:06:30,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:35,254 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:35,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:35,531 INFO L93 Difference]: Finished difference Result 49397 states and 65256 transitions. [2021-11-23 02:06:35,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:06:35,531 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 1 states have call predecessors, (36), 1 states have call successors, (36) Word has length 284 [2021-11-23 02:06:35,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:35,593 INFO L225 Difference]: With dead ends: 49397 [2021-11-23 02:06:35,593 INFO L226 Difference]: Without dead ends: 27668 [2021-11-23 02:06:35,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:06:35,631 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 1128 mSDsluCounter, 1781 mSDsCounter, 0 mSdLazyCounter, 1072 mSolverCounterSat, 76 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1151 SdHoareTripleChecker+Valid, 3124 SdHoareTripleChecker+Invalid, 1150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 1072 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:35,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1151 Valid, 3124 Invalid, 1150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 1072 Invalid, 2 Unknown, 0 Unchecked, 5.9s Time] [2021-11-23 02:06:35,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27668 states. [2021-11-23 02:06:36,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27668 to 24435. [2021-11-23 02:06:36,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24435 states, 15316 states have (on average 1.3014494646121704) internal successors, (19933), 15765 states have internal predecessors, (19933), 5844 states have call successors, (5844), 3190 states have call predecessors, (5844), 3274 states have return successors, (6072), 5762 states have call predecessors, (6072), 5825 states have call successors, (6072) [2021-11-23 02:06:36,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24435 states to 24435 states and 31849 transitions. [2021-11-23 02:06:36,685 INFO L78 Accepts]: Start accepts. Automaton has 24435 states and 31849 transitions. Word has length 284 [2021-11-23 02:06:36,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:36,685 INFO L470 AbstractCegarLoop]: Abstraction has 24435 states and 31849 transitions. [2021-11-23 02:06:36,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 1 states have call predecessors, (36), 1 states have call successors, (36) [2021-11-23 02:06:36,686 INFO L276 IsEmpty]: Start isEmpty. Operand 24435 states and 31849 transitions. [2021-11-23 02:06:36,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-23 02:06:36,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:36,703 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:36,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:36,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:36,918 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:36,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:36,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1837158580, now seen corresponding path program 1 times [2021-11-23 02:06:36,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:36,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187044586] [2021-11-23 02:06:36,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:36,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:37,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:37,178 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:06:37,179 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:37,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187044586] [2021-11-23 02:06:37,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187044586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:37,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670492823] [2021-11-23 02:06:37,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:37,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:37,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:37,181 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:37,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:06:38,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:38,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 3033 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:06:38,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:38,499 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 239 proven. 2 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2021-11-23 02:06:38,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:39,166 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2021-11-23 02:06:39,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670492823] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:39,166 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:06:39,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 11 [2021-11-23 02:06:39,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859312610] [2021-11-23 02:06:39,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:39,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:39,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:39,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:39,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:06:39,168 INFO L87 Difference]: Start difference. First operand 24435 states and 31849 transitions. Second operand has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 6 states have internal predecessors, (103), 3 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) [2021-11-23 02:06:41,186 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:46,582 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:46,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:46,808 INFO L93 Difference]: Finished difference Result 64160 states and 85699 transitions. [2021-11-23 02:06:46,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:46,810 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 6 states have internal predecessors, (103), 3 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) Word has length 291 [2021-11-23 02:06:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:46,895 INFO L225 Difference]: With dead ends: 64160 [2021-11-23 02:06:46,895 INFO L226 Difference]: Without dead ends: 39860 [2021-11-23 02:06:46,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:06:46,934 INFO L933 BasicCegarLoop]: 1568 mSDtfsCounter, 2580 mSDsluCounter, 2183 mSDsCounter, 0 mSdLazyCounter, 1566 mSolverCounterSat, 999 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2763 SdHoareTripleChecker+Valid, 3460 SdHoareTripleChecker+Invalid, 2567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 999 IncrementalHoareTripleChecker+Valid, 1566 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:46,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2763 Valid, 3460 Invalid, 2567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [999 Valid, 1566 Invalid, 2 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 02:06:46,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39860 states. [2021-11-23 02:06:48,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39860 to 32463. [2021-11-23 02:06:48,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32463 states, 20476 states have (on average 1.3060168001562806) internal successors, (26742), 21082 states have internal predecessors, (26742), 7588 states have call successors, (7588), 4293 states have call predecessors, (7588), 4398 states have return successors, (7876), 7478 states have call predecessors, (7876), 7569 states have call successors, (7876) [2021-11-23 02:06:48,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32463 states to 32463 states and 42206 transitions. [2021-11-23 02:06:48,280 INFO L78 Accepts]: Start accepts. Automaton has 32463 states and 42206 transitions. Word has length 291 [2021-11-23 02:06:48,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:48,281 INFO L470 AbstractCegarLoop]: Abstraction has 32463 states and 42206 transitions. [2021-11-23 02:06:48,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 6 states have internal predecessors, (103), 3 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 3 states have call predecessors, (39), 3 states have call successors, (39) [2021-11-23 02:06:48,281 INFO L276 IsEmpty]: Start isEmpty. Operand 32463 states and 42206 transitions. [2021-11-23 02:06:48,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2021-11-23 02:06:48,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:48,312 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:48,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:06:48,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:48,527 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:48,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:48,528 INFO L85 PathProgramCache]: Analyzing trace with hash -57237437, now seen corresponding path program 1 times [2021-11-23 02:06:48,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:48,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950577376] [2021-11-23 02:06:48,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:48,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:48,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:49,100 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2021-11-23 02:06:49,100 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:49,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950577376] [2021-11-23 02:06:49,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950577376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:49,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993625545] [2021-11-23 02:06:49,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:49,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:49,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:49,102 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:49,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:06:49,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:49,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 3215 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:06:49,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:50,499 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 239 proven. 2 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-11-23 02:06:50,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:51,301 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 603 trivial. 0 not checked. [2021-11-23 02:06:51,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993625545] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:51,301 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:06:51,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 8] total 20 [2021-11-23 02:06:51,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681963258] [2021-11-23 02:06:51,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:51,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:06:51,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:51,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:06:51,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:06:51,304 INFO L87 Difference]: Start difference. First operand 32463 states and 42206 transitions. Second operand has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 8 states have internal predecessors, (112), 4 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (41), 5 states have call predecessors, (41), 4 states have call successors, (41) [2021-11-23 02:06:53,160 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:06:56,079 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:05,933 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:06,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:06,171 INFO L93 Difference]: Finished difference Result 76787 states and 101956 transitions. [2021-11-23 02:07:06,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:07:06,171 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 8 states have internal predecessors, (112), 4 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (41), 5 states have call predecessors, (41), 4 states have call successors, (41) Word has length 310 [2021-11-23 02:07:06,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:06,432 INFO L225 Difference]: With dead ends: 76787 [2021-11-23 02:07:06,432 INFO L226 Difference]: Without dead ends: 44459 [2021-11-23 02:07:06,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 610 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:07:06,497 INFO L933 BasicCegarLoop]: 1546 mSDtfsCounter, 2233 mSDsluCounter, 5134 mSDsCounter, 0 mSdLazyCounter, 4305 mSolverCounterSat, 731 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2396 SdHoareTripleChecker+Valid, 5999 SdHoareTripleChecker+Invalid, 5038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 731 IncrementalHoareTripleChecker+Valid, 4305 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:06,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2396 Valid, 5999 Invalid, 5038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [731 Valid, 4305 Invalid, 2 Unknown, 0 Unchecked, 12.9s Time] [2021-11-23 02:07:06,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44459 states. [2021-11-23 02:07:08,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44459 to 37759. [2021-11-23 02:07:08,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37759 states, 23953 states have (on average 1.311401494593579) internal successors, (31412), 24646 states have internal predecessors, (31412), 8710 states have call successors, (8710), 4959 states have call predecessors, (8710), 5095 states have return successors, (9061), 8620 states have call predecessors, (9061), 8691 states have call successors, (9061) [2021-11-23 02:07:08,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37759 states to 37759 states and 49183 transitions. [2021-11-23 02:07:08,546 INFO L78 Accepts]: Start accepts. Automaton has 37759 states and 49183 transitions. Word has length 310 [2021-11-23 02:07:08,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:08,547 INFO L470 AbstractCegarLoop]: Abstraction has 37759 states and 49183 transitions. [2021-11-23 02:07:08,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 8 states have internal predecessors, (112), 4 states have call successors, (43), 2 states have call predecessors, (43), 2 states have return successors, (41), 5 states have call predecessors, (41), 4 states have call successors, (41) [2021-11-23 02:07:08,547 INFO L276 IsEmpty]: Start isEmpty. Operand 37759 states and 49183 transitions. [2021-11-23 02:07:08,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2021-11-23 02:07:08,585 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:08,585 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:08,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:08,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 02:07:08,786 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:08,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:08,787 INFO L85 PathProgramCache]: Analyzing trace with hash -912510772, now seen corresponding path program 1 times [2021-11-23 02:07:08,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:08,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753674515] [2021-11-23 02:07:08,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:08,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:08,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:09,115 INFO L134 CoverageAnalysis]: Checked inductivity of 645 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 614 trivial. 0 not checked. [2021-11-23 02:07:09,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:09,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753674515] [2021-11-23 02:07:09,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753674515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:09,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:09,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:07:09,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350494432] [2021-11-23 02:07:09,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:09,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:07:09,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:09,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:07:09,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:09,118 INFO L87 Difference]: Start difference. First operand 37759 states and 49183 transitions. Second operand has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 3 states have call successors, (46), 2 states have call predecessors, (46), 1 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:07:11,152 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:16,888 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:17,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:17,041 INFO L93 Difference]: Finished difference Result 80823 states and 105911 transitions. [2021-11-23 02:07:17,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:07:17,042 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 3 states have call successors, (46), 2 states have call predecessors, (46), 1 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) Word has length 333 [2021-11-23 02:07:17,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:17,174 INFO L225 Difference]: With dead ends: 80823 [2021-11-23 02:07:17,174 INFO L226 Difference]: Without dead ends: 47180 [2021-11-23 02:07:17,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:07:17,248 INFO L933 BasicCegarLoop]: 1639 mSDtfsCounter, 1116 mSDsluCounter, 2109 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 12 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1197 SdHoareTripleChecker+Valid, 3527 SdHoareTripleChecker+Invalid, 996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:17,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1197 Valid, 3527 Invalid, 996 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 982 Invalid, 2 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 02:07:17,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47180 states. [2021-11-23 02:07:19,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47180 to 44161. [2021-11-23 02:07:19,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44161 states, 28131 states have (on average 1.3120045501404145) internal successors, (36908), 28961 states have internal predecessors, (36908), 10083 states have call successors, (10083), 5772 states have call predecessors, (10083), 5946 states have return successors, (10490), 9990 states have call predecessors, (10490), 10064 states have call successors, (10490) [2021-11-23 02:07:19,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44161 states to 44161 states and 57481 transitions. [2021-11-23 02:07:19,653 INFO L78 Accepts]: Start accepts. Automaton has 44161 states and 57481 transitions. Word has length 333 [2021-11-23 02:07:19,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:19,654 INFO L470 AbstractCegarLoop]: Abstraction has 44161 states and 57481 transitions. [2021-11-23 02:07:19,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 3 states have call successors, (46), 2 states have call predecessors, (46), 1 states have return successors, (44), 3 states have call predecessors, (44), 3 states have call successors, (44) [2021-11-23 02:07:19,655 INFO L276 IsEmpty]: Start isEmpty. Operand 44161 states and 57481 transitions. [2021-11-23 02:07:19,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-23 02:07:19,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:19,935 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:19,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:07:19,935 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:19,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:19,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1369049969, now seen corresponding path program 1 times [2021-11-23 02:07:19,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:19,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110454707] [2021-11-23 02:07:19,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:19,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:20,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:20,302 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 622 trivial. 0 not checked. [2021-11-23 02:07:20,303 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:20,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110454707] [2021-11-23 02:07:20,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110454707] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:20,303 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:20,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 02:07:20,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139244181] [2021-11-23 02:07:20,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:20,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:07:20,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:20,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:07:20,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:07:20,306 INFO L87 Difference]: Start difference. First operand 44161 states and 57481 transitions. Second operand has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 6 states have internal predecessors, (129), 4 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 5 states have call predecessors, (46), 4 states have call successors, (46) [2021-11-23 02:07:22,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:28,455 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:30,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:30,047 INFO L93 Difference]: Finished difference Result 95879 states and 125462 transitions. [2021-11-23 02:07:30,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:07:30,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 6 states have internal predecessors, (129), 4 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 5 states have call predecessors, (46), 4 states have call successors, (46) Word has length 350 [2021-11-23 02:07:30,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:30,380 INFO L225 Difference]: With dead ends: 95879 [2021-11-23 02:07:30,380 INFO L226 Difference]: Without dead ends: 56224 [2021-11-23 02:07:30,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:07:30,457 INFO L933 BasicCegarLoop]: 1615 mSDtfsCounter, 1217 mSDsluCounter, 5773 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 60 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1298 SdHoareTripleChecker+Valid, 6806 SdHoareTripleChecker+Invalid, 2213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:30,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1298 Valid, 6806 Invalid, 2213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 2151 Invalid, 2 Unknown, 0 Unchecked, 7.2s Time] [2021-11-23 02:07:30,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56224 states. [2021-11-23 02:07:32,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56224 to 40497. [2021-11-23 02:07:32,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40497 states, 25697 states have (on average 1.3099583608981593) internal successors, (33662), 26435 states have internal predecessors, (33662), 9323 states have call successors, (9323), 5322 states have call predecessors, (9323), 5476 states have return successors, (9690), 9246 states have call predecessors, (9690), 9304 states have call successors, (9690) [2021-11-23 02:07:32,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40497 states to 40497 states and 52675 transitions. [2021-11-23 02:07:32,997 INFO L78 Accepts]: Start accepts. Automaton has 40497 states and 52675 transitions. Word has length 350 [2021-11-23 02:07:32,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:32,999 INFO L470 AbstractCegarLoop]: Abstraction has 40497 states and 52675 transitions. [2021-11-23 02:07:32,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 6 states have internal predecessors, (129), 4 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 5 states have call predecessors, (46), 4 states have call successors, (46) [2021-11-23 02:07:32,999 INFO L276 IsEmpty]: Start isEmpty. Operand 40497 states and 52675 transitions. [2021-11-23 02:07:33,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2021-11-23 02:07:33,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:33,062 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:33,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:07:33,062 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:33,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:33,063 INFO L85 PathProgramCache]: Analyzing trace with hash 2038601703, now seen corresponding path program 1 times [2021-11-23 02:07:33,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:33,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891410315] [2021-11-23 02:07:33,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:33,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:33,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:34,018 INFO L134 CoverageAnalysis]: Checked inductivity of 809 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 773 trivial. 0 not checked. [2021-11-23 02:07:34,018 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:34,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891410315] [2021-11-23 02:07:34,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891410315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:07:34,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490703130] [2021-11-23 02:07:34,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:34,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:34,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:34,020 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:34,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:07:37,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:37,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 4030 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-23 02:07:37,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:37,798 INFO L134 CoverageAnalysis]: Checked inductivity of 809 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2021-11-23 02:07:37,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:07:37,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490703130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:37,799 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:07:37,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 7 [2021-11-23 02:07:37,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815523498] [2021-11-23 02:07:37,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:37,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:07:37,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:07:37,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:07:37,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:07:37,801 INFO L87 Difference]: Start difference. First operand 40497 states and 52675 transitions. Second operand has 7 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 4 states have call predecessors, (55), 2 states have call successors, (55) [2021-11-23 02:07:39,255 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:40,809 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:42,863 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:44,904 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:46,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:51,169 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:07:52,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:52,421 INFO L93 Difference]: Finished difference Result 81026 states and 105510 transitions. [2021-11-23 02:07:52,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:07:52,422 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 4 states have call predecessors, (55), 2 states have call successors, (55) Word has length 395 [2021-11-23 02:07:52,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:52,552 INFO L225 Difference]: With dead ends: 81026 [2021-11-23 02:07:52,552 INFO L226 Difference]: Without dead ends: 40664 [2021-11-23 02:07:52,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:07:52,634 INFO L933 BasicCegarLoop]: 1076 mSDtfsCounter, 3 mSDsluCounter, 5942 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6437 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:52,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6437 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 735 Invalid, 4 Unknown, 0 Unchecked, 12.9s Time] [2021-11-23 02:07:52,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40664 states. [2021-11-23 02:07:54,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40664 to 40595. [2021-11-23 02:07:54,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40595 states, 25769 states have (on average 1.3090923202297333) internal successors, (33734), 26497 states have internal predecessors, (33734), 9323 states have call successors, (9323), 5322 states have call predecessors, (9323), 5502 states have return successors, (9794), 9282 states have call predecessors, (9794), 9304 states have call successors, (9794) [2021-11-23 02:07:54,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40595 states to 40595 states and 52851 transitions. [2021-11-23 02:07:54,756 INFO L78 Accepts]: Start accepts. Automaton has 40595 states and 52851 transitions. Word has length 395 [2021-11-23 02:07:54,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:54,757 INFO L470 AbstractCegarLoop]: Abstraction has 40595 states and 52851 transitions. [2021-11-23 02:07:54,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 4 states have call predecessors, (55), 2 states have call successors, (55) [2021-11-23 02:07:54,758 INFO L276 IsEmpty]: Start isEmpty. Operand 40595 states and 52851 transitions. [2021-11-23 02:07:54,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2021-11-23 02:07:54,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:54,805 INFO L514 BasicCegarLoop]: trace histogram [16, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:54,855 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-23 02:07:55,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:55,027 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:07:55,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:55,028 INFO L85 PathProgramCache]: Analyzing trace with hash 2036244149, now seen corresponding path program 1 times [2021-11-23 02:07:55,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:07:55,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141523784] [2021-11-23 02:07:55,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:55,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:07:55,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:55,578 INFO L134 CoverageAnalysis]: Checked inductivity of 989 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 959 trivial. 