./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 93a1ae2d9d86f9fff42650a9c6bf56405d253963 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 93a1ae2d9d86f9fff42650a9c6bf56405d253963 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 00:31:10,436 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 00:31:10,439 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 00:31:10,490 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 00:31:10,491 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 00:31:10,495 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 00:31:10,497 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 00:31:10,501 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 00:31:10,503 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 00:31:10,509 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 00:31:10,510 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 00:31:10,512 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 00:31:10,512 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 00:31:10,515 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 00:31:10,517 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 00:31:10,522 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 00:31:10,523 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 00:31:10,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 00:31:10,527 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 00:31:10,534 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 00:31:10,536 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 00:31:10,538 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 00:31:10,541 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 00:31:10,542 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 00:31:10,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 00:31:10,551 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 00:31:10,552 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 00:31:10,554 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 00:31:10,554 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 00:31:10,556 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 00:31:10,556 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 00:31:10,557 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 00:31:10,559 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 00:31:10,560 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 00:31:10,562 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 00:31:10,562 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 00:31:10,563 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 00:31:10,563 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 00:31:10,564 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 00:31:10,565 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 00:31:10,565 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 00:31:10,566 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-13 00:31:10,616 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 00:31:10,616 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 00:31:10,617 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-13 00:31:10,617 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-13 00:31:10,625 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 00:31:10,625 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 00:31:10,625 INFO L138 SettingsManager]: * Use SBE=true [2021-10-13 00:31:10,626 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 00:31:10,626 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 00:31:10,626 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 00:31:10,627 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 00:31:10,628 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 00:31:10,628 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 00:31:10,628 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 00:31:10,628 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 00:31:10,628 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 00:31:10,629 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 00:31:10,629 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 00:31:10,629 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 00:31:10,636 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 00:31:10,636 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 00:31:10,637 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 00:31:10,637 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 00:31:10,637 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:31:10,637 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 00:31:10,638 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 00:31:10,638 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-13 00:31:10,638 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 00:31:10,638 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 00:31:10,640 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93a1ae2d9d86f9fff42650a9c6bf56405d253963 [2021-10-13 00:31:10,958 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 00:31:10,987 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 00:31:10,991 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 00:31:10,993 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 00:31:10,994 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 00:31:10,995 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-10-13 00:31:11,073 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/4fd8f303c/fa87d107caef465883c7332e3c97c5dc/FLAGff77ac922 [2021-10-13 00:31:11,621 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 00:31:11,622 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-10-13 00:31:11,645 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/4fd8f303c/fa87d107caef465883c7332e3c97c5dc/FLAGff77ac922 [2021-10-13 00:31:11,883 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/4fd8f303c/fa87d107caef465883c7332e3c97c5dc [2021-10-13 00:31:11,885 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 00:31:11,887 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-13 00:31:11,888 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 00:31:11,888 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 00:31:11,892 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 00:31:11,892 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:31:11" (1/1) ... [2021-10-13 00:31:11,894 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a855d3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:11, skipping insertion in model container [2021-10-13 00:31:11,894 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:31:11" (1/1) ... [2021-10-13 00:31:11,912 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 00:31:11,956 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 00:31:12,308 WARN L228 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_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-10-13 00:31:12,310 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:31:12,318 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 00:31:12,356 WARN L228 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_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-10-13 00:31:12,357 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:31:12,386 INFO L208 MainTranslator]: Completed translation [2021-10-13 00:31:12,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12 WrapperNode [2021-10-13 00:31:12,387 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 00:31:12,388 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 00:31:12,388 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 00:31:12,388 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 00:31:12,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,442 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,442 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,471 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,475 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,489 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,500 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 00:31:12,516 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 00:31:12,516 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 00:31:12,516 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 00:31:12,517 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (1/1) ... [2021-10-13 00:31:12,528 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:31:12,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:12,557 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 00:31:12,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 00:31:12,607 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-13 00:31:12,607 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 00:31:12,608 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-13 00:31:12,609 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-13 00:31:12,609 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-13 00:31:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-13 00:31:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-13 00:31:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-10-13 00:31:12,611 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_remove_last [2021-10-13 00:31:12,612 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-13 00:31:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-13 00:31:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-13 00:31:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-13 00:31:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-13 00:31:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-13 00:31:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-13 00:31:12,615 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-13 00:31:12,616 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-13 00:31:12,617 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-13 00:31:12,618 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-13 