0 not checked. [2021-11-23 02:07:55,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:07:55,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141523784] [2021-11-23 02:07:55,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141523784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:07:55,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553676943] [2021-11-23 02:07:55,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:55,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:55,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:55,583 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:55,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:08:04,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:04,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 4156 conjuncts, 163 conjunts are in the unsatisfiable core [2021-11-23 02:08:04,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:04,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:08:05,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2021-11-23 02:08:05,484 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-23 02:08:05,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-23 02:08:05,770 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-23 02:08:05,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 22 [2021-11-23 02:08:05,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 02:08:07,894 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_wdm_create_~desc~13#1.base_BEFORE_CALL_8| Int) (|v_wdm_create_~desc~13#1.offset_BEFORE_CALL_1| Int)) (and (not (= |v_wdm_create_~desc~13#1.base_BEFORE_CALL_8| (select (select |c_#memory_$Pointer$.base| |v_wdm_create_~desc~13#1.base_BEFORE_CALL_8|) (+ |v_wdm_create_~desc~13#1.offset_BEFORE_CALL_1| 72)))) (not (= |v_wdm_create_~desc~13#1.base_BEFORE_CALL_8| 0)))) is different from true [2021-11-23 02:08:20,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:08:20,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:08:20,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-23 02:08:20,660 INFO L134 CoverageAnalysis]: Checked inductivity of 989 backedges. 280 proven. 30 refuted. 0 times theorem prover too weak. 675 trivial. 4 not checked. [2021-11-23 02:08:20,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:08:24,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Some non-self update cases but no top-level DER relation [2021-11-23 02:08:24,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456046637] [2021-11-23 02:08:24,245 INFO L159 IcfgInterpreter]: Started Sifa with 198 locations of interest [2021-11-23 02:08:24,246 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:08:24,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:08:24,260 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:08:24,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:08:26,278 FATAL L? ?]: Ignoring exception! java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@f75661a at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker.assertLhs(IncrementalPlicationChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker.checkPlication(IncrementalPlicationChecker.java:135) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.ArrayIndexEqualityManager.(ArrayIndexEqualityManager.java:92) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.ElimStorePlain.applyComplexEliminationRules(ElimStorePlain.java:388) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:140) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminateOne(DualJunctionSaa.java:115) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryExhaustivelyToEliminate(DualJunctionSaa.java:93) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:88) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToEliminateOne(QuantifierPusher.java:903) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyNewEliminationTechniquesExhaustively(QuantifierPusher.java:865) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyDualJunctionEliminationTechniques(QuantifierPusher.java:783) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyEliminationToAtom(QuantifierPusher.java:311) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:145) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine$ApplicationTermTask.doStep(TermContextTransformationEngine.java:169) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:77) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:243) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:233) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.newQuantifier(SymbolicTools.java:285) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.projectExistentially(SymbolicTools.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermDomainOperationProvider.projectExistentially(TermDomainOperationProvider.java:1) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateTransformer.strongestPostcondition(PredicateTransformer.java:131) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:119) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-23 02:08:26,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:08:26,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-23 02:08:26,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693953425] [2021-11-23 02:08:26,282 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 02:08:26,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:08:26,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:08:26,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:08:26,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=4, NotChecked=56, Total=930 [2021-11-23 02:08:26,285 INFO L87 Difference]: Start difference. First operand 40595 states and 52851 transitions. Second operand has 7 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (56), 4 states have call predecessors, (56), 2 states have call successors, (56) [2021-11-23 02:08:26,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:08:26,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 463 SyntacticMatches, 12 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=83, Invalid=787, Unknown=4, NotChecked=56, Total=930 [2021-11-23 02:08:26,293 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:26,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:08:26,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:08:26,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 02:08:26,519 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@f75661a at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.chooseFalseSuccessor2(BasicAbstractInterpolantAutomaton.java:107) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:73) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-23 02:08:26,521 INFO L158 Benchmark]: Toolchain (without parser) took 280624.92ms. Allocated memory was 138.4MB in the beginning and 8.2GB in the end (delta: 8.1GB). Free memory was 96.3MB in the beginning and 5.8GB in the end (delta: -5.7GB). Peak memory consumption was 2.4GB. Max. memory is 16.1GB. [2021-11-23 02:08:26,522 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 92.3MB. Free memory was 64.3MB in the beginning and 64.3MB in the end (delta: 31.3kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:08:26,522 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2585.03ms. Allocated memory is still 138.4MB. Free memory was 96.3MB in the beginning and 88.0MB in the end (delta: 8.2MB). Peak memory consumption was 64.9MB. Max. memory is 16.1GB. [2021-11-23 02:08:26,522 INFO L158 Benchmark]: Boogie Procedure Inliner took 227.60ms. Allocated memory is still 138.4MB. Free memory was 88.0MB in the beginning and 72.6MB in the end (delta: 15.4MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-23 02:08:26,522 INFO L158 Benchmark]: Boogie Preprocessor took 232.61ms. Allocated memory is still 138.4MB. Free memory was 72.6MB in the beginning and 55.9MB in the end (delta: 16.8MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2021-11-23 02:08:26,523 INFO L158 Benchmark]: RCFGBuilder took 5548.38ms. Allocated memory was 138.4MB in the beginning and 352.3MB in the end (delta: 213.9MB). Free memory was 55.9MB in the beginning and 234.6MB in the end (delta: -178.8MB). Peak memory consumption was 153.0MB. Max. memory is 16.1GB. [2021-11-23 02:08:26,523 INFO L158 Benchmark]: TraceAbstraction took 272023.41ms. Allocated memory was 352.3MB in the beginning and 8.2GB in the end (delta: 7.9GB). Free memory was 233.6MB in the beginning and 5.8GB in the end (delta: -5.6GB). Peak memory consumption was 2.3GB. Max. memory is 16.1GB. [2021-11-23 02:08:26,525 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 92.3MB. Free memory was 64.3MB in the beginning and 64.3MB in the end (delta: 31.3kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2585.03ms. Allocated memory is still 138.4MB. Free memory was 96.3MB in the beginning and 88.0MB in the end (delta: 8.2MB). Peak memory consumption was 64.9MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 227.60ms. Allocated memory is still 138.4MB. Free memory was 88.0MB in the beginning and 72.6MB in the end (delta: 15.4MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * Boogie Preprocessor took 232.61ms. Allocated memory is still 138.4MB. Free memory was 72.6MB in the beginning and 55.9MB in the end (delta: 16.8MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * RCFGBuilder took 5548.38ms. Allocated memory was 138.4MB in the beginning and 352.3MB in the end (delta: 213.9MB). Free memory was 55.9MB in the beginning and 234.6MB in the end (delta: -178.8MB). Peak memory consumption was 153.0MB. Max. memory is 16.1GB. * TraceAbstraction took 272023.41ms. Allocated memory was 352.3MB in the beginning and 8.2GB in the end (delta: 7.9GB). Free memory was 233.6MB in the beginning and 5.8GB in the end (delta: -5.6GB). Peak memory consumption was 2.3GB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@f75661a de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.smtlibutils.IncrementalPlicationChecker@f75661a: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 02:08:26,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V --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 64bit --witnessprinter.graph.data.programhash 4de76b02991c4f8780142b48e1370b1ba073d7148b74e77b2c83d6f21359d59e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:08:29,392 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:08:29,394 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:08:29,427 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:08:29,427 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:08:29,429 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:08:29,431 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:08:29,433 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:08:29,436 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:08:29,437 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:08:29,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:08:29,439 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:08:29,440 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:08:29,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:08:29,443 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:08:29,444 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:08:29,446 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:08:29,447 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:08:29,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:08:29,451 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:08:29,453 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:08:29,455 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:08:29,456 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:08:29,457 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:08:29,461 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:08:29,462 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:08:29,462 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:08:29,464 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:08:29,464 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:08:29,465 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:08:29,466 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:08:29,467 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:08:29,468 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:08:29,469 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:08:29,470 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:08:29,471 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:08:29,472 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:08:29,472 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:08:29,473 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:08:29,474 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:08:29,475 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:08:29,476 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-23 02:08:29,505 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:08:29,505 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:08:29,506 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:08:29,506 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:08:29,507 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:08:29,507 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:08:29,508 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:08:29,508 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:08:29,509 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:08:29,509 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:08:29,509 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:08:29,510 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:08:29,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:08:29,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:08:29,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:08:29,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:08:29,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:08:29,513 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:08:29,513 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 02:08:29,514 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 02:08:29,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:08:29,514 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:08:29,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:08:29,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:08:29,515 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 02:08:29,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:08:29,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:08:29,516 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:08:29,516 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:08:29,516 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:08:29,516 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 02:08:29,517 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 02:08:29,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:08:29,517 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:08:29,517 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:08:29,517 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_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4de76b02991c4f8780142b48e1370b1ba073d7148b74e77b2c83d6f21359d59e [2021-11-23 02:08:29,918 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:08:29,948 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:08:29,951 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:08:29,953 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:08:29,953 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:08:29,955 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:08:30,031 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/5934202a1/4fae3c98a84248ef8cb7ecada7e4e8d2/FLAG3aafb8a8c [2021-11-23 02:08:31,089 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:08:31,090 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:08:31,135 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/5934202a1/4fae3c98a84248ef8cb7ecada7e4e8d2/FLAG3aafb8a8c [2021-11-23 02:08:31,478 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/data/5934202a1/4fae3c98a84248ef8cb7ecada7e4e8d2 [2021-11-23 02:08:31,480 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:08:31,481 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:08:31,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:08:31,483 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:08:31,493 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:08:31,495 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:08:31" (1/1) ... [2021-11-23 02:08:31,497 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3895d67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:31, skipping insertion in model container [2021-11-23 02:08:31,497 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:08:31" (1/1) ... [2021-11-23 02:08:31,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:08:31,651 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:08:33,403 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i[185536,185549] [2021-11-23 02:08:33,670 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:33,737 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 02:08:33,835 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:08:34,130 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i[185536,185549] [2021-11-23 02:08:34,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:34,217 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:08:34,494 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/sv-benchmarks/c/ldv-linux-4.2-rc1/linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i[185536,185549] [2021-11-23 02:08:34,516 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:08:34,645 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:08:34,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34 WrapperNode [2021-11-23 02:08:34,646 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:08:34,647 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:08:34,647 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:08:34,647 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:08:34,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:34,739 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:34,878 INFO L137 Inliner]: procedures = 296, calls = 1375, calls flagged for inlining = 101, calls inlined = 84, statements flattened = 2482 [2021-11-23 02:08:34,879 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:08:34,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:08:34,880 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:08:34,880 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:08:34,889 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:34,889 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:34,908 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:34,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:35,023 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:35,056 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:35,086 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:35,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:08:35,116 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:08:35,117 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:08:35,117 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:08:35,118 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (1/1) ... [2021-11-23 02:08:35,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:08:35,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:35,161 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:08:35,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:08:35,218 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-23 02:08:35,218 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2021-11-23 02:08:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2021-11-23 02:08:35,219 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-23 02:08:35,219 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 02:08:35,219 INFO L130 BoogieDeclarations]: Found specification of procedure usb_translate_errors [2021-11-23 02:08:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_translate_errors [2021-11-23 02:08:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-23 02:08:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-23 02:08:35,220 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-23 02:08:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-23 02:08:35,221 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-23 02:08:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_wdm_mutex [2021-11-23 02:08:35,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_wdm_mutex [2021-11-23 02:08:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure recover_from_urb_loss [2021-11-23 02:08:35,221 INFO L138 BoogieDeclarations]: Found implementation of procedure recover_from_urb_loss [2021-11-23 02:08:35,222 INFO L130 BoogieDeclarations]: Found specification of procedure usb_fill_control_urb [2021-11-23 02:08:35,222 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_fill_control_urb [2021-11-23 02:08:35,222 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-23 02:08:35,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-23 02:08:35,222 INFO L130 BoogieDeclarations]: Found specification of procedure activate_work_1 [2021-11-23 02:08:35,223 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_work_1 [2021-11-23 02:08:35,223 INFO L130 BoogieDeclarations]: Found specification of procedure __might_sleep [2021-11-23 02:08:35,223 INFO L138 BoogieDeclarations]: Found implementation of procedure __might_sleep [2021-11-23 02:08:35,223 INFO L130 BoogieDeclarations]: Found specification of procedure usb_autopm_get_interface [2021-11-23 02:08:35,223 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_autopm_get_interface [2021-11-23 02:08:35,224 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_create [2021-11-23 02:08:35,224 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_create [2021-11-23 02:08:35,224 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-23 02:08:35,224 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-23 02:08:35,224 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-23 02:08:35,225 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-23 02:08:35,225 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_poll [2021-11-23 02:08:35,225 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_poll [2021-11-23 02:08:35,226 INFO L130 BoogieDeclarations]: Found specification of procedure clear_bit [2021-11-23 02:08:35,226 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_bit [2021-11-23 02:08:35,226 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:08:35,226 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:08:35,226 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-23 02:08:35,227 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-23 02:08:35,227 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2021-11-23 02:08:35,227 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2021-11-23 02:08:35,227 INFO L130 BoogieDeclarations]: Found specification of procedure clear_wdm_read_flag [2021-11-23 02:08:35,228 INFO L138 BoogieDeclarations]: Found implementation of procedure clear_wdm_read_flag [2021-11-23 02:08:35,228 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_cancel_work_sync_39 [2021-11-23 02:08:35,228 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_cancel_work_sync_39 [2021-11-23 02:08:35,229 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_write [2021-11-23 02:08:35,229 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_write [2021-11-23 02:08:35,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:08:35,231 INFO L130 BoogieDeclarations]: Found specification of procedure INIT_LIST_HEAD [2021-11-23 02:08:35,231 INFO L138 BoogieDeclarations]: Found implementation of procedure INIT_LIST_HEAD [2021-11-23 02:08:35,231 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_ioctl [2021-11-23 02:08:35,232 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_ioctl [2021-11-23 02:08:35,233 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_disconnect [2021-11-23 02:08:35,233 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_disconnect [2021-11-23 02:08:35,233 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:08:35,233 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_rlock_of_wdm_device [2021-11-23 02:08:35,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_rlock_of_wdm_device [2021-11-23 02:08:35,234 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-11-23 02:08:35,235 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-11-23 02:08:35,235 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock_interruptible [2021-11-23 02:08:35,235 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock_interruptible [2021-11-23 02:08:35,235 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-23 02:08:35,236 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_rxwork [2021-11-23 02:08:35,236 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_rxwork [2021-11-23 02:08:35,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-23 02:08:35,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-23 02:08:35,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:08:35,237 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 02:08:35,238 INFO L130 BoogieDeclarations]: Found specification of procedure disable_work_1 [2021-11-23 02:08:35,238 INFO L138 BoogieDeclarations]: Found implementation of procedure disable_work_1 [2021-11-23 02:08:35,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 02:08:35,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 02:08:35,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-23 02:08:35,239 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-23 02:08:35,239 INFO L130 BoogieDeclarations]: Found specification of procedure cancel_work_sync [2021-11-23 02:08:35,239 INFO L138 BoogieDeclarations]: Found implementation of procedure cancel_work_sync [2021-11-23 02:08:35,239 INFO L130 BoogieDeclarations]: Found specification of procedure __might_fault [2021-11-23 02:08:35,239 INFO L138 BoogieDeclarations]: Found implementation of procedure __might_fault [2021-11-23 02:08:35,240 INFO L130 BoogieDeclarations]: Found specification of procedure list_del [2021-11-23 02:08:35,240 INFO L138 BoogieDeclarations]: Found implementation of procedure list_del [2021-11-23 02:08:35,240 INFO L130 BoogieDeclarations]: Found specification of procedure __mutex_init [2021-11-23 02:08:35,241 INFO L138 BoogieDeclarations]: Found implementation of procedure __mutex_init [2021-11-23 02:08:35,241 INFO L130 BoogieDeclarations]: Found specification of procedure queue_work_on [2021-11-23 02:08:35,241 INFO L138 BoogieDeclarations]: Found implementation of procedure queue_work_on [2021-11-23 02:08:35,242 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2021-11-23 02:08:35,242 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2021-11-23 02:08:35,242 INFO L130 BoogieDeclarations]: Found specification of procedure _raw_spin_lock_irqsave [2021-11-23 02:08:35,243 INFO L138 BoogieDeclarations]: Found implementation of procedure _raw_spin_lock_irqsave [2021-11-23 02:08:35,243 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_wdm_mutex [2021-11-23 02:08:35,244 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_wdm_mutex [2021-11-23 02:08:35,244 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_wlock_of_wdm_device [2021-11-23 02:08:35,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_wlock_of_wdm_device [2021-11-23 02:08:35,245 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~X~C_INT~TO~C_INT [2021-11-23 02:08:35,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~X~C_INT~TO~C_INT [2021-11-23 02:08:35,245 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock [2021-11-23 02:08:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock [2021-11-23 02:08:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure schedule [2021-11-23 02:08:35,246 INFO L138 BoogieDeclarations]: Found implementation of procedure schedule [2021-11-23 02:08:35,246 INFO L130 BoogieDeclarations]: Found specification of procedure usb_alloc_urb [2021-11-23 02:08:35,247 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_alloc_urb [2021-11-23 02:08:35,247 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_flush [2021-11-23 02:08:35,247 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_flush [2021-11-23 02:08:35,247 