00:31:12,619 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-13 00:31:12,619 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-13 00:31:12,619 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-13 00:31:12,619 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-13 00:31:12,619 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-13 00:31:12,620 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-13 00:31:12,621 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-13 00:31:12,622 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-13 00:31:12,623 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-13 00:31:12,623 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-13 00:31:12,627 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-13 00:31:12,627 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-13 00:31:12,627 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-13 00:31:12,627 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-13 00:31:12,628 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-13 00:31:12,628 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-13 00:31:12,628 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-13 00:31:12,628 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-13 00:31:12,628 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-13 00:31:12,629 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-13 00:31:12,629 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-13 00:31:12,629 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-13 00:31:12,630 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-13 00:31:12,631 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-13 00:31:12,632 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-13 00:31:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-13 00:31:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-13 00:31:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-13 00:31:12,633 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-13 00:31:12,634 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-13 00:31:12,634 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-13 00:31:12,634 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-13 00:31:12,635 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-13 00:31:12,635 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-13 00:31:12,635 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-13 00:31:12,635 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-13 00:31:12,635 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-13 00:31:12,636 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 00:31:12,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-13 00:31:12,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 00:31:12,637 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-10-13 00:31:12,638 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_remove_last [2021-10-13 00:31:12,639 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-13 00:31:12,641 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 00:31:12,642 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-13 00:31:12,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-13 00:31:12,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-13 00:31:12,643 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 00:31:12,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 00:31:12,644 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 00:31:13,103 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-13 00:31:13,324 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 00:31:13,326 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-10-13 00:31:13,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:31:13 BoogieIcfgContainer [2021-10-13 00:31:13,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 00:31:13,332 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 00:31:13,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 00:31:13,336 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 00:31:13,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 12:31:11" (1/3) ... [2021-10-13 00:31:13,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337256bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:31:13, skipping insertion in model container [2021-10-13 00:31:13,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:31:12" (2/3) ... [2021-10-13 00:31:13,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337256bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:31:13, skipping insertion in model container [2021-10-13 00:31:13,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:31:13" (3/3) ... [2021-10-13 00:31:13,340 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all_reverse.i [2021-10-13 00:31:13,350 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 00:31:13,350 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2021-10-13 00:31:13,413 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 00:31:13,422 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=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-10-13 00:31:13,423 INFO L340 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2021-10-13 00:31:13,445 INFO L276 IsEmpty]: Start isEmpty. Operand has 112 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 99 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:13,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 00:31:13,453 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:13,453 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:13,454 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:13,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:13,459 INFO L82 PathProgramCache]: Analyzing trace with hash 380935315, now seen corresponding path program 1 times [2021-10-13 00:31:13,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:13,469 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350849973] [2021-10-13 00:31:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:13,470 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:13,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:13,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:13,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:13,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:13,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:13,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350849973] [2021-10-13 00:31:13,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350849973] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:13,688 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:13,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:31:13,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302220060] [2021-10-13 00:31:13,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:31:13,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:13,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:31:13,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:31:13,710 INFO L87 Difference]: Start difference. First operand has 112 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 99 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:31:13,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:13,983 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2021-10-13 00:31:13,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:31:13,986 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-10-13 00:31:13,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:13,995 INFO L225 Difference]: With dead ends: 109 [2021-10-13 00:31:13,996 INFO L226 Difference]: Without dead ends: 103 [2021-10-13 00:31:13,998 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:31:14,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-13 00:31:14,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-13 00:31:14,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 52 states have (on average 1.8461538461538463) internal successors, (96), 92 states have internal predecessors, (96), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:31:14,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 107 transitions. [2021-10-13 00:31:14,049 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 107 transitions. Word has length 12 [2021-10-13 00:31:14,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:14,049 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 107 transitions. [2021-10-13 00:31:14,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:31:14,050 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 107 transitions. [2021-10-13 00:31:14,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 00:31:14,050 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:14,051 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:14,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 00:31:14,051 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:14,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:14,052 INFO L82 PathProgramCache]: Analyzing trace with hash 380935316, now seen corresponding path program 1 times [2021-10-13 00:31:14,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:14,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968346515] [2021-10-13 00:31:14,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:14,053 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:14,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:14,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:14,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:14,207 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:14,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968346515] [2021-10-13 00:31:14,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968346515] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:14,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:14,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:31:14,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915027338] [2021-10-13 