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_wlock_of_wdm_device [2021-11-23 02:08:35,248 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_wlock_of_wdm_device [2021-11-23 02:08:35,248 INFO L130 BoogieDeclarations]: Found specification of procedure usb_autopm_put_interface [2021-11-23 02:08:35,248 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_autopm_put_interface [2021-11-23 02:08:35,248 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-23 02:08:35,249 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-23 02:08:35,249 INFO L130 BoogieDeclarations]: Found specification of procedure constant_test_bit [2021-11-23 02:08:35,250 INFO L138 BoogieDeclarations]: Found implementation of procedure constant_test_bit [2021-11-23 02:08:35,253 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2021-11-23 02:08:35,253 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2021-11-23 02:08:35,253 INFO L130 BoogieDeclarations]: Found specification of procedure kill_urbs [2021-11-23 02:08:35,253 INFO L138 BoogieDeclarations]: Found implementation of procedure kill_urbs [2021-11-23 02:08:35,254 INFO L130 BoogieDeclarations]: Found specification of procedure prepare_to_wait_event [2021-11-23 02:08:35,256 INFO L138 BoogieDeclarations]: Found implementation of procedure prepare_to_wait_event [2021-11-23 02:08:35,256 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-23 02:08:35,256 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-23 02:08:35,257 INFO L130 BoogieDeclarations]: Found specification of procedure copy_to_user [2021-11-23 02:08:35,264 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_to_user [2021-11-23 02:08:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-23 02:08:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-23 02:08:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-23 02:08:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irq [2021-11-23 02:08:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irq [2021-11-23 02:08:35,265 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-23 02:08:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-23 02:08:35,265 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-23 02:08:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-23 02:08:35,265 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_resume [2021-11-23 02:08:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_resume [2021-11-23 02:08:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:08:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure test_and_set_bit [2021-11-23 02:08:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure test_and_set_bit [2021-11-23 02:08:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-23 02:08:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-23 02:08:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:08:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2021-11-23 02:08:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2021-11-23 02:08:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:08:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure spin_lock_irq [2021-11-23 02:08:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_lock_irq [2021-11-23 02:08:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure __wake_up [2021-11-23 02:08:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure __wake_up [2021-11-23 02:08:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2021-11-23 02:08:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2021-11-23 02:08:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 02:08:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 02:08:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_rlock_of_wdm_device [2021-11-23 02:08:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_rlock_of_wdm_device [2021-11-23 02:08:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure schedule_work [2021-11-23 02:08:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure schedule_work [2021-11-23 02:08:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure wdm_find_device [2021-11-23 02:08:35,270 INFO L138 BoogieDeclarations]: Found implementation of procedure wdm_find_device [2021-11-23 02:08:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure spin_lock [2021-11-23 02:08:35,270 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_lock [2021-11-23 02:08:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure set_bit [2021-11-23 02:08:35,270 INFO L138 BoogieDeclarations]: Found implementation of procedure set_bit [2021-11-23 02:08:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure interface_to_usbdev [2021-11-23 02:08:35,271 INFO L138 BoogieDeclarations]: Found implementation of procedure interface_to_usbdev [2021-11-23 02:08:35,271 INFO L130 BoogieDeclarations]: Found specification of procedure finish_wait [2021-11-23 02:08:35,271 INFO L138 BoogieDeclarations]: Found implementation of procedure finish_wait [2021-11-23 02:08:35,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:08:35,271 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:08:35,905 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:08:35,909 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:08:38,700 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-23 02:08:55,251 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:08:55,274 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:08:55,274 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:08:55,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:08:55 BoogieIcfgContainer [2021-11-23 02:08:55,279 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:08:55,281 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:08:55,281 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:08:55,284 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:08:55,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:08:31" (1/3) ... [2021-11-23 02:08:55,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c524044 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:08:55, skipping insertion in model container [2021-11-23 02:08:55,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:08:34" (2/3) ... [2021-11-23 02:08:55,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c524044 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:08:55, skipping insertion in model container [2021-11-23 02:08:55,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:08:55" (3/3) ... [2021-11-23 02:08:55,287 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-4.2-rc1.tar.xz-32_7a-drivers--usb--class--cdc-wdm.ko-entry_point.cil.out.i [2021-11-23 02:08:55,293 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:08:55,293 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:08:55,360 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:08:55,367 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:08:55,368 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:08:55,427 INFO L276 IsEmpty]: Start isEmpty. Operand has 1061 states, 688 states have (on average 1.305232558139535) internal successors, (898), 721 states have internal predecessors, (898), 301 states have call successors, (301), 71 states have call predecessors, (301), 70 states have return successors, (296), 295 states have call predecessors, (296), 296 states have call successors, (296) [2021-11-23 02:08:55,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 02:08:55,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:55,461 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:55,461 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:55,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:55,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1798257421, now seen corresponding path program 1 times [2021-11-23 02:08:55,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:08:55,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1793251942] [2021-11-23 02:08:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:55,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:08:55,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:08:55,503 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:08:55,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 02:08:56,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:08:56,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 1296 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 02:08:56,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:57,731 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2021-11-23 02:08:57,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:08:58,428 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2021-11-23 02:08:58,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:08:58,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1793251942] [2021-11-23 02:08:58,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1793251942] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:08:58,438 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:08:58,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2021-11-23 02:08:58,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623761788] [2021-11-23 02:08:58,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:08:58,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:08:58,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:08:58,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:08:58,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:08:58,498 INFO L87 Difference]: Start difference. First operand has 1061 states, 688 states have (on average 1.305232558139535) internal successors, (898), 721 states have internal predecessors, (898), 301 states have call successors, (301), 71 states have call predecessors, (301), 70 states have return successors, (296), 295 states have call predecessors, (296), 296 states have call successors, (296) Second operand has 2 states, 2 states have (on average 27.5) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-23 02:08:58,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:08:58,706 INFO L93 Difference]: Finished difference Result 2117 states and 3035 transitions. [2021-11-23 02:08:58,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:08:58,708 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 27.5) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 192 [2021-11-23 02:08:58,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:08:58,758 INFO L225 Difference]: With dead ends: 2117 [2021-11-23 02:08:58,758 INFO L226 Difference]: Without dead ends: 1049 [2021-11-23 02:08:58,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:08:58,781 INFO L933 BasicCegarLoop]: 1478 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1478 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:08:58,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1478 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:08:58,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1049 states. [2021-11-23 02:08:58,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1049 to 1049. [2021-11-23 02:08:58,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1049 states, 683 states have (on average 1.2957540263543192) internal successors, (885), 709 states have internal predecessors, (885), 296 states have call successors, (296), 70 states have call predecessors, (296), 69 states have return successors, (282), 281 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-23 02:08:58,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1049 states to 1049 states and 1463 transitions. [2021-11-23 02:08:58,964 INFO L78 Accepts]: Start accepts. Automaton has 1049 states and 1463 transitions. Word has length 192 [2021-11-23 02:08:58,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:08:58,965 INFO L470 AbstractCegarLoop]: Abstraction has 1049 states and 1463 transitions. [2021-11-23 02:08:58,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 27.5) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-23 02:08:58,969 INFO L276 IsEmpty]: Start isEmpty. Operand 1049 states and 1463 transitions. [2021-11-23 02:08:58,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 02:08:58,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:08:58,982 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:08:59,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:08:59,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:08:59,191 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:08:59,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:08:59,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1229300763, now seen corresponding path program 1 times [2021-11-23 02:08:59,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:08:59,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1503510117] [2021-11-23 02:08:59,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:08:59,196 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:08:59,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:08:59,200 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:08:59,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 02:09:00,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:00,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 1296 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:09:00,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:01,239 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2021-11-23 02:09:01,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:02,020 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-11-23 02:09:02,020 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:02,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1503510117] [2021-11-23 02:09:02,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1503510117] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:02,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:09:02,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 02:09:02,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486143061] [2021-11-23 02:09:02,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:02,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:09:02,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:02,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:09:02,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:09:02,025 INFO L87 Difference]: Start difference. First operand 1049 states and 1463 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-23 02:09:02,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:02,342 INFO L93 Difference]: Finished difference Result 2084 states and 2913 transitions. [2021-11-23 02:09:02,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:09:02,343 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 192 [2021-11-23 02:09:02,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:02,359 INFO L225 Difference]: With dead ends: 2084 [2021-11-23 02:09:02,359 INFO L226 Difference]: Without dead ends: 1050 [2021-11-23 02:09:02,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:09:02,366 INFO L933 BasicCegarLoop]: 1461 mSDtfsCounter, 3 mSDsluCounter, 2903 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 4364 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:02,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 4364 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:02,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1050 states. [2021-11-23 02:09:02,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1050 to 1050. [2021-11-23 02:09:02,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1050 states, 684 states have (on average 1.2953216374269005) internal successors, (886), 710 states have internal predecessors, (886), 296 states have call successors, (296), 70 states have call predecessors, (296), 69 states have return successors, (282), 281 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-23 02:09:02,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1050 states to 1050 states and 1464 transitions. [2021-11-23 02:09:02,459 INFO L78 Accepts]: Start accepts. Automaton has 1050 states and 1464 transitions. Word has length 192 [2021-11-23 02:09:02,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:02,461 INFO L470 AbstractCegarLoop]: Abstraction has 1050 states and 1464 transitions. [2021-11-23 02:09:02,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-23 02:09:02,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1050 states and 1464 transitions. [2021-11-23 02:09:02,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-23 02:09:02,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:02,466 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:02,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 02:09:02,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:02,671 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:02,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:02,672 INFO L85 PathProgramCache]: Analyzing trace with hash -560347083, now seen corresponding path program 1 times [2021-11-23 02:09:02,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:02,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1025207468] [2021-11-23 02:09:02,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:02,675 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:02,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:02,682 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:02,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 02:09:03,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:03,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:03,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:04,806 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:04,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:05,820 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:05,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:05,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1025207468] [2021-11-23 02:09:05,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1025207468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:05,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1732297580] [2021-11-23 02:09:05,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:05,822 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:05,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:05,824 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:05,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-23 02:09:06,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:06,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:06,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:08,636 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:08,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:09,441 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:09,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1732297580] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:09,441 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:09,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:09,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585048264] [2021-11-23 02:09:09,442 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:09,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:09,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:09,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:09,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:09,444 INFO L87 Difference]: Start difference. First operand 1050 states and 1464 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:09,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:09,515 INFO L93 Difference]: Finished difference Result 1052 states and 1465 transitions. [2021-11-23 02:09:09,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:09,515 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 201 [2021-11-23 02:09:09,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:09,528 INFO L225 Difference]: With dead ends: 1052 [2021-11-23 02:09:09,529 INFO L226 Difference]: Without dead ends: 1049 [2021-11-23 02:09:09,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 800 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:09,535 INFO L933 BasicCegarLoop]: 1460 mSDtfsCounter, 1381 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1381 SdHoareTripleChecker+Valid, 1460 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:09,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1381 Valid, 1460 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:09,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1049 states. [2021-11-23 02:09:09,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1049 to 1049. [2021-11-23 02:09:09,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1049 states, 684 states have (on average 1.293859649122807) internal successors, (885), 709 states have internal predecessors, (885), 295 states have call successors, (295), 70 states have call predecessors, (295), 69 states have return successors, (282), 281 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-23 02:09:09,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1049 states to 1049 states and 1462 transitions. [2021-11-23 02:09:09,613 INFO L78 Accepts]: Start accepts. Automaton has 1049 states and 1462 transitions. Word has length 201 [2021-11-23 02:09:09,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:09,618 INFO L470 AbstractCegarLoop]: Abstraction has 1049 states and 1462 transitions. [2021-11-23 02:09:09,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:09,618 INFO L276 IsEmpty]: Start isEmpty. Operand 1049 states and 1462 transitions. [2021-11-23 02:09:09,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-23 02:09:09,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:09,622 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:09,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-23 02:09:09,855 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-23 02:09:10,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:10,029 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:10,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:10,030 INFO L85 PathProgramCache]: Analyzing trace with hash -191383574, now seen corresponding path program 1 times [2021-11-23 02:09:10,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:10,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1875428784] [2021-11-23 02:09:10,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:10,032 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:10,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:10,034 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:10,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 02:09:11,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:11,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 1342 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:11,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:11,970 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:11,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:12,812 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:12,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1875428784] [2021-11-23 02:09:12,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1875428784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:12,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1857694393] [2021-11-23 02:09:12,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:12,813 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:12,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:12,815 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:12,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 02:09:13,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:13,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 1342 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:13,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:15,110 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:15,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:15,793 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:15,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1857694393] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:15,794 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:15,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:15,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157621491] [2021-11-23 02:09:15,795 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:15,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:15,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:15,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:15,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:15,797 INFO L87 Difference]: Start difference. First operand 1049 states and 1462 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:15,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:15,867 INFO L93 Difference]: Finished difference Result 1051 states and 1463 transitions. [2021-11-23 02:09:15,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:15,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 202 [2021-11-23 02:09:15,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:15,876 INFO L225 Difference]: With dead ends: 1051 [2021-11-23 02:09:15,876 INFO L226 Difference]: Without dead ends: 1048 [2021-11-23 02:09:15,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 797 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:15,878 INFO L933 BasicCegarLoop]: 1458 mSDtfsCounter, 1378 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1378 SdHoareTripleChecker+Valid, 1458 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:15,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1378 Valid, 1458 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:15,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2021-11-23 02:09:15,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 1048. [2021-11-23 02:09:15,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1048 states, 684 states have (on average 1.2923976608187135) internal successors, (884), 708 states have internal predecessors, (884), 294 states have call successors, (294), 70 states have call predecessors, (294), 69 states have return successors, (282), 281 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-23 02:09:15,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1048 states to 1048 states and 1460 transitions. [2021-11-23 02:09:15,944 INFO L78 Accepts]: Start accepts. Automaton has 1048 states and 1460 transitions. Word has length 202 [2021-11-23 02:09:15,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:15,945 INFO L470 AbstractCegarLoop]: Abstraction has 1048 states and 1460 transitions. [2021-11-23 02:09:15,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:15,945 INFO L276 IsEmpty]: Start isEmpty. Operand 1048 states and 1460 transitions. [2021-11-23 02:09:15,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-11-23 02:09:15,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:15,949 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:15,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:16,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:16,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:16,367 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:16,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:16,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1638411816, now seen corresponding path program 1 times [2021-11-23 02:09:16,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:16,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [426584071] [2021-11-23 02:09:16,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:16,369 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:16,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:16,395 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:16,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 02:09:17,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:17,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 1343 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:17,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:18,178 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:18,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:18,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:18,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [426584071] [2021-11-23 02:09:18,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [426584071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:18,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1688376309] [2021-11-23 02:09:18,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:18,983 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:18,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:18,984 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:19,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 02:09:19,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:19,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1343 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:19,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:21,324 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:21,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:22,076 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:22,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1688376309] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:22,077 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:22,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:22,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367893402] [2021-11-23 02:09:22,078 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:22,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:22,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:22,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:22,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:22,080 