00:31:14,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:31:14,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:14,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:31:14,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:31:14,214 INFO L87 Difference]: Start difference. First operand 103 states and 107 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:31:14,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:14,416 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-10-13 00:31:14,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:31:14,417 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-10-13 00:31:14,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:14,421 INFO L225 Difference]: With dead ends: 100 [2021-10-13 00:31:14,421 INFO L226 Difference]: Without dead ends: 100 [2021-10-13 00:31:14,422 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:31:14,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-13 00:31:14,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-13 00:31:14,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 52 states have (on average 1.7884615384615385) internal successors, (93), 89 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:31:14,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-10-13 00:31:14,442 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 12 [2021-10-13 00:31:14,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:14,443 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-10-13 00:31:14,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:31:14,443 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-10-13 00:31:14,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-13 00:31:14,444 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:14,444 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:14,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 00:31:14,445 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:14,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:14,446 INFO L82 PathProgramCache]: Analyzing trace with hash 319280211, now seen corresponding path program 1 times [2021-10-13 00:31:14,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:14,447 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156632425] [2021-10-13 00:31:14,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:14,448 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:14,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:14,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:14,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:14,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:14,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:14,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:14,643 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:14,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156632425] [2021-10-13 00:31:14,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156632425] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:14,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:14,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:31:14,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985102961] [2021-10-13 00:31:14,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:31:14,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:14,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:31:14,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:31:14,658 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:31:15,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:15,055 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2021-10-13 00:31:15,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:31:15,056 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-10-13 00:31:15,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:15,059 INFO L225 Difference]: With dead ends: 111 [2021-10-13 00:31:15,060 INFO L226 Difference]: Without dead ends: 111 [2021-10-13 00:31:15,060 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 141.1ms TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:31:15,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-10-13 00:31:15,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 101. [2021-10-13 00:31:15,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 90 states have internal predecessors, (94), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:31:15,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 105 transitions. [2021-10-13 00:31:15,086 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 105 transitions. Word has length 20 [2021-10-13 00:31:15,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:15,086 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 105 transitions. [2021-10-13 00:31:15,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:31:15,087 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 105 transitions. [2021-10-13 00:31:15,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-13 00:31:15,088 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:15,088 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:15,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 00:31:15,089 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:15,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:15,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1410531270, now seen corresponding path program 1 times [2021-10-13 00:31:15,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:15,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440588129] [2021-10-13 00:31:15,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:15,091 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:15,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:15,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:15,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:15,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,279 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:31:15,279 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:15,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440588129] [2021-10-13 00:31:15,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440588129] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:15,280 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:15,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:31:15,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487177765] [2021-10-13 00:31:15,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:31:15,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:15,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:31:15,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:31:15,282 INFO L87 Difference]: Start difference. First operand 101 states and 105 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:15,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:15,637 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2021-10-13 00:31:15,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:31:15,638 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-10-13 00:31:15,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:15,640 INFO L225 Difference]: With dead ends: 101 [2021-10-13 00:31:15,640 INFO L226 Difference]: Without dead ends: 101 [2021-10-13 00:31:15,641 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 82.7ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:31:15,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-10-13 00:31:15,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-10-13 00:31:15,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 53 states have (on average 1.7547169811320755) internal successors, (93), 89 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:31:15,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-10-13 00:31:15,647 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 30 [2021-10-13 00:31:15,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:15,647 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-10-13 00:31:15,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:15,648 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-10-13 00:31:15,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-13 00:31:15,649 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:15,649 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:15,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 00:31:15,649 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:15,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:15,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1410531269, now seen corresponding path program 1 times [2021-10-13 00:31:15,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:15,650 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322095906] [2021-10-13 00:31:15,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:15,651 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:15,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:15,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:15,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:15,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:15,800 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:15,800 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:15,800 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322095906] [2021-10-13 00:31:15,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322095906] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:15,801 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:15,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:31:15,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208187218] [2021-10-13 00:31:15,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:31:15,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:15,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:31:15,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:31:15,803 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:16,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:16,147 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-10-13 