INFO L87 Difference]: Start difference. First operand 1048 states and 1460 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:22,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:22,156 INFO L93 Difference]: Finished difference Result 1050 states and 1461 transitions. [2021-11-23 02:09:22,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:22,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 203 [2021-11-23 02:09:22,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:22,165 INFO L225 Difference]: With dead ends: 1050 [2021-11-23 02:09:22,166 INFO L226 Difference]: Without dead ends: 1047 [2021-11-23 02:09:22,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 801 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:22,167 INFO L933 BasicCegarLoop]: 1456 mSDtfsCounter, 1375 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1375 SdHoareTripleChecker+Valid, 1456 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:22,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1375 Valid, 1456 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:22,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1047 states. [2021-11-23 02:09:22,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1047 to 1047. [2021-11-23 02:09:22,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1047 states, 684 states have (on average 1.29093567251462) internal successors, (883), 707 states have internal predecessors, (883), 293 states have call successors, (293), 70 states have call predecessors, (293), 69 states have return successors, (282), 281 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-23 02:09:22,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1047 states to 1047 states and 1458 transitions. [2021-11-23 02:09:22,233 INFO L78 Accepts]: Start accepts. Automaton has 1047 states and 1458 transitions. Word has length 203 [2021-11-23 02:09:22,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:22,235 INFO L470 AbstractCegarLoop]: Abstraction has 1047 states and 1458 transitions. [2021-11-23 02:09:22,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:22,235 INFO L276 IsEmpty]: Start isEmpty. Operand 1047 states and 1458 transitions. [2021-11-23 02:09:22,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-23 02:09:22,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:22,239 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:22,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:22,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:22,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:22,646 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:22,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:22,647 INFO L85 PathProgramCache]: Analyzing trace with hash -1120165552, now seen corresponding path program 1 times [2021-11-23 02:09:22,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:22,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195707303] [2021-11-23 02:09:22,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:22,648 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:22,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:22,650 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:22,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 02:09:23,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:23,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:23,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:24,435 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:24,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:25,258 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:25,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:25,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195707303] [2021-11-23 02:09:25,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195707303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:25,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1003195381] [2021-11-23 02:09:25,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:25,259 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:25,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:25,261 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:25,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 02:09:25,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:25,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:25,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:26,328 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:26,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:26,712 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:26,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1003195381] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:26,713 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:26,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:26,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405024515] [2021-11-23 02:09:26,714 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:26,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:26,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:26,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:26,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:26,716 INFO L87 Difference]: Start difference. First operand 1047 states and 1458 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-23 02:09:27,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:27,200 INFO L93 Difference]: Finished difference Result 2609 states and 3589 transitions. [2021-11-23 02:09:27,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:27,201 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 204 [2021-11-23 02:09:27,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:27,214 INFO L225 Difference]: With dead ends: 2609 [2021-11-23 02:09:27,214 INFO L226 Difference]: Without dead ends: 1604 [2021-11-23 02:09:27,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 805 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:27,220 INFO L933 BasicCegarLoop]: 1598 mSDtfsCounter, 780 mSDsluCounter, 1361 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 780 SdHoareTripleChecker+Valid, 2959 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:27,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [780 Valid, 2959 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:09:27,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1604 states. [2021-11-23 02:09:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1604 to 1583. [2021-11-23 02:09:27,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1583 states, 1039 states have (on average 1.2810394610202118) internal successors, (1331), 1065 states have internal predecessors, (1331), 423 states have call successors, (423), 121 states have call predecessors, (423), 120 states have return successors, (412), 410 states have call predecessors, (412), 412 states have call successors, (412) [2021-11-23 02:09:27,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1583 states to 1583 states and 2166 transitions. [2021-11-23 02:09:27,325 INFO L78 Accepts]: Start accepts. Automaton has 1583 states and 2166 transitions. Word has length 204 [2021-11-23 02:09:27,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:27,326 INFO L470 AbstractCegarLoop]: Abstraction has 1583 states and 2166 transitions. [2021-11-23 02:09:27,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2021-11-23 02:09:27,327 INFO L276 IsEmpty]: Start isEmpty. Operand 1583 states and 2166 transitions. [2021-11-23 02:09:27,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-23 02:09:27,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:27,330 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:27,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:27,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:27,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:27,736 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:27,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:27,737 INFO L85 PathProgramCache]: Analyzing trace with hash 748357805, now seen corresponding path program 1 times [2021-11-23 02:09:27,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:27,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [574831182] [2021-11-23 02:09:27,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:27,738 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:27,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:27,739 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:27,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 02:09:28,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:28,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 1344 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:28,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:29,443 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:29,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:30,222 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:30,222 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:30,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [574831182] [2021-11-23 02:09:30,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [574831182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:30,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1011456601] [2021-11-23 02:09:30,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:30,223 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:30,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:30,224 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:30,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 02:09:30,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:30,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 1344 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:30,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:32,558 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:32,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:33,194 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:33,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1011456601] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:33,194 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:33,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:33,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674790157] [2021-11-23 02:09:33,195 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:33,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:33,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:33,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:33,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:33,197 INFO L87 Difference]: Start difference. First operand 1583 states and 2166 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:33,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:33,444 INFO L93 Difference]: Finished difference Result 4547 states and 6220 transitions. [2021-11-23 02:09:33,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:33,445 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 204 [2021-11-23 02:09:33,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:33,468 INFO L225 Difference]: With dead ends: 4547 [2021-11-23 02:09:33,468 INFO L226 Difference]: Without dead ends: 3006 [2021-11-23 02:09:33,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 805 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:33,477 INFO L933 BasicCegarLoop]: 1966 mSDtfsCounter, 1331 mSDsluCounter, 1342 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1331 SdHoareTripleChecker+Valid, 3308 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:33,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1331 Valid, 3308 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:33,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3006 states. [2021-11-23 02:09:33,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3006 to 2994. [2021-11-23 02:09:33,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2994 states, 1988 states have (on average 1.2862173038229376) internal successors, (2557), 2034 states have internal predecessors, (2557), 774 states have call successors, (774), 237 states have call predecessors, (774), 231 states have return successors, (761), 748 states have call predecessors, (761), 761 states have call successors, (761) [2021-11-23 02:09:33,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2994 states to 2994 states and 4092 transitions. [2021-11-23 02:09:33,701 INFO L78 Accepts]: Start accepts. Automaton has 2994 states and 4092 transitions. Word has length 204 [2021-11-23 02:09:33,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:33,702 INFO L470 AbstractCegarLoop]: Abstraction has 2994 states and 4092 transitions. [2021-11-23 02:09:33,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:33,703 INFO L276 IsEmpty]: Start isEmpty. Operand 2994 states and 4092 transitions. [2021-11-23 02:09:33,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-23 02:09:33,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:33,706 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:33,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:33,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:34,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:34,112 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:34,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:34,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1723776891, now seen corresponding path program 1 times [2021-11-23 02:09:34,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:34,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2137719084] [2021-11-23 02:09:34,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:34,114 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:34,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:34,116 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:34,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 02:09:35,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:35,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:35,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:35,874 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:35,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:36,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2137719084] [2021-11-23 02:09:36,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2137719084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:36,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [500064577] [2021-11-23 02:09:36,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:36,721 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:36,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:36,738 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:36,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 02:09:37,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:37,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:37,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:38,941 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:38,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:39,605 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:39,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [500064577] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:39,605 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:39,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:39,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101021102] [2021-11-23 02:09:39,606 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:39,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:39,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:39,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:39,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:39,607 INFO L87 Difference]: Start difference. First operand 2994 states and 4092 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:39,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:39,857 INFO L93 Difference]: Finished difference Result 3373 states and 4453 transitions. [2021-11-23 02:09:39,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:39,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 205 [2021-11-23 02:09:39,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:39,888 INFO L225 Difference]: With dead ends: 3373 [2021-11-23 02:09:39,888 INFO L226 Difference]: Without dead ends: 3369 [2021-11-23 02:09:39,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 809 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:39,892 INFO L933 BasicCegarLoop]: 1467 mSDtfsCounter, 1174 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1174 SdHoareTripleChecker+Valid, 1796 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:39,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1174 Valid, 1796 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:39,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3369 states. [2021-11-23 02:09:40,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3369 to 3363. [2021-11-23 02:09:40,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3363 states, 2244 states have (on average 1.2633689839572193) internal successors, (2835), 2286 states have internal predecessors, (2835), 808 states have call successors, (808), 318 states have call predecessors, (808), 310 states have return successors, (797), 784 states have call predecessors, (797), 797 states have call successors, (797) [2021-11-23 02:09:40,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3363 states to 3363 states and 4440 transitions. [2021-11-23 02:09:40,129 INFO L78 Accepts]: Start accepts. Automaton has 3363 states and 4440 transitions. Word has length 205 [2021-11-23 02:09:40,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:40,129 INFO L470 AbstractCegarLoop]: Abstraction has 3363 states and 4440 transitions. [2021-11-23 02:09:40,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:40,130 INFO L276 IsEmpty]: Start isEmpty. Operand 3363 states and 4440 transitions. [2021-11-23 02:09:40,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-23 02:09:40,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:40,134 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:40,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:40,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:40,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:40,547 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:40,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:40,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1897002352, now seen corresponding path program 1 times [2021-11-23 02:09:40,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:40,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1849510201] [2021-11-23 02:09:40,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:40,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:40,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:40,550 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:40,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 02:09:41,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:41,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 1346 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:41,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:42,229 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:42,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:42,986 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:42,986 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:42,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1849510201] [2021-11-23 02:09:42,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1849510201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:42,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [994866599] [2021-11-23 02:09:42,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:42,987 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:42,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:42,987 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:42,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 02:09:43,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:43,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 1346 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:43,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:45,218 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:45,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:45,879 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:45,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [994866599] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:45,880 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:45,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:45,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912981612] [2021-11-23 02:09:45,881 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:45,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:45,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:45,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:45,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:45,883 INFO L87 Difference]: Start difference. First operand 3363 states and 4440 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:46,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:46,243 INFO L93 Difference]: Finished difference Result 9513 states and 12619 transitions. [2021-11-23 02:09:46,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:46,243 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) Word has length 206 [2021-11-23 02:09:46,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:46,290 INFO L225 Difference]: With dead ends: 9513 [2021-11-23 02:09:46,290 INFO L226 Difference]: Without dead ends: 6182 [2021-11-23 02:09:46,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 813 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:46,308 INFO L933 BasicCegarLoop]: 1706 mSDtfsCounter, 1321 mSDsluCounter, 1269 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1321 SdHoareTripleChecker+Valid, 2975 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:46,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1321 Valid, 2975 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:46,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6182 states. [2021-11-23 02:09:46,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6182 to 6141. [2021-11-23 02:09:46,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6141 states, 4124 states have (on average 1.270611057225994) internal successors, (5240), 4204 states have internal predecessors, (5240), 1459 states have call successors, (1459), 579 states have call predecessors, (1459), 557 states have return successors, (1453), 1402 states have call predecessors, (1453), 1445 states have call successors, (1453) [2021-11-23 02:09:46,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6141 states to 6141 states and 8152 transitions. [2021-11-23 02:09:46,800 INFO L78 Accepts]: Start accepts. Automaton has 6141 states and 8152 transitions. Word has length 206 [2021-11-23 02:09:46,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:46,801 INFO L470 AbstractCegarLoop]: Abstraction has 6141 states and 8152 transitions. [2021-11-23 02:09:46,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 2 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-23 02:09:46,802 INFO L276 IsEmpty]: Start isEmpty. Operand 6141 states and 8152 transitions. [2021-11-23 02:09:46,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 02:09:46,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:46,808 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:46,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:47,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:47,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:47,223 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:47,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:47,224 INFO L85 PathProgramCache]: Analyzing trace with hash -507754846, now seen corresponding path program 1 times [2021-11-23 02:09:47,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:47,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [234854750] [2021-11-23 02:09:47,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:47,225 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:47,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:47,226 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:47,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 02:09:48,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:48,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 1479 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:48,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:49,147 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-23 02:09:49,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:50,011 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2021-11-23 02:09:50,011 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:50,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [234854750] [2021-11-23 02:09:50,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [234854750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:50,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1668067548] [2021-11-23 02:09:50,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:50,011 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:50,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:50,012 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:50,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 02:09:50,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:50,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 1479 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:50,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:51,250 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:51,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:51,748 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2021-11-23 02:09:51,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1668067548] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:51,748 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:51,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:51,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049844774] [2021-11-23 02:09:51,749 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:51,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:51,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:51,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:51,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:51,750 INFO L87 Difference]: Start difference. First operand 6141 states and 8152 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:09:52,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:52,439 INFO L93 Difference]: Finished difference Result 15235 states and 20268 transitions. [2021-11-23 02:09:52,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:09:52,440 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 249 [2021-11-23 02:09:52,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:52,522 INFO L225 Difference]: With dead ends: 15235 [2021-11-23 02:09:52,522 INFO L226 Difference]: Without dead ends: 9136 [2021-11-23 02:09:52,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 985 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:52,552 INFO L933 BasicCegarLoop]: 2156 mSDtfsCounter, 994 mSDsluCounter, 1372 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 994 SdHoareTripleChecker+Valid, 3528 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:52,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [994 Valid, 3528 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:52,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9136 states. [2021-11-23 02:09:53,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9136 to 9072. [2021-11-23 02:09:53,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9072 states, 6131 states have (on average 1.2824987767085305) internal successors, (7863), 6275 states have internal predecessors, (7863), 2117 states have call successors, (2117), 847 states have call predecessors, (2117), 823 states have return successors, (2119), 2036 states have call predecessors, (2119), 2103 states have call successors, (2119) [2021-11-23 02:09:53,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9072 states to 9072 states and 12099 transitions. [2021-11-23 02:09:53,203 INFO L78 Accepts]: Start accepts. Automaton has 9072 states and 12099 transitions. Word has length 249 [2021-11-23 02:09:53,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:53,204 INFO L470 AbstractCegarLoop]: Abstraction has 9072 states and 12099 transitions. [2021-11-23 02:09:53,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:09:53,205 INFO L276 IsEmpty]: Start isEmpty. Operand 9072 states and 12099 transitions. [2021-11-23 02:09:53,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-23 02:09:53,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:53,292 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:53,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:53,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:53,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:53,701 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:53,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:53,702 INFO L85 PathProgramCache]: Analyzing trace with hash -839225501, now seen corresponding path program 1 times [2021-11-23 02:09:53,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:53,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1867044190] [2021-11-23 02:09:53,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:53,704 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:53,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:53,705 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:53,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 02:09:55,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:55,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:55,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:56,018 INFO L134 CoverageAnalysis]: Checked inductivity of 692 backedges. 162 proven. 1 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2021-11-23 02:09:56,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:56,948 INFO L134 CoverageAnalysis]: Checked inductivity of 692 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 635 trivial. 0 not checked. [2021-11-23 02:09:56,949 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:56,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1867044190] [2021-11-23 02:09:56,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1867044190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:56,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [35172150] [2021-11-23 02:09:56,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:56,949 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:56,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:56,960 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:56,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 02:09:57,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:57,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:09:57,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:58,198 INFO L134 CoverageAnalysis]: Checked inductivity of 692 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 689 trivial. 0 not checked. [2021-11-23 02:09:58,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:58,668 INFO L134 CoverageAnalysis]: Checked inductivity of 692 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 689 trivial. 0 not checked. [2021-11-23 02:09:58,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [35172150] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:58,668 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:09:58,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:09:58,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262444811] [2021-11-23 02:09:58,669 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:58,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:09:58,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:58,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:09:58,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:09:58,670 INFO L87 Difference]: Start difference. First operand 9072 states and 12099 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-23 02:10:00,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:01,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:01,346 INFO L93 Difference]: Finished difference Result 18113 states and 24155 transitions. [2021-11-23 02:10:01,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:10:01,347 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) Word has length 278 [2021-11-23 02:10:01,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:01,405 INFO L225 Difference]: With dead ends: 18113 [2021-11-23 02:10:01,405 INFO L226 Difference]: Without dead ends: 9095 [2021-11-23 02:10:01,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1108 GetRequests, 1101 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:10:01,450 INFO L933 BasicCegarLoop]: 1463 mSDtfsCounter, 12 mSDsluCounter, 1447 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 2910 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:01,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 2910 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:10:01,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9095 states. [2021-11-23 02:10:02,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9095 to 9051. [2021-11-23 02:10:02,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9051 states, 6110 states have (on average 1.2821603927986907) internal successors, (7834), 6258 states have internal predecessors, (7834), 2117 states have call successors, (2117), 847 states have call predecessors, (2117), 823 states have return successors, (2119), 2032 states have call predecessors, (2119), 2103 states have call successors, (2119) [2021-11-23 02:10:02,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9051 states to 9051 states and 12070 transitions. [2021-11-23 02:10:02,078 INFO L78 Accepts]: Start accepts. Automaton has 9051 states and 12070 transitions. Word has length 278 [2021-11-23 02:10:02,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:02,079 INFO L470 AbstractCegarLoop]: Abstraction has 9051 states and 12070 transitions. [2021-11-23 02:10:02,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-23 02:10:02,080 INFO L276 IsEmpty]: Start isEmpty. Operand 9051 states and 12070 transitions. [2021-11-23 02:10:02,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2021-11-23 02:10:02,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:02,089 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:02,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:02,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:02,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:02,501 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:02,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:02,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1184120907, now seen corresponding path program 1 times [2021-11-23 02:10:02,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:02,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [791959235] [2021-11-23 02:10:02,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:02,503 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:02,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:02,505 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:02,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 02:10:03,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:04,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 1606 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:04,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:05,086 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2021-11-23 02:10:05,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:06,172 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 873 trivial. 0 not checked. [2021-11-23 02:10:06,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:06,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [791959235] [2021-11-23 02:10:06,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [791959235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:06,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1217220572] [2021-11-23 02:10:06,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:06,173 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:06,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:06,174 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:06,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 02:10:06,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:06,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 1606 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:10:06,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:07,692 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 227 proven. 0 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2021-11-23 02:10:07,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:08,324 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 927 trivial. 0 not checked. [2021-11-23 02:10:08,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1217220572] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:08,325 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:08,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-23 02:10:08,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337227161] [2021-11-23 02:10:08,326 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:08,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:10:08,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:08,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:10:08,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:10:08,328 INFO L87 Difference]: Start difference. First operand 9051 states and 12070 transitions. Second operand has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 4 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (31), 4 states have call predecessors, (31), 4 states have call successors, (31) [2021-11-23 02:10:10,406 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:13,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:13,979 INFO L93 Difference]: Finished difference Result 25370 states and 33715 transitions. [2021-11-23 02:10:13,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:10:13,980 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 4 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (31), 4 states have call predecessors, (31), 4 states have call successors, (31) Word has length 286 [2021-11-23 02:10:13,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:14,122 INFO L225 Difference]: With dead ends: 25370 [2021-11-23 02:10:14,123 INFO L226 Difference]: Without dead ends: 16375 [2021-11-23 02:10:14,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1140 GetRequests, 1132 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:10:14,159 INFO L933 BasicCegarLoop]: 2252 mSDtfsCounter, 2287 mSDsluCounter, 1774 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 353 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2287 SdHoareTripleChecker+Valid, 4026 SdHoareTripleChecker+Invalid, 717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 353 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:14,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2287 Valid, 4026 Invalid, 717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [353 Valid, 363 Invalid, 1 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:10:14,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16375 states. [2021-11-23 02:10:15,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16375 to 16228. [2021-11-23 02:10:15,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16228 states, 11074 states have (on average 1.2805670940942748) internal successors, (14181), 11317 states have internal predecessors, (14181), 3605 states have call successors, (3605), 1593 states have call predecessors, (3605), 1548 states have return successors, (3607), 3458 states have call predecessors, (3607), 3591 states have call successors, (3607) [2021-11-23 02:10:15,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16228 states to 16228 states and 21393 transitions. [2021-11-23 02:10:15,168 INFO L78 Accepts]: Start accepts. Automaton has 16228 states and 21393 transitions. Word has length 286 [2021-11-23 02:10:15,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:15,169 INFO L470 AbstractCegarLoop]: Abstraction has 16228 states and 21393 transitions. [2021-11-23 02:10:15,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 4 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (31), 4 states have call predecessors, (31), 4 states have call successors, (31) [2021-11-23 02:10:15,170 INFO L276 IsEmpty]: Start isEmpty. Operand 16228 states and 21393 transitions. [2021-11-23 02:10:15,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-23 02:10:15,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:15,178 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:15,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:15,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:15,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:15,599 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:15,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:15,600 INFO L85 PathProgramCache]: Analyzing trace with hash -2129030613, now seen corresponding path program 1 times [2021-11-23 02:10:15,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:15,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [160128188] [2021-11-23 02:10:15,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:15,601 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:15,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:15,602 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:15,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 02:10:16,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:16,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:16,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:17,745 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2021-11-23 02:10:17,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:18,713 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 873 trivial. 0 not checked. [2021-11-23 02:10:18,714 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:18,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [160128188] [2021-11-23 02:10:18,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [160128188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:18,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1291263629] [2021-11-23 02:10:18,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:18,714 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:18,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:18,715 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:18,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 02:10:19,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:19,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:19,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:20,126 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:10:20,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:20,654 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:10:20,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1291263629] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:20,654 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:20,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:10:20,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380203319] [2021-11-23 02:10:20,655 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:20,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:10:20,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:20,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:10:20,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:10:20,656 INFO L87 Difference]: Start difference. First operand 16228 states and 21393 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:10:22,733 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:23,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:23,401 INFO L93 Difference]: Finished difference Result 16236 states and 21399 transitions. [2021-11-23 02:10:23,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:10:23,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) Word has length 295 [2021-11-23 02:10:23,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:23,466 INFO L225 Difference]: With dead ends: 16236 [2021-11-23 02:10:23,466 INFO L226 Difference]: Without dead ends: 16233 [2021-11-23 02:10:23,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 1169 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:10:23,475 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 304 mSDsluCounter, 1255 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 2792 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:23,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 2792 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:10:23,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16233 states. [2021-11-23 02:10:24,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16233 to 16227. [2021-11-23 02:10:24,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16227 states, 11074 states have (on average 1.2793028715911143) internal successors, (14167), 11316 states have internal predecessors, (14167), 3604 states have call successors, (3604), 1593 states have call predecessors, (3604), 1548 states have return successors, (3607), 3458 states have call predecessors, (3607), 3591 states have call successors, (3607) [2021-11-23 02:10:24,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16227 states to 16227 states and 21378 transitions. [2021-11-23 02:10:24,420 INFO L78 Accepts]: Start accepts. Automaton has 16227 states and 21378 transitions. Word has length 295 [2021-11-23 02:10:24,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:24,421 INFO L470 AbstractCegarLoop]: Abstraction has 16227 states and 21378 transitions. [2021-11-23 02:10:24,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 2 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 02:10:24,421 INFO L276 IsEmpty]: Start isEmpty. Operand 16227 states and 21378 transitions. [2021-11-23 02:10:24,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2021-11-23 02:10:24,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:24,427 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:24,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:24,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:24,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:24,834 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:24,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:24,834 INFO L85 PathProgramCache]: Analyzing trace with hash 501598896, now seen corresponding path program 1 times [2021-11-23 02:10:24,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:24,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1723325767] [2021-11-23 02:10:24,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:24,836 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:24,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:24,839 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:24,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 02:10:26,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:26,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 1660 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:26,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:27,294 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2021-11-23 02:10:27,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:28,337 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 873 trivial. 0 not checked. [2021-11-23 02:10:28,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:28,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1723325767] [2021-11-23 02:10:28,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1723325767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:28,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1439948598] [2021-11-23 02:10:28,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:28,338 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:28,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:28,339 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:28,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 02:10:29,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:29,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 1660 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:10:29,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:30,021 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 297 proven. 0 refuted. 0 times theorem prover too weak. 633 trivial. 0 not checked. [2021-11-23 02:10:30,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:30,691 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 927 trivial. 0 not checked. [2021-11-23 02:10:30,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1439948598] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:30,692 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:30,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-23 02:10:30,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917372688] [2021-11-23 02:10:30,692 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:30,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:10:30,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:30,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:10:30,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:10:30,694 INFO L87 Difference]: Start difference. First operand 16227 states and 21378 transitions. Second operand has 4 states, 4 states have (on average 36.25) internal successors, (145), 4 states have internal predecessors, (145), 4 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 4 states have call predecessors, (40), 4 states have call successors, (40) [2021-11-23 02:10:32,754 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:36,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:36,932 INFO L93 Difference]: Finished difference Result 44464 states and 58473 transitions. [2021-11-23 02:10:36,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:10:36,932 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 36.25) internal successors, (145), 4 states have internal predecessors, (145), 4 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 4 states have call predecessors, (40), 4 states have call successors, (40) Word has length 311 [2021-11-23 02:10:36,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:37,153 INFO L225 Difference]: With dead ends: 44464 [2021-11-23 02:10:37,154 INFO L226 Difference]: Without dead ends: 28293 [2021-11-23 02:10:37,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1240 GetRequests, 1232 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:10:37,191 INFO L933 BasicCegarLoop]: 2166 mSDtfsCounter, 2766 mSDsluCounter, 1834 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 369 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2766 SdHoareTripleChecker+Valid, 4000 SdHoareTripleChecker+Invalid, 865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 369 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:37,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2766 Valid, 4000 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [369 Valid, 495 Invalid, 1 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 02:10:37,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28293 states. [2021-11-23 02:10:38,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28293 to 28169. [2021-11-23 02:10:38,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28169 states, 19439 states have (on average 1.2842224394258963) internal successors, (24964), 19879 states have internal predecessors, (24964), 5955 states have call successors, (5955), 2849 states have call predecessors, (5955), 2774 states have return successors, (5974), 5721 states have call predecessors, (5974), 5942 states have call successors, (5974) [2021-11-23 02:10:38,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28169 states to 28169 states and 36893 transitions. [2021-11-23 02:10:38,660 INFO L78 Accepts]: Start accepts. Automaton has 28169 states and 36893 transitions. Word has length 311 [2021-11-23 02:10:38,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:38,661 INFO L470 AbstractCegarLoop]: Abstraction has 28169 states and 36893 transitions. [2021-11-23 02:10:38,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 36.25) internal successors, (145), 4 states have internal predecessors, (145), 4 states have call successors, (42), 3 states have call predecessors, (42), 3 states have return successors, (40), 4 states have call predecessors, (40), 4 states have call successors, (40) [2021-11-23 02:10:38,662 INFO L276 IsEmpty]: Start isEmpty. Operand 28169 states and 36893 transitions. [2021-11-23 02:10:38,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2021-11-23 02:10:38,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:38,671 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:38,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:38,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:39,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:39,087 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:39,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:39,088 INFO L85 PathProgramCache]: Analyzing trace with hash -2130663935, now seen corresponding path program 1 times [2021-11-23 02:10:39,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:39,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1641218668] [2021-11-23 02:10:39,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:39,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:39,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:39,092 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:39,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 02:10:40,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:40,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 1668 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:40,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:41,528 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2021-11-23 02:10:41,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:42,593 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-11-23 02:10:42,594 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:42,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1641218668] [2021-11-23 02:10:42,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1641218668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:42,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1124707167] [2021-11-23 02:10:42,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:42,594 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:42,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:42,595 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:42,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 02:10:43,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:43,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 1668 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:43,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:43,814 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:10:43,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:44,337 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 933 trivial. 0 not checked. [2021-11-23 02:10:44,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1124707167] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:44,339 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:44,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:10:44,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572643790] [2021-11-23 02:10:44,340 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:44,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:10:44,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:44,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:10:44,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:10:44,341 INFO L87 Difference]: Start difference. First operand 28169 states and 36893 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-23 02:10:46,408 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:10:47,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:47,685 INFO L93 Difference]: Finished difference Result 56296 states and 73745 transitions. [2021-11-23 02:10:47,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:10:47,686 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) Word has length 319 [2021-11-23 02:10:47,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:47,802 INFO L225 Difference]: With dead ends: 56296 [2021-11-23 02:10:47,803 INFO L226 Difference]: Without dead ends: 28183 [2021-11-23 02:10:47,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1272 GetRequests, 1265 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:10:47,866 INFO L933 BasicCegarLoop]: 2515 mSDtfsCounter, 1255 mSDsluCounter, 1394 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1255 SdHoareTripleChecker+Valid, 3909 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:47,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1255 Valid, 3909 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 8 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:10:47,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28183 states. [2021-11-23 02:10:49,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28183 to 28024. [2021-11-23 02:10:49,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28024 states, 19332 states have (on average 1.281657355679702) internal successors, (24777), 19796 states have internal predecessors, (24777), 5924 states have call successors, (5924), 2819 states have call predecessors, (5924), 2767 states have return successors, (5907), 5689 states have call predecessors, (5907), 5891 states have call successors, (5907) [2021-11-23 02:10:49,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28024 states to 28024 states and 36608 transitions. [2021-11-23 02:10:49,418 INFO L78 Accepts]: Start accepts. Automaton has 28024 states and 36608 transitions. Word has length 319 [2021-11-23 02:10:49,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:49,419 INFO L470 AbstractCegarLoop]: Abstraction has 28024 states and 36608 transitions. [2021-11-23 02:10:49,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (30), 2 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-23 02:10:49,419 INFO L276 IsEmpty]: Start isEmpty. Operand 28024 states and 36608 transitions. [2021-11-23 02:10:49,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-23 02:10:49,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:49,440 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:49,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:49,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:49,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:49,856 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:49,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:49,857 INFO L85 PathProgramCache]: Analyzing trace with hash -1853552757, now seen corresponding path program 1 times [2021-11-23 02:10:49,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:49,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1793826919] [2021-11-23 02:10:49,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:49,858 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:49,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:49,860 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:49,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 02:10:51,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:51,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 1731 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:51,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:52,350 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2021-11-23 02:10:52,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:53,676 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 873 trivial. 