00:31:16,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:31:16,147 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-10-13 00:31:16,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:16,148 INFO L225 Difference]: With dead ends: 100 [2021-10-13 00:31:16,148 INFO L226 Difference]: Without dead ends: 100 [2021-10-13 00:31:16,149 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 88.6ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:31:16,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-13 00:31:16,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-10-13 00:31:16,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 53 states have (on average 1.7358490566037736) internal successors, (92), 88 states have internal predecessors, (92), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:31:16,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2021-10-13 00:31:16,153 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 30 [2021-10-13 00:31:16,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:16,154 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2021-10-13 00:31:16,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:16,154 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2021-10-13 00:31:16,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:31:16,155 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:16,155 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:16,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-13 00:31:16,156 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:16,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:16,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1689114939, now seen corresponding path program 1 times [2021-10-13 00:31:16,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:16,156 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239412108] [2021-10-13 00:31:16,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:16,157 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:16,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:16,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:16,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:16,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:16,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:16,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:16,333 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:16,333 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:16,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239412108] [2021-10-13 00:31:16,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239412108] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:16,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072545789] [2021-10-13 00:31:16,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:16,335 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:16,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:16,338 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:16,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 00:31:16,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:16,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 00:31:16,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:16,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:16,776 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-13 00:31:16,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 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 [2021-10-13 00:31:16,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:16,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072545789] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:16,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:16,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-10-13 00:31:16,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637012984] [2021-10-13 00:31:16,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-10-13 00:31:16,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:16,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-13 00:31:16,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:31:16,924 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:17,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:17,404 INFO L93 Difference]: Finished difference Result 107 states and 113 transitions. [2021-10-13 00:31:17,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:31:17,404 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-10-13 00:31:17,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:17,405 INFO L225 Difference]: With dead ends: 107 [2021-10-13 00:31:17,406 INFO L226 Difference]: Without dead ends: 107 [2021-10-13 00:31:17,406 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 199.1ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:31:17,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-13 00:31:17,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 104. [2021-10-13 00:31:17,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 57 states have (on average 1.719298245614035) internal successors, (98), 92 states have internal predecessors, (98), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:17,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 111 transitions. [2021-10-13 00:31:17,412 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 111 transitions. Word has length 32 [2021-10-13 00:31:17,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:17,412 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 111 transitions. [2021-10-13 00:31:17,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:17,413 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 111 transitions. [2021-10-13 00:31:17,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:31:17,414 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:17,414 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:17,446 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-13 00:31:17,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-10-13 00:31:17,627 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:17,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:17,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1689114940, now seen corresponding path program 1 times [2021-10-13 00:31:17,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:17,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217572808] [2021-10-13 00:31:17,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:17,628 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:17,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:17,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:17,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:17,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:17,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:17,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:17,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:17,879 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:17,879 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:17,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217572808] [2021-10-13 00:31:17,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217572808] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:17,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605824351] [2021-10-13 00:31:17,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:17,880 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:17,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:17,881 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:17,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-13 00:31:18,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:18,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-13 00:31:18,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:18,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:18,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:18,472 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:31:18,473 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 1 case distinctions, treesize of input 22 treesize of output 24 [2021-10-13 00:31:18,481 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:31:18,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 00:31:18,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:18,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605824351] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:18,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:18,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-10-13 00:31:18,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283393503] [2021-10-13 00:31:18,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:18,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:18,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:18,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:18,578 INFO L87 Difference]: Start difference. First operand 104 states and 111 transitions. Second operand has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:19,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:19,266 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2021-10-13 00:31:19,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:31:19,267 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-10-13 00:31:19,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:19,268 INFO L225 Difference]: With dead ends: 106 [2021-10-13 00:31:19,268 INFO L226 Difference]: Without dead ends: 106 [2021-10-13 00:31:19,268 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 324.3ms TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-10-13 00:31:19,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-10-13 00:31:19,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2021-10-13 00:31:19,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 92 states have internal predecessors, (97), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:19,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 110 transitions. [2021-10-13 00:31:19,273 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 110 transitions. Word has length 32 [2021-10-13 00:31:19,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:19,273 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 110 transitions. [2021-10-13 00:31:19,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:19,273 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 110 transitions. [2021-10-13 00:31:19,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 00:31:19,274 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:19,274 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:19,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:19,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:19,483 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:19,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:19,484 INFO L82 PathProgramCache]: Analyzing trace with hash -258027215, now seen corresponding path program 1 times [2021-10-13 00:31:19,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:19,484 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105900853] [2021-10-13 00:31:19,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:19,485 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:19,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:19,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:19,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:19,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:19,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:19,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:19,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:19,596 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:19,597 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:19,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105900853] [2021-10-13 00:31:19,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105900853] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:19,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177987477] [2021-10-13 00:31:19,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:19,598 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:19,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:19,599 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:19,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-13 00:31:19,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:19,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 00:31:19,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:19,909 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:19,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177987477] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:19,910 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:19,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 8 [2021-10-13 00:31:19,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516827340] [2021-10-13 00:31:19,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:31:19,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:19,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:31:19,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:31:19,911 INFO L87 Difference]: Start difference. First operand 104 states and 110 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:31:20,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:20,174 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2021-10-13 00:31:20,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:31:20,175 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-10-13 00:31:20,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:20,176 INFO L225 Difference]: With dead ends: 105 [2021-10-13 00:31:20,176 INFO L226 Difference]: Without dead ends: 105 [2021-10-13 00:31:20,176 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 80.4ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:31:20,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-10-13 00:31:20,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2021-10-13 00:31:20,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 57 states have (on average 1.6842105263157894) internal successors, (96), 92 states have internal predecessors, (96), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:20,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 109 transitions. [2021-10-13 00:31:20,179 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 109 transitions. Word has length 34 [2021-10-13 00:31:20,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:20,179 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 109 transitions. [2021-10-13 00:31:20,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:31:20,180 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 109 transitions. [2021-10-13 00:31:20,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 00:31:20,181 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:20,181 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:20,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:20,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:20,391 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:20,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:20,392 INFO L82 PathProgramCache]: Analyzing trace with hash 586310269, now seen corresponding path program 1 times [2021-10-13 00:31:20,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:20,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013971559] [2021-10-13 00:31:20,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:20,392 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:20,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:20,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:20,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:20,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:20,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:20,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:20,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:20,504 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:20,504 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:20,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013971559] [2021-10-13 00:31:20,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013971559] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:20,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542384491] [2021-10-13 00:31:20,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:20,505 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:20,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:20,506 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:20,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-13 00:31:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:20,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 00:31:20,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:20,799 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:20,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542384491] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:20,800 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:20,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3] total 6 [2021-10-13 00:31:20,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670447061] [2021-10-13 00:31:20,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:31:20,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:20,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:31:20,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:31:20,802 INFO L87 Difference]: Start difference. First operand 104 states and 109 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:21,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:21,103 INFO L93 Difference]: Finished difference Result 109 states and 116 transitions. [2021-10-13 00:31:21,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:31:21,103 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-10-13 00:31:21,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:21,104 INFO L225 Difference]: With dead ends: 109 [2021-10-13 00:31:21,104 INFO L226 Difference]: Without dead ends: 109 [2021-10-13 00:31:21,105 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 73.4ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:31:21,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-10-13 00:31:21,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-10-13 00:31:21,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 60 states have (on average 1.6833333333333333) internal successors, (101), 95 states have internal predecessors, (101), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:21,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 114 transitions. [2021-10-13 00:31:21,108 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 114 transitions. Word has length 35 [2021-10-13 00:31:21,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:21,109 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 114 transitions. [2021-10-13 00:31:21,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:21,109 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 114 transitions. [2021-10-13 00:31:21,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 00:31:21,110 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:21,110 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:21,137 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-10-13 00:31:21,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-10-13 00:31:21,319 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:21,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:21,320 INFO L82 PathProgramCache]: Analyzing trace with hash 586310270, now seen corresponding path program 1 times [2021-10-13 00:31:21,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:21,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387303072] [2021-10-13 00:31:21,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:21,320 