0 not checked. [2021-11-23 02:10:53,676 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:53,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1793826919] [2021-11-23 02:10:53,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1793826919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:53,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2062885818] [2021-11-23 02:10:53,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:53,676 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:53,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:53,677 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:53,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 02:10:54,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:54,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 1731 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:10:54,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:55,115 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:10:55,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:55,846 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:10:55,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2062885818] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:55,846 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:55,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 02:10:55,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062879217] [2021-11-23 02:10:55,847 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:55,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:10:55,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:55,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:10:55,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:10:55,848 INFO L87 Difference]: Start difference. First operand 28024 states and 36608 transitions. Second operand has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 states have internal predecessors, (110), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:10:57,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:57,400 INFO L93 Difference]: Finished difference Result 29505 states and 38348 transitions. [2021-11-23 02:10:57,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:10:57,401 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 states have internal predecessors, (110), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) Word has length 326 [2021-11-23 02:10:57,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:57,538 INFO L225 Difference]: With dead ends: 29505 [2021-11-23 02:10:57,538 INFO L226 Difference]: Without dead ends: 27868 [2021-11-23 02:10:57,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1302 GetRequests, 1288 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:10:57,561 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 42 mSDsluCounter, 8924 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 10431 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:57,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 10431 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:10:57,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27868 states. [2021-11-23 02:10:59,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27868 to 27116. [2021-11-23 02:10:59,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27116 states, 18801 states have (on average 1.280197861815861) internal successors, (24069), 19218 states have internal predecessors, (24069), 5584 states have call successors, (5584), 2766 states have call predecessors, (5584), 2730 states have return successors, (5585), 5396 states have call predecessors, (5585), 5553 states have call successors, (5585) [2021-11-23 02:10:59,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27116 states to 27116 states and 35238 transitions. [2021-11-23 02:10:59,253 INFO L78 Accepts]: Start accepts. Automaton has 27116 states and 35238 transitions. Word has length 326 [2021-11-23 02:10:59,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:59,254 INFO L470 AbstractCegarLoop]: Abstraction has 27116 states and 35238 transitions. [2021-11-23 02:10:59,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 states have internal predecessors, (110), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-23 02:10:59,254 INFO L276 IsEmpty]: Start isEmpty. Operand 27116 states and 35238 transitions. [2021-11-23 02:10:59,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2021-11-23 02:10:59,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:59,266 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:59,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-23 02:10:59,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 02:10:59,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:10:59,673 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:59,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:59,674 INFO L85 PathProgramCache]: Analyzing trace with hash 253422152, now seen corresponding path program 1 times [2021-11-23 02:10:59,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:59,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1261579477] [2021-11-23 02:10:59,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:59,676 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:59,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:59,677 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:59,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 02:11:00,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:00,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:11:00,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:02,124 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2021-11-23 02:11:02,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:03,314 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 883 trivial. 0 not checked. [2021-11-23 02:11:03,315 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:03,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1261579477] [2021-11-23 02:11:03,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1261579477] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:03,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [731351632] [2021-11-23 02:11:03,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:03,316 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:03,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:11:03,317 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:11:03,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 02:11:04,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:04,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:11:04,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:05,100 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:05,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:05,956 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:05,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [731351632] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:05,956 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:11:05,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 02:11:05,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121288035] [2021-11-23 02:11:05,957 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:05,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:11:05,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:05,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:11:05,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:11:05,959 INFO L87 Difference]: Start difference. First operand 27116 states and 35238 transitions. Second operand has 8 states, 8 states have (on average 16.5) internal successors, (132), 8 states have internal predecessors, (132), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) [2021-11-23 02:11:08,021 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:14,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:14,419 INFO L93 Difference]: Finished difference Result 70056 states and 91171 transitions. [2021-11-23 02:11:14,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:11:14,420 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 16.5) internal successors, (132), 8 states have internal predecessors, (132), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) Word has length 323 [2021-11-23 02:11:14,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:14,612 INFO L225 Difference]: With dead ends: 70056 [2021-11-23 02:11:14,612 INFO L226 Difference]: Without dead ends: 42996 [2021-11-23 02:11:14,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1294 GetRequests, 1277 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:11:14,699 INFO L933 BasicCegarLoop]: 2728 mSDtfsCounter, 3832 mSDsluCounter, 10286 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 735 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3834 SdHoareTripleChecker+Valid, 13014 SdHoareTripleChecker+Invalid, 1263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 735 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:14,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3834 Valid, 13014 Invalid, 1263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [735 Valid, 527 Invalid, 1 Unknown, 0 Unchecked, 5.8s Time] [2021-11-23 02:11:14,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42996 states. [2021-11-23 02:11:16,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42996 to 27164. [2021-11-23 02:11:16,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27164 states, 18849 states have (on average 1.279484322775744) internal successors, (24117), 19266 states have internal predecessors, (24117), 5584 states have call successors, (5584), 2766 states have call predecessors, (5584), 2730 states have return successors, (5585), 5396 states have call predecessors, (5585), 5553 states have call successors, (5585) [2021-11-23 02:11:16,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27164 states to 27164 states and 35286 transitions. [2021-11-23 02:11:16,299 INFO L78 Accepts]: Start accepts. Automaton has 27164 states and 35286 transitions. Word has length 323 [2021-11-23 02:11:16,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:16,300 INFO L470 AbstractCegarLoop]: Abstraction has 27164 states and 35286 transitions. [2021-11-23 02:11:16,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 16.5) internal successors, (132), 8 states have internal predecessors, (132), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) [2021-11-23 02:11:16,300 INFO L276 IsEmpty]: Start isEmpty. Operand 27164 states and 35286 transitions. [2021-11-23 02:11:16,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2021-11-23 02:11:16,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:16,316 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:16,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-23 02:11:16,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:16,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:16,739 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:16,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:16,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1846002428, now seen corresponding path program 1 times [2021-11-23 02:11:16,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:16,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1543101463] [2021-11-23 02:11:16,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:16,741 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:16,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:16,742 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:16,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 02:11:17,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:18,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 1751 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:11:18,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:19,324 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 579 trivial. 0 not checked. [2021-11-23 02:11:19,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 881 trivial. 0 not checked. [2021-11-23 02:11:20,417 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:20,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1543101463] [2021-11-23 02:11:20,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1543101463] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:20,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [78988627] [2021-11-23 02:11:20,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:20,418 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:20,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:11:20,419 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:11:20,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 02:11:21,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:21,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 1751 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:11:21,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:21,851 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:21,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:22,452 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:22,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [78988627] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:22,452 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:11:22,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-23 02:11:22,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551056555] [2021-11-23 02:11:22,453 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:22,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:11:22,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:22,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:11:22,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:11:22,454 INFO L87 Difference]: Start difference. First operand 27164 states and 35286 transitions. Second operand has 5 states, 5 states have (on average 24.2) internal successors, (121), 5 states have internal predecessors, (121), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:11:24,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:24,312 INFO L93 Difference]: Finished difference Result 54496 states and 70805 transitions. [2021-11-23 02:11:24,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:11:24,312 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 24.2) internal successors, (121), 5 states have internal predecessors, (121), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 341 [2021-11-23 02:11:24,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:24,420 INFO L225 Difference]: With dead ends: 54496 [2021-11-23 02:11:24,421 INFO L226 Difference]: Without dead ends: 27388 [2021-11-23 02:11:24,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1362 GetRequests, 1351 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:11:24,497 INFO L933 BasicCegarLoop]: 1460 mSDtfsCounter, 129 mSDsluCounter, 4186 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 5646 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:24,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 5646 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:11:24,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27388 states. [2021-11-23 02:11:26,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27388 to 27132. [2021-11-23 02:11:26,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27132 states, 18833 states have (on average 1.2788721924281845) internal successors, (24085), 19234 states have internal predecessors, (24085), 5584 states have call successors, (5584), 2766 states have call predecessors, (5584), 2714 states have return successors, (5553), 5396 states have call predecessors, (5553), 5553 states have call successors, (5553) [2021-11-23 02:11:26,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27132 states to 27132 states and 35222 transitions. [2021-11-23 02:11:26,279 INFO L78 Accepts]: Start accepts. Automaton has 27132 states and 35222 transitions. Word has length 341 [2021-11-23 02:11:26,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:26,280 INFO L470 AbstractCegarLoop]: Abstraction has 27132 states and 35222 transitions. [2021-11-23 02:11:26,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 24.2) internal successors, (121), 5 states have internal predecessors, (121), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-23 02:11:26,280 INFO L276 IsEmpty]: Start isEmpty. Operand 27132 states and 35222 transitions. [2021-11-23 02:11:26,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2021-11-23 02:11:26,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:26,298 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:26,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:26,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:26,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:26,706 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:26,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:26,706 INFO L85 PathProgramCache]: Analyzing trace with hash 2062063785, now seen corresponding path program 1 times [2021-11-23 02:11:26,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:26,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1100863449] [2021-11-23 02:11:26,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:26,708 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:26,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:26,709 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:26,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 02:11:28,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:28,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 1733 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:11:28,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:29,398 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2021-11-23 02:11:29,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:30,654 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 883 trivial. 0 not checked. [2021-11-23 02:11:30,654 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:30,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1100863449] [2021-11-23 02:11:30,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1100863449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:30,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2131878179] [2021-11-23 02:11:30,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:30,655 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:30,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:11:30,656 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:11:30,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 02:11:31,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:31,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 1733 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:11:31,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:32,294 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:32,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:33,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2131878179] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:33,189 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:11:33,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 02:11:33,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356962458] [2021-11-23 02:11:33,190 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:33,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:11:33,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:33,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:11:33,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:11:33,192 INFO L87 Difference]: Start difference. First operand 27132 states and 35222 transitions. Second operand has 8 states, 8 states have (on average 16.875) internal successors, (135), 8 states have internal predecessors, (135), 4 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (39), 4 states have call predecessors, (39), 4 states have call successors, (39) [2021-11-23 02:11:35,259 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:42,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:42,607 INFO L93 Difference]: Finished difference Result 72815 states and 94300 transitions. [2021-11-23 02:11:42,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:11:42,608 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 16.875) internal successors, (135), 8 states have internal predecessors, (135), 4 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (39), 4 states have call predecessors, (39), 4 states have call successors, (39) Word has length 339 [2021-11-23 02:11:42,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:42,740 INFO L225 Difference]: With dead ends: 72815 [2021-11-23 02:11:42,740 INFO L226 Difference]: Without dead ends: 45739 [2021-11-23 02:11:42,785 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1364 GetRequests, 1342 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:11:42,785 INFO L933 BasicCegarLoop]: 2717 mSDtfsCounter, 3442 mSDsluCounter, 9539 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 318 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3445 SdHoareTripleChecker+Valid, 12256 SdHoareTripleChecker+Invalid, 1075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 318 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:42,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3445 Valid, 12256 Invalid, 1075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [318 Valid, 756 Invalid, 1 Unknown, 0 Unchecked, 6.1s Time] [2021-11-23 02:11:42,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45739 states. [2021-11-23 02:11:44,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45739 to 27180. [2021-11-23 02:11:44,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27180 states, 18865 states have (on average 1.2779750861383514) internal successors, (24109), 19266 states have internal predecessors, (24109), 5600 states have call successors, (5600), 2766 states have call predecessors, (5600), 2714 states have return successors, (5569), 5412 states have call predecessors, (5569), 5569 states have call successors, (5569) [2021-11-23 02:11:44,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27180 states to 27180 states and 35278 transitions. [2021-11-23 02:11:44,422 INFO L78 Accepts]: Start accepts. Automaton has 27180 states and 35278 transitions. Word has length 339 [2021-11-23 02:11:44,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:44,422 INFO L470 AbstractCegarLoop]: Abstraction has 27180 states and 35278 transitions. [2021-11-23 02:11:44,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 16.875) internal successors, (135), 8 states have internal predecessors, (135), 4 states have call successors, (41), 2 states have call predecessors, (41), 2 states have return successors, (39), 4 states have call predecessors, (39), 4 states have call successors, (39) [2021-11-23 02:11:44,423 INFO L276 IsEmpty]: Start isEmpty. Operand 27180 states and 35278 transitions. [2021-11-23 02:11:44,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2021-11-23 02:11:44,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:44,431 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:44,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:44,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:44,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:44,856 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:44,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:44,857 INFO L85 PathProgramCache]: Analyzing trace with hash -31176132, now seen corresponding path program 1 times [2021-11-23 02:11:44,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:44,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1728347694] [2021-11-23 02:11:44,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:44,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:44,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:44,862 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:44,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 02:11:46,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:46,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 1810 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:11:46,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:47,547 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2021-11-23 02:11:47,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:48,736 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 883 trivial. 0 not checked. [2021-11-23 02:11:48,737 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:48,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1728347694] [2021-11-23 02:11:48,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1728347694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:48,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [558673849] [2021-11-23 02:11:48,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:48,737 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:48,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:11:48,738 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:11:48,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 02:11:49,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:49,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1810 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:11:49,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:50,710 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:50,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:52,053 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 930 trivial. 0 not checked. [2021-11-23 02:11:52,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [558673849] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:11:52,054 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:11:52,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-23 02:11:52,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278453563] [2021-11-23 02:11:52,055 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:11:52,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:11:52,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:52,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:11:52,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:11:52,057 INFO L87 Difference]: Start difference. First operand 27180 states and 35278 transitions. Second operand has 14 states, 14 states have (on average 10.928571428571429) internal successors, (153), 12 states have internal predecessors, (153), 4 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (40), 6 states have call predecessors, (40), 4 states have call successors, (40) [2021-11-23 02:11:54,121 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:11:56,167 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:12,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:12,627 INFO L93 Difference]: Finished difference Result 71261 states and 92810 transitions. [2021-11-23 02:12:12,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:12:12,628 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 10.928571428571429) internal successors, (153), 12 states have internal predecessors, (153), 4 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (40), 6 states have call predecessors, (40), 4 states have call successors, (40) Word has length 345 [2021-11-23 02:12:12,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:12,745 INFO L225 Difference]: With dead ends: 71261 [2021-11-23 02:12:12,745 INFO L226 Difference]: Without dead ends: 44137 [2021-11-23 02:12:12,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1406 GetRequests, 1362 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=267, Invalid=1803, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:12:12,795 INFO L933 BasicCegarLoop]: 3591 mSDtfsCounter, 3758 mSDsluCounter, 28435 mSDsCounter, 0 mSdLazyCounter, 2235 mSolverCounterSat, 761 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3788 SdHoareTripleChecker+Valid, 32026 SdHoareTripleChecker+Invalid, 2998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 761 IncrementalHoareTripleChecker+Valid, 2235 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:12,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3788 Valid, 32026 Invalid, 2998 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [761 Valid, 2235 Invalid, 2 Unknown, 0 Unchecked, 15.3s Time] [2021-11-23 02:12:12,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44137 states. [2021-11-23 02:12:15,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44137 to 33832. [2021-11-23 02:12:15,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33832 states, 23493 states have (on average 1.2722513089005236) internal successors, (29889), 23996 states have internal predecessors, (29889), 6971 states have call successors, (6971), 3387 states have call predecessors, (6971), 3367 states have return successors, (6972), 6758 states have call predecessors, (6972), 6940 states have call successors, (6972) [2021-11-23 02:12:15,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33832 states to 33832 states and 43832 transitions. [2021-11-23 02:12:15,450 INFO L78 Accepts]: Start accepts. Automaton has 33832 states and 43832 transitions. Word has length 345 [2021-11-23 02:12:15,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:15,451 INFO L470 AbstractCegarLoop]: Abstraction has 33832 states and 43832 transitions. [2021-11-23 02:12:15,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 10.928571428571429) internal successors, (153), 12 states have internal predecessors, (153), 4 states have call successors, (41), 2 states have call predecessors, (41), 4 states have return successors, (40), 6 states have call predecessors, (40), 4 states have call successors, (40) [2021-11-23 02:12:15,452 INFO L276 IsEmpty]: Start isEmpty. Operand 33832 states and 43832 transitions. [2021-11-23 02:12:15,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2021-11-23 02:12:15,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:15,464 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:15,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:15,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:15,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:12:15,874 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:15,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:15,875 INFO L85 PathProgramCache]: Analyzing trace with hash -735476777, now seen corresponding path program 1 times [2021-11-23 02:12:15,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:15,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1798009079] [2021-11-23 02:12:15,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:15,877 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:15,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:15,878 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:15,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 02:12:17,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:17,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 1827 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:12:17,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:18,830 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-23 02:12:18,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:20,164 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 892 trivial. 