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:21,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:21,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:21,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:21,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:21,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:21,507 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:21,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:21,517 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:21,517 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:21,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387303072] [2021-10-13 00:31:21,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387303072] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:21,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994323843] [2021-10-13 00:31:21,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:21,518 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:21,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:21,528 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:21,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-13 00:31:21,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:21,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 00:31:21,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:21,950 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:21,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994323843] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:21,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:21,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 14 [2021-10-13 00:31:21,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340788332] [2021-10-13 00:31:21,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:21,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:21,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:21,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:21,954 INFO L87 Difference]: Start difference. First operand 107 states and 114 transitions. Second operand has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:31:22,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:22,442 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2021-10-13 00:31:22,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:31:22,443 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-10-13 00:31:22,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:22,444 INFO L225 Difference]: With dead ends: 114 [2021-10-13 00:31:22,444 INFO L226 Difference]: Without dead ends: 114 [2021-10-13 00:31:22,444 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 181.9ms TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:31:22,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-10-13 00:31:22,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 107. [2021-10-13 00:31:22,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 60 states have (on average 1.6666666666666667) internal successors, (100), 95 states have internal predecessors, (100), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:22,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2021-10-13 00:31:22,449 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 35 [2021-10-13 00:31:22,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:22,449 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2021-10-13 00:31:22,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:31:22,450 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2021-10-13 00:31:22,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-13 00:31:22,450 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:22,450 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:22,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:22,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:22,662 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:22,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:22,662 INFO L82 PathProgramCache]: Analyzing trace with hash 995749165, now seen corresponding path program 1 times [2021-10-13 00:31:22,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:22,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043542298] [2021-10-13 00:31:22,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:22,663 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:22,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:22,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:22,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:22,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:22,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:22,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:22,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:22,765 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:31:22,766 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:22,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043542298] [2021-10-13 00:31:22,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043542298] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:22,766 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:22,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-10-13 00:31:22,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307309810] [2021-10-13 00:31:22,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:31:22,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:22,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:31:22,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:31:22,768 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:23,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:23,106 INFO L93 Difference]: Finished difference Result 107 states and 113 transitions. [2021-10-13 00:31:23,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:31:23,106 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-10-13 00:31:23,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:23,107 INFO L225 Difference]: With dead ends: 107 [2021-10-13 00:31:23,107 INFO L226 Difference]: Without dead ends: 107 [2021-10-13 00:31:23,108 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 74.4ms TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:31:23,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-13 00:31:23,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-10-13 00:31:23,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 60 states have (on average 1.65) internal successors, (99), 94 states have internal predecessors, (99), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:23,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 112 transitions. [2021-10-13 00:31:23,112 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 112 transitions. Word has length 36 [2021-10-13 00:31:23,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:23,112 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 112 transitions. [2021-10-13 00:31:23,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:23,113 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 112 transitions. [2021-10-13 00:31:23,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-13 00:31:23,113 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:23,113 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:23,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-13 00:31:23,114 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:23,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:23,114 INFO L82 PathProgramCache]: Analyzing trace with hash 995749166, now seen corresponding path program 1 times [2021-10-13 00:31:23,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:23,114 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941851297] [2021-10-13 00:31:23,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:23,114 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:23,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:23,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:23,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:23,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,252 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:23,252 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:23,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941851297] [2021-10-13 00:31:23,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941851297] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:23,252 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:23,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-10-13 00:31:23,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188606141] [2021-10-13 00:31:23,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:31:23,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:23,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:31:23,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:31:23,254 INFO L87 Difference]: Start difference. First operand 106 states and 112 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:23,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:23,622 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2021-10-13 00:31:23,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:31:23,623 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-10-13 00:31:23,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:23,624 INFO L225 Difference]: With dead ends: 105 [2021-10-13 00:31:23,624 INFO L226 Difference]: Without dead ends: 105 [2021-10-13 00:31:23,624 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:31:23,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-10-13 00:31:23,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2021-10-13 00:31:23,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 60 states have (on average 1.6333333333333333) internal successors, (98), 93 states have internal predecessors, (98), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:23,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 111 transitions. [2021-10-13 00:31:23,628 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 111 transitions. Word has length 36 [2021-10-13 00:31:23,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:23,629 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 111 transitions. [2021-10-13 00:31:23,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:31:23,629 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 111 transitions. [2021-10-13 00:31:23,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-10-13 00:31:23,630 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:23,630 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:23,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-13 00:31:23,630 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:23,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:23,631 INFO L82 PathProgramCache]: Analyzing trace with hash 488655642, now seen corresponding path program 1 times [2021-10-13 00:31:23,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:23,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747587043] [2021-10-13 00:31:23,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:23,632 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:23,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:23,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:23,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:23,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:23,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:23,751 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:31:23,751 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:23,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747587043] [2021-10-13 00:31:23,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747587043] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:23,752 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:23,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-13 00:31:23,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956259722] [2021-10-13 00:31:23,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:31:23,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:23,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:31:23,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:31:23,753 INFO L87 Difference]: Start difference. First operand 105 states and 111 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:23,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:23,941 INFO L93 Difference]: Finished difference Result 108 states and 115 transitions. [2021-10-13 00:31:23,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 00:31:23,942 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 42 [2021-10-13 00:31:23,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:23,943 INFO L225 Difference]: With dead ends: 108 [2021-10-13 00:31:23,943 INFO L226 Difference]: Without dead ends: 108 [2021-10-13 00:31:23,944 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 40.1ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:31:23,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-10-13 00:31:23,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-10-13 00:31:23,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 61 states have (on average 1.6229508196721312) internal successors, (99), 94 states have internal predecessors, (99), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:23,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 112 transitions. [2021-10-13 00:31:23,951 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 112 transitions. Word has length 42 [2021-10-13 00:31:23,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:23,951 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 112 transitions. [2021-10-13 00:31:23,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:23,951 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 112 transitions. [2021-10-13 00:31:23,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:31:23,952 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:23,953 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:23,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-10-13 00:31:23,953 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_remove_lastErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:23,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:23,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1446774504, now seen corresponding path program 1 times [2021-10-13 00:31:23,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:23,954 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104068505] [2021-10-13 00:31:23,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:23,954 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:23,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:24,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:24,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:24,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:24,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,412 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:31:24,412 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:24,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104068505] [2021-10-13 00:31:24,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104068505] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:24,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712428250] [2021-10-13 00:31:24,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:24,413 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:24,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:24,415 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:24,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-13 00:31:24,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:24,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 28 conjunts are in the unsatisfiable core [2021-10-13 00:31:24,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:24,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:24,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 9 treesize of output 7 [2021-10-13 00:31:25,198 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-10-13 00:31:25,199 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 2 case distinctions, treesize of input 25 treesize of output 24 [2021-10-13 00:31:25,360 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:25,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712428250] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:25,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:25,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2021-10-13 00:31:25,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957068742] [2021-10-13 00:31:25,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-13 00:31:25,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:25,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-13 00:31:25,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2021-10-13 00:31:25,363 INFO L87 Difference]: Start difference. First operand 106 states and 112 transitions. Second operand has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:31:26,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:26,859 INFO L93 Difference]: Finished difference Result 140 states and 149 transitions. [2021-10-13 00:31:26,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:31:26,860 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 44 [2021-10-13 00:31:26,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:26,861 INFO L225 Difference]: With dead ends: 140 [2021-10-13 00:31:26,861 INFO L226 Difference]: Without dead ends: 140 [2021-10-13 00:31:26,862 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 683.2ms TimeCoverageRelationStatistics Valid=179, Invalid=1011, Unknown=0, NotChecked=0, Total=1190 [2021-10-13 00:31:26,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-10-13 00:31:26,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 112. [2021-10-13 00:31:26,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 68 states have (on average 1.5294117647058822) internal successors, (104), 98 states have internal predecessors, (104), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-10-13 00:31:26,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2021-10-13 00:31:26,867 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 44 [2021-10-13 00:31:26,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:26,867 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2021-10-13 00:31:26,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:31:26,867 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2021-10-13 00:31:26,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:31:26,868 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:26,868 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:26,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-10-13 00:31:27,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:27,086 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_circular_remove_lastErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:27,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:27,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1446774505, now seen corresponding path program 1 times [2021-10-13 00:31:27,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:27,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974578678] [2021-10-13 00:31:27,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:27,086 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:27,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:27,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:27,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,383 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:27,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:27,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,547 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:27,548 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:27,548 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974578678] [2021-10-13 00:31:27,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974578678] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:27,548 