0 not checked. [2021-11-23 02:12:20,164 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:20,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1798009079] [2021-11-23 02:12:20,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1798009079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:20,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [476872324] [2021-11-23 02:12:20,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:20,165 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:20,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:12:20,165 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:12:20,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 02:12:20,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:21,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 1827 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:12:21,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:21,603 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-23 02:12:21,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:22,205 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 949 trivial. 0 not checked. [2021-11-23 02:12:22,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [476872324] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:22,205 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:12:22,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:12:22,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29288797] [2021-11-23 02:12:22,206 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:22,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:22,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:22,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:22,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:12:22,207 INFO L87 Difference]: Start difference. First operand 33832 states and 43832 transitions. Second operand has 3 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:12:24,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:12:26,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:26,063 INFO L93 Difference]: Finished difference Result 60676 states and 78275 transitions. [2021-11-23 02:12:26,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:26,063 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) Word has length 382 [2021-11-23 02:12:26,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:26,142 INFO L225 Difference]: With dead ends: 60676 [2021-11-23 02:12:26,142 INFO L226 Difference]: Without dead ends: 26900 [2021-11-23 02:12:26,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1524 GetRequests, 1517 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:12:26,194 INFO L933 BasicCegarLoop]: 2426 mSDtfsCounter, 1326 mSDsluCounter, 1379 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1326 SdHoareTripleChecker+Valid, 3805 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:26,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1326 Valid, 3805 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 8 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:12:26,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26900 states. [2021-11-23 02:12:27,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26900 to 26336. [2021-11-23 02:12:27,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26336 states, 18332 states have (on average 1.2671830678594806) internal successors, (23230), 18713 states have internal predecessors, (23230), 5313 states have call successors, (5313), 2687 states have call predecessors, (5313), 2690 states have return successors, (5308), 5173 states have call predecessors, (5308), 5284 states have call successors, (5308) [2021-11-23 02:12:27,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26336 states to 26336 states and 33851 transitions. [2021-11-23 02:12:27,749 INFO L78 Accepts]: Start accepts. Automaton has 26336 states and 33851 transitions. Word has length 382 [2021-11-23 02:12:27,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:27,750 INFO L470 AbstractCegarLoop]: Abstraction has 26336 states and 33851 transitions. [2021-11-23 02:12:27,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 3 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:12:27,750 INFO L276 IsEmpty]: Start isEmpty. Operand 26336 states and 33851 transitions. [2021-11-23 02:12:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2021-11-23 02:12:27,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:27,759 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:27,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:27,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 02:12:28,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:12:28,160 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:28,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:28,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1971142617, now seen corresponding path program 1 times [2021-11-23 02:12:28,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:28,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [489559301] [2021-11-23 02:12:28,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:28,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:28,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:28,163 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:28,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 02:12:29,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:29,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:12:29,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:31,173 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-23 02:12:31,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:32,526 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 892 trivial. 0 not checked. [2021-11-23 02:12:32,526 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:32,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [489559301] [2021-11-23 02:12:32,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [489559301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:32,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [169533364] [2021-11-23 02:12:32,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:32,526 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:32,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:12:32,527 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:12:32,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 02:12:33,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:33,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:12:33,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:34,715 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 936 trivial. 0 not checked. [2021-11-23 02:12:34,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:35,949 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 939 trivial. 0 not checked. [2021-11-23 02:12:35,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [169533364] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:35,949 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:12:35,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 15 [2021-11-23 02:12:35,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176802955] [2021-11-23 02:12:35,950 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:35,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:12:35,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:35,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:12:35,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:12:35,953 INFO L87 Difference]: Start difference. First operand 26336 states and 33851 transitions. Second operand has 9 states, 9 states have (on average 20.0) internal successors, (180), 9 states have internal predecessors, (180), 5 states have call successors, (60), 2 states have call predecessors, (60), 2 states have return successors, (58), 5 states have call predecessors, (58), 5 states have call successors, (58) [2021-11-23 02:12:38,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:38,917 INFO L93 Difference]: Finished difference Result 55854 states and 72551 transitions. [2021-11-23 02:12:38,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:12:38,920 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 20.0) internal successors, (180), 9 states have internal predecessors, (180), 5 states have call successors, (60), 2 states have call predecessors, (60), 2 states have return successors, (58), 5 states have call predecessors, (58), 5 states have call successors, (58) Word has length 382 [2021-11-23 02:12:38,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:39,035 INFO L225 Difference]: With dead ends: 55854 [2021-11-23 02:12:39,036 INFO L226 Difference]: Without dead ends: 29574 [2021-11-23 02:12:39,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1531 GetRequests, 1514 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:12:39,102 INFO L933 BasicCegarLoop]: 1757 mSDtfsCounter, 1569 mSDsluCounter, 7735 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1685 SdHoareTripleChecker+Valid, 9492 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:39,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1685 Valid, 9492 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:12:39,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29574 states. [2021-11-23 02:12:41,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29574 to 26396. [2021-11-23 02:12:41,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26396 states, 18377 states have (on average 1.2665288131904011) internal successors, (23275), 18758 states have internal predecessors, (23275), 5328 states have call successors, (5328), 2687 states have call predecessors, (5328), 2690 states have return successors, (5323), 5188 states have call predecessors, (5323), 5299 states have call successors, (5323) [2021-11-23 02:12:41,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26396 states to 26396 states and 33926 transitions. [2021-11-23 02:12:41,158 INFO L78 Accepts]: Start accepts. Automaton has 26396 states and 33926 transitions. Word has length 382 [2021-11-23 02:12:41,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:41,158 INFO L470 AbstractCegarLoop]: Abstraction has 26396 states and 33926 transitions. [2021-11-23 02:12:41,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 20.0) internal successors, (180), 9 states have internal predecessors, (180), 5 states have call successors, (60), 2 states have call predecessors, (60), 2 states have return successors, (58), 5 states have call predecessors, (58), 5 states have call successors, (58) [2021-11-23 02:12:41,159 INFO L276 IsEmpty]: Start isEmpty. Operand 26396 states and 33926 transitions. [2021-11-23 02:12:41,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2021-11-23 02:12:41,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:41,167 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:41,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:41,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:41,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:41,568 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:41,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:41,568 INFO L85 PathProgramCache]: Analyzing trace with hash -324380104, now seen corresponding path program 1 times [2021-11-23 02:12:41,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:41,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [519591066] [2021-11-23 02:12:41,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:41,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:41,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:41,571 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:41,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 02:12:42,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:43,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:12:43,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:44,513 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-23 02:12:44,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:45,925 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 892 trivial. 0 not checked. [2021-11-23 02:12:45,926 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:45,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [519591066] [2021-11-23 02:12:45,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [519591066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:45,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [384170384] [2021-11-23 02:12:45,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:45,926 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:45,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:12:45,927 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:12:45,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 02:12:48,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:48,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:12:48,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:49,787 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2021-11-23 02:12:49,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:50,921 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 892 trivial. 0 not checked. [2021-11-23 02:12:50,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [384170384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:50,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132824329] [2021-11-23 02:12:50,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:50,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:50,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:50,923 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:50,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 02:12:51,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:51,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:12:51,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:52,580 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-23 02:12:52,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:53,370 INFO L134 CoverageAnalysis]: Checked inductivity of 949 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 949 trivial. 0 not checked. [2021-11-23 02:12:53,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132824329] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:53,370 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-23 02:12:53,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5, 5, 5] total 14 [2021-11-23 02:12:53,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328631482] [2021-11-23 02:12:53,371 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:53,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:12:53,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:53,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:12:53,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:12:53,373 INFO L87 Difference]: Start difference. First operand 26396 states and 33926 transitions. Second operand has 8 states, 8 states have (on average 17.875) internal successors, (143), 8 states have internal predecessors, (143), 2 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:12:56,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:56,651 INFO L93 Difference]: Finished difference Result 34476 states and 46576 transitions. [2021-11-23 02:12:56,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:12:56,652 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 17.875) internal successors, (143), 8 states have internal predecessors, (143), 2 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) Word has length 384 [2021-11-23 02:12:56,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:56,780 INFO L225 Difference]: With dead ends: 34476 [2021-11-23 02:12:56,780 INFO L226 Difference]: Without dead ends: 33695 [2021-11-23 02:12:56,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2301 GetRequests, 2287 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:12:56,807 INFO L933 BasicCegarLoop]: 2239 mSDtfsCounter, 1375 mSDsluCounter, 7575 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1454 SdHoareTripleChecker+Valid, 9814 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:56,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1454 Valid, 9814 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:12:56,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33695 states. [2021-11-23 02:12:58,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33695 to 25921. [2021-11-23 02:12:58,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25921 states, 18081 states have (on average 1.2641999889386648) internal successors, (22858), 18433 states have internal predecessors, (22858), 5161 states have call successors, (5161), 2674 states have call predecessors, (5161), 2678 states have return successors, (5158), 5035 states have call predecessors, (5158), 5134 states have call successors, (5158) [2021-11-23 02:12:58,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25921 states to 25921 states and 33177 transitions. [2021-11-23 02:12:58,536 INFO L78 Accepts]: Start accepts. Automaton has 25921 states and 33177 transitions. Word has length 384 [2021-11-23 02:12:58,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:58,537 INFO L470 AbstractCegarLoop]: Abstraction has 25921 states and 33177 transitions. [2021-11-23 02:12:58,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 17.875) internal successors, (143), 8 states have internal predecessors, (143), 2 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:12:58,537 INFO L276 IsEmpty]: Start isEmpty. Operand 25921 states and 33177 transitions. [2021-11-23 02:12:58,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-23 02:12:58,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:58,547 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:58,558 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Ended with exit code 0 [2021-11-23 02:12:58,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:58,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 02:12:59,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:12:59,148 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:59,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:59,148 INFO L85 PathProgramCache]: Analyzing trace with hash 484418187, now seen corresponding path program 1 times [2021-11-23 02:12:59,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:59,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1092917312] [2021-11-23 02:12:59,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:59,150 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:59,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:59,151 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:59,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 02:13:00,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:00,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:13:00,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:02,111 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2021-11-23 02:13:02,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:03,585 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 913 trivial. 0 not checked. [2021-11-23 02:13:03,586 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:03,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1092917312] [2021-11-23 02:13:03,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1092917312] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:03,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [172483237] [2021-11-23 02:13:03,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:03,586 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:03,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:03,587 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:03,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 02:13:05,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:05,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:13:05,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:07,330 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2021-11-23 02:13:07,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:08,501 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 913 trivial. 0 not checked. [2021-11-23 02:13:08,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [172483237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:08,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844417391] [2021-11-23 02:13:08,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:08,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:08,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:08,502 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:08,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 02:13:09,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:09,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:13:09,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:09,993 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-23 02:13:09,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:10,843 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 949 trivial. 0 not checked. [2021-11-23 02:13:10,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844417391] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:10,843 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-23 02:13:10,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5, 5, 5] total 14 [2021-11-23 02:13:10,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306162790] [2021-11-23 02:13:10,844 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:10,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:13:10,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:10,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:13:10,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:13:10,845 INFO L87 Difference]: Start difference. First operand 25921 states and 33177 transitions. Second operand has 8 states, 8 states have (on average 18.5) internal successors, (148), 8 states have internal predecessors, (148), 2 states have call successors, (39), 2 states have call predecessors, (39), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:13:13,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:13,076 INFO L93 Difference]: Finished difference Result 47686 states and 62096 transitions. [2021-11-23 02:13:13,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:13:13,077 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 18.5) internal successors, (148), 8 states have internal predecessors, (148), 2 states have call successors, (39), 2 states have call predecessors, (39), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) Word has length 388 [2021-11-23 02:13:13,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:13,132 INFO L225 Difference]: With dead ends: 47686 [2021-11-23 02:13:13,133 INFO L226 Difference]: Without dead ends: 21821 [2021-11-23 02:13:13,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2326 GetRequests, 2311 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:13:13,179 INFO L933 BasicCegarLoop]: 1905 mSDtfsCounter, 1275 mSDsluCounter, 6102 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 451 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1276 SdHoareTripleChecker+Valid, 8007 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 451 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:13,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1276 Valid, 8007 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [451 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:13:13,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21821 states. [2021-11-23 02:13:14,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21821 to 14821. [2021-11-23 02:13:14,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14821 states, 10317 states have (on average 1.2582145972666472) internal successors, (12981), 10505 states have internal predecessors, (12981), 2883 states have call successors, (2883), 1621 states have call predecessors, (2883), 1620 states have return successors, (2875), 2818 states have call predecessors, (2875), 2864 states have call successors, (2875) [2021-11-23 02:13:14,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14821 states to 14821 states and 18739 transitions. [2021-11-23 02:13:14,269 INFO L78 Accepts]: Start accepts. Automaton has 14821 states and 18739 transitions. Word has length 388 [2021-11-23 02:13:14,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:14,270 INFO L470 AbstractCegarLoop]: Abstraction has 14821 states and 18739 transitions. [2021-11-23 02:13:14,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 18.5) internal successors, (148), 8 states have internal predecessors, (148), 2 states have call successors, (39), 2 states have call predecessors, (39), 2 states have return successors, (38), 2 states have call predecessors, (38), 2 states have call successors, (38) [2021-11-23 02:13:14,270 INFO L276 IsEmpty]: Start isEmpty. Operand 14821 states and 18739 transitions. [2021-11-23 02:13:14,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2021-11-23 02:13:14,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:14,283 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:14,323 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-23 02:13:14,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Ended with exit code 0 [2021-11-23 02:13:14,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:14,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:14,888 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:14,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:14,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1067146064, now seen corresponding path program 1 times [2021-11-23 02:13:14,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:14,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1990179372] [2021-11-23 02:13:14,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:14,890 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:14,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:14,891 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:14,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 02:13:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:16,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 2559 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:13:16,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:19,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 865 trivial. 0 not checked. [2021-11-23 02:13:19,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:20,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 1167 trivial. 0 not checked. [2021-11-23 02:13:20,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:20,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1990179372] [2021-11-23 02:13:20,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1990179372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:20,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2041974009] [2021-11-23 02:13:20,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:20,591 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:20,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:20,601 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:20,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 02:13:21,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:21,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 2559 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:13:21,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:22,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 1199 trivial. 