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244297567] [2021-10-13 00:31:27,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:27,549 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:27,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:27,551 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:27,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 00:31:27,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:27,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 43 conjunts are in the unsatisfiable core [2021-10-13 00:31:27,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:27,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:27,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 9 treesize of output 7 [2021-10-13 00:31:27,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:31:28,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 9 treesize of output 7 [2021-10-13 00:31:28,235 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:31:28,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-10-13 00:31:28,583 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-10-13 00:31:28,583 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 2 case distinctions, treesize of input 24 treesize of output 32 [2021-10-13 00:31:29,109 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:31:29,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244297567] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:29,109 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:29,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 26 [2021-10-13 00:31:29,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519578323] [2021-10-13 00:31:29,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-13 00:31:29,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:29,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-13 00:31:29,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-10-13 00:31:29,111 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:31:31,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:31,221 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2021-10-13 00:31:31,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-13 00:31:31,222 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 44 [2021-10-13 00:31:31,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:31,223 INFO L225 Difference]: With dead ends: 171 [2021-10-13 00:31:31,223 INFO L226 Difference]: Without dead ends: 171 [2021-10-13 00:31:31,224 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1001.5ms TimeCoverageRelationStatistics Valid=233, Invalid=1407, Unknown=0, NotChecked=0, Total=1640 [2021-10-13 00:31:31,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-10-13 00:31:31,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 149. [2021-10-13 00:31:31,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 101 states have (on average 1.5445544554455446) internal successors, (156), 132 states have internal predecessors, (156), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-10-13 00:31:31,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 176 transitions. [2021-10-13 00:31:31,231 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 176 transitions. Word has length 44 [2021-10-13 00:31:31,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:31,231 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 176 transitions. [2021-10-13 00:31:31,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:31:31,231 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 176 transitions. [2021-10-13 00:31:31,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-13 00:31:31,232 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:31,232 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:31,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:31,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-13 00:31:31,439 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_circular_remove_lastErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:31,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:31,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1900336740, now seen corresponding path program 1 times [2021-10-13 00:31:31,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:31,440 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297061382] [2021-10-13 00:31:31,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:31,440 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:31,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:31,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:31,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:31,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:31,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:31,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:31,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:31,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:31,646 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:31:31,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:31,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297061382] [2021-10-13 00:31:31,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297061382] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:31,647 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:31,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:31:31,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070181946] [2021-10-13 00:31:31,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:31,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:31,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:31,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:31,648 INFO L87 Difference]: Start difference. First operand 149 states and 176 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:32,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:32,356 INFO L93 Difference]: Finished difference Result 192 states and 231 transitions. [2021-10-13 00:31:32,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-13 00:31:32,357 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 45 [2021-10-13 00:31:32,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:32,358 INFO L225 Difference]: With dead ends: 192 [2021-10-13 00:31:32,358 INFO L226 Difference]: Without dead ends: 192 [2021-10-13 00:31:32,359 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 272.6ms TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-10-13 00:31:32,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-10-13 00:31:32,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 154. [2021-10-13 00:31:32,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 105 states have (on average 1.561904761904762) internal successors, (164), 136 states have internal predecessors, (164), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (11), 8 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 00:31:32,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 186 transitions. [2021-10-13 00:31:32,368 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 186 transitions. Word has length 45 [2021-10-13 00:31:32,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:32,369 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 186 transitions. [2021-10-13 00:31:32,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:32,369 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 186 transitions. [2021-10-13 00:31:32,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-13 00:31:32,370 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:32,370 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:32,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-10-13 00:31:32,370 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_circular_remove_lastErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:32,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:32,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1900336741, now seen corresponding path program 1 times [2021-10-13 00:31:32,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:32,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254982578] [2021-10-13 00:31:32,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:32,371 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:32,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:32,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:32,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:32,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:32,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:32,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:32,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:32,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:32,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:32,637 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:32,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254982578] [2021-10-13 00:31:32,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254982578] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:32,637 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:32,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:31:32,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621661151] [2021-10-13 00:31:32,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:32,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:32,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:32,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:32,639 INFO L87 Difference]: Start difference. First operand 154 states and 186 transitions. Second operand has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:33,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:33,353 INFO L93 Difference]: Finished difference Result 202 states and 244 transitions. [2021-10-13 00:31:33,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-13 00:31:33,354 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 45 [2021-10-13 00:31:33,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:33,355 INFO L225 Difference]