0 not checked. [2021-11-23 02:13:22,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:23,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2021-11-23 02:13:24,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2041974009] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:24,000 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:13:24,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 02:13:24,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069931668] [2021-11-23 02:13:24,001 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:24,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:13:24,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:24,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:13:24,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:13:24,003 INFO L87 Difference]: Start difference. First operand 14821 states and 18739 transitions. Second operand has 3 states, 3 states have (on average 70.33333333333333) internal successors, (211), 3 states have internal predecessors, (211), 2 states have call successors, (69), 2 states have call predecessors, (69), 2 states have return successors, (67), 2 states have call predecessors, (67), 2 states have call successors, (67) [2021-11-23 02:13:26,288 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:27,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:27,036 INFO L93 Difference]: Finished difference Result 29597 states and 37451 transitions. [2021-11-23 02:13:27,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:13:27,039 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.33333333333333) internal successors, (211), 3 states have internal predecessors, (211), 2 states have call successors, (69), 2 states have call predecessors, (69), 2 states have return successors, (67), 2 states have call predecessors, (67), 2 states have call successors, (67) Word has length 535 [2021-11-23 02:13:27,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:27,073 INFO L225 Difference]: With dead ends: 29597 [2021-11-23 02:13:27,073 INFO L226 Difference]: Without dead ends: 14832 [2021-11-23 02:13:27,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2136 GetRequests, 2129 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:13:27,096 INFO L933 BasicCegarLoop]: 1444 mSDtfsCounter, 0 mSDsluCounter, 1440 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 2884 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:27,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 2884 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:13:27,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14832 states. [2021-11-23 02:13:28,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14832 to 14832. [2021-11-23 02:13:28,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14832 states, 10328 states have (on average 1.2579395817195973) internal successors, (12992), 10516 states have internal predecessors, (12992), 2883 states have call successors, (2883), 1621 states have call predecessors, (2883), 1620 states have return successors, (2875), 2818 states have call predecessors, (2875), 2864 states have call successors, (2875) [2021-11-23 02:13:28,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14832 states to 14832 states and 18750 transitions. [2021-11-23 02:13:28,053 INFO L78 Accepts]: Start accepts. Automaton has 14832 states and 18750 transitions. Word has length 535 [2021-11-23 02:13:28,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:28,053 INFO L470 AbstractCegarLoop]: Abstraction has 14832 states and 18750 transitions. [2021-11-23 02:13:28,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.33333333333333) internal successors, (211), 3 states have internal predecessors, (211), 2 states have call successors, (69), 2 states have call predecessors, (69), 2 states have return successors, (67), 2 states have call predecessors, (67), 2 states have call successors, (67) [2021-11-23 02:13:28,054 INFO L276 IsEmpty]: Start isEmpty. Operand 14832 states and 18750 transitions. [2021-11-23 02:13:28,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2021-11-23 02:13:28,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:28,066 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:28,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:28,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:28,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:13:28,467 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:28,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:28,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1064204658, now seen corresponding path program 1 times [2021-11-23 02:13:28,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:28,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2037453647] [2021-11-23 02:13:28,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:28,471 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:28,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:28,471 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:28,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 02:13:30,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:30,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 2561 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:13:30,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:32,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 865 trivial. 0 not checked. [2021-11-23 02:13:32,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:34,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 1167 trivial. 0 not checked. [2021-11-23 02:13:34,246 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:34,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2037453647] [2021-11-23 02:13:34,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2037453647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:34,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [672453561] [2021-11-23 02:13:34,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:34,247 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:34,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:34,248 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:34,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-23 02:13:35,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:35,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 2561 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:13:35,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:36,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 1152 trivial. 0 not checked. [2021-11-23 02:13:36,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:38,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2021-11-23 02:13:38,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [672453561] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:38,064 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:13:38,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-23 02:13:38,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161436034] [2021-11-23 02:13:38,065 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:38,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:13:38,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:38,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:13:38,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:13:38,067 INFO L87 Difference]: Start difference. First operand 14832 states and 18750 transitions. Second operand has 5 states, 5 states have (on average 44.2) internal successors, (221), 5 states have internal predecessors, (221), 2 states have call successors, (82), 2 states have call predecessors, (82), 2 states have return successors, (80), 2 states have call predecessors, (80), 2 states have call successors, (80) [2021-11-23 02:13:39,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:39,111 INFO L93 Difference]: Finished difference Result 29795 states and 37737 transitions. [2021-11-23 02:13:39,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:13:39,111 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 44.2) internal successors, (221), 5 states have internal predecessors, (221), 2 states have call successors, (82), 2 states have call predecessors, (82), 2 states have return successors, (80), 2 states have call predecessors, (80), 2 states have call successors, (80) Word has length 535 [2021-11-23 02:13:39,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:39,147 INFO L225 Difference]: With dead ends: 29795 [2021-11-23 02:13:39,148 INFO L226 Difference]: Without dead ends: 15019 [2021-11-23 02:13:39,172 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2138 GetRequests, 2127 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:13:39,173 INFO L933 BasicCegarLoop]: 1452 mSDtfsCounter, 14 mSDsluCounter, 4335 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 5787 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:39,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 5787 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:13:39,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15019 states. [2021-11-23 02:13:40,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15019 to 14865. [2021-11-23 02:13:40,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14865 states, 10361 states have (on average 1.2571180387993437) internal successors, (13025), 10549 states have internal predecessors, (13025), 2883 states have call successors, (2883), 1621 states have call predecessors, (2883), 1620 states have return successors, (2875), 2818 states have call predecessors, (2875), 2864 states have call successors, (2875) [2021-11-23 02:13:40,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14865 states to 14865 states and 18783 transitions. [2021-11-23 02:13:40,091 INFO L78 Accepts]: Start accepts. Automaton has 14865 states and 18783 transitions. Word has length 535 [2021-11-23 02:13:40,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:40,092 INFO L470 AbstractCegarLoop]: Abstraction has 14865 states and 18783 transitions. [2021-11-23 02:13:40,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 44.2) internal successors, (221), 5 states have internal predecessors, (221), 2 states have call successors, (82), 2 states have call predecessors, (82), 2 states have return successors, (80), 2 states have call predecessors, (80), 2 states have call successors, (80) [2021-11-23 02:13:40,092 INFO L276 IsEmpty]: Start isEmpty. Operand 14865 states and 18783 transitions. [2021-11-23 02:13:40,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 538 [2021-11-23 02:13:40,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:40,108 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:40,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:40,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:40,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:40,508 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:40,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:40,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1670720665, now seen corresponding path program 1 times [2021-11-23 02:13:40,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:40,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1165189485] [2021-11-23 02:13:40,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:40,511 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:40,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:40,512 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:40,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 02:13:42,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:42,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 2568 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:13:42,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:44,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 358 proven. 1 refuted. 0 times theorem prover too weak. 865 trivial. 0 not checked. [2021-11-23 02:13:44,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:46,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 1167 trivial. 0 not checked. [2021-11-23 02:13:46,222 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:46,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1165189485] [2021-11-23 02:13:46,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1165189485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:46,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1616078894] [2021-11-23 02:13:46,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:46,222 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:46,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:46,223 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:46,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 02:13:47,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:47,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 2568 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:13:47,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:49,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 1152 trivial. 0 not checked. [2021-11-23 02:13:49,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:53,610 INFO L134 CoverageAnalysis]: Checked inductivity of 1224 backedges. 10 proven. 36 refuted. 0 times theorem prover too weak. 1178 trivial. 0 not checked. [2021-11-23 02:13:53,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1616078894] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:13:53,610 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:13:53,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5, 9] total 23 [2021-11-23 02:13:53,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455428123] [2021-11-23 02:13:53,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:53,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:13:53,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:53,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:13:53,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=447, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:13:53,612 INFO L87 Difference]: Start difference. First operand 14865 states and 18783 transitions. Second operand has 10 states, 10 states have (on average 19.3) internal successors, (193), 8 states have internal predecessors, (193), 3 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 5 states have call predecessors, (55), 3 states have call successors, (55) [2021-11-23 02:13:57,840 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:13:59,867 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:00,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:00,516 INFO L93 Difference]: Finished difference Result 29878 states and 37802 transitions. [2021-11-23 02:14:00,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:14:00,518 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 19.3) internal successors, (193), 8 states have internal predecessors, (193), 3 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 5 states have call predecessors, (55), 3 states have call successors, (55) Word has length 537 [2021-11-23 02:14:00,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:00,556 INFO L225 Difference]: With dead ends: 29878 [2021-11-23 02:14:00,556 INFO L226 Difference]: Without dead ends: 15069 [2021-11-23 02:14:00,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2146 GetRequests, 2123 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:14:00,584 INFO L933 BasicCegarLoop]: 1442 mSDtfsCounter, 370 mSDsluCounter, 11015 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 487 SdHoareTripleChecker+Valid, 12457 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:00,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [487 Valid, 12457 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 79 Invalid, 2 Unknown, 0 Unchecked, 5.7s Time] [2021-11-23 02:14:00,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15069 states. [2021-11-23 02:14:01,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15069 to 14964. [2021-11-23 02:14:01,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14964 states, 10438 states have (on average 1.2552213067637479) internal successors, (13102), 10626 states have internal predecessors, (13102), 2883 states have call successors, (2883), 1621 states have call predecessors, (2883), 1642 states have return successors, (2967), 2840 states have call predecessors, (2967), 2864 states have call successors, (2967) [2021-11-23 02:14:01,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14964 states to 14964 states and 18952 transitions. [2021-11-23 02:14:01,550 INFO L78 Accepts]: Start accepts. Automaton has 14964 states and 18952 transitions. Word has length 537 [2021-11-23 02:14:01,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:01,550 INFO L470 AbstractCegarLoop]: Abstraction has 14964 states and 18952 transitions. [2021-11-23 02:14:01,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 19.3) internal successors, (193), 8 states have internal predecessors, (193), 3 states have call successors, (57), 2 states have call predecessors, (57), 4 states have return successors, (55), 5 states have call predecessors, (55), 3 states have call successors, (55) [2021-11-23 02:14:01,551 INFO L276 IsEmpty]: Start isEmpty. Operand 14964 states and 18952 transitions. [2021-11-23 02:14:01,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 574 [2021-11-23 02:14:01,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:01,565 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:01,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:01,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:01,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:14:01,975 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:01,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:01,976 INFO L85 PathProgramCache]: Analyzing trace with hash -978827637, now seen corresponding path program 1 times [2021-11-23 02:14:01,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:14:01,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2080664519] [2021-11-23 02:14:01,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:01,978 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:14:01,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:14:01,979 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:14:01,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 02:14:03,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:04,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 2658 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:14:04,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:06,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 526 proven. 1 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2021-11-23 02:14:06,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:08,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 1497 trivial. 0 not checked. [2021-11-23 02:14:08,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:14:08,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2080664519] [2021-11-23 02:14:08,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2080664519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:08,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1131815438] [2021-11-23 02:14:08,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:08,010 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:14:08,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:14:08,011 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:14:08,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 02:14:09,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:09,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 2658 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:14:09,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:11,506 INFO L354 Elim1Store]: treesize reduction 66, result has 1.5 percent of original size [2021-11-23 02:14:11,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 66 treesize of output 22 [2021-11-23 02:14:11,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1554 trivial. 0 not checked. [2021-11-23 02:14:11,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:15,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1554 trivial. 0 not checked. [2021-11-23 02:14:15,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1131815438] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:15,430 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:14:15,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 14 [2021-11-23 02:14:15,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235511638] [2021-11-23 02:14:15,432 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:15,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:14:15,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:14:15,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:14:15,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=143, Unknown=1, NotChecked=0, Total=182 [2021-11-23 02:14:15,434 INFO L87 Difference]: Start difference. First operand 14964 states and 18952 transitions. Second operand has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 3 states have call successors, (60), 3 states have call predecessors, (60), 2 states have return successors, (58), 2 states have call predecessors, (58), 2 states have call successors, (58) [2021-11-23 02:14:17,547 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:23,683 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:25,840 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:27,325 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:29,347 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:33,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:35,390 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:38,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:38,662 INFO L93 Difference]: Finished difference Result 30096 states and 38127 transitions. [2021-11-23 02:14:38,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:14:38,674 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 3 states have call successors, (60), 3 states have call predecessors, (60), 2 states have return successors, (58), 2 states have call predecessors, (58), 2 states have call successors, (58) Word has length 573 [2021-11-23 02:14:38,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:38,732 INFO L225 Difference]: With dead ends: 30096 [2021-11-23 02:14:38,732 INFO L226 Difference]: Without dead ends: 15188 [2021-11-23 02:14:38,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2289 GetRequests, 2271 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=45, Invalid=164, Unknown=1, NotChecked=0, Total=210 [2021-11-23 02:14:38,766 INFO L933 BasicCegarLoop]: 1471 mSDtfsCounter, 26 mSDsluCounter, 6965 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 3 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 8436 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 22.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:38,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 8436 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 248 Invalid, 6 Unknown, 148 Unchecked, 22.2s Time] [2021-11-23 02:14:38,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15188 states. [2021-11-23 02:14:39,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15188 to 15092. [2021-11-23 02:14:39,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15092 states, 10532 states have (on average 1.2537030003797949) internal successors, (13204), 10720 states have internal predecessors, (13204), 2895 states have call successors, (2895), 1643 states have call predecessors, (2895), 1664 states have return successors, (2979), 2852 states have call predecessors, (2979), 2876 states have call successors, (2979) [2021-11-23 02:14:39,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15092 states to 15092 states and 19078 transitions. [2021-11-23 02:14:39,876 INFO L78 Accepts]: Start accepts. Automaton has 15092 states and 19078 transitions. Word has length 573 [2021-11-23 02:14:39,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:39,877 INFO L470 AbstractCegarLoop]: Abstraction has 15092 states and 19078 transitions. [2021-11-23 02:14:39,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 24.25) internal successors, (194), 8 states have internal predecessors, (194), 3 states have call successors, (60), 3 states have call predecessors, (60), 2 states have return successors, (58), 2 states have call predecessors, (58), 2 states have call successors, (58) [2021-11-23 02:14:39,878 INFO L276 IsEmpty]: Start isEmpty. Operand 15092 states and 19078 transitions. [2021-11-23 02:14:39,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 550 [2021-11-23 02:14:39,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:39,890 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:39,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:40,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:40,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:14:40,311 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:40,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:40,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1828278385, now seen corresponding path program 1 times [2021-11-23 02:14:40,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:14:40,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [986933238] [2021-11-23 02:14:40,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:40,314 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:14:40,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:14:40,315 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:14:40,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 02:14:42,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:42,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 2596 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:14:42,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:44,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1267 backedges. 386 proven. 1 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2021-11-23 02:14:44,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:46,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1267 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2021-11-23 02:14:46,192 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:14:46,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [986933238] [2021-11-23 02:14:46,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [986933238] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:46,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1480594167] [2021-11-23 02:14:46,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:46,193 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:14:46,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:14:46,203 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:14:46,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_27609b2f-2730-4a53-8d9f-f287566ee980/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 02:14:47,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:47,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 2596 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:14:47,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:49,622 INFO L354 Elim1Store]: treesize reduction 66, result has 1.5 percent of original size [2021-11-23 02:14:49,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 66 treesize of output 22 [2021-11-23 02:14:49,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1267 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1267 trivial. 0 not checked. [2021-11-23 02:14:49,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:53,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1267 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1267 trivial. 0 not checked. [2021-11-23 02:14:53,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1480594167] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:53,096 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:14:53,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 14 [2021-11-23 02:14:53,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105354506] [2021-11-23 02:14:53,097 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:53,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:14:53,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:14:53,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:14:53,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=143, Unknown=1, NotChecked=0, Total=182 [2021-11-23 02:14:53,099 INFO L87 Difference]: Start difference. First operand 15092 states and 19078 transitions. Second operand has 8 states, 8 states have (on average 24.5) internal successors, (196), 8 states have internal predecessors, (196), 3 states have call successors, (62), 3 states have call predecessors, (62), 2 states have return successors, (60), 2 states have call predecessors, (60), 2 states have call successors, (60) [2021-11-23 02:14:55,175 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:57,190 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:03,152 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:05,164 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:07,326 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:09,343 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:10,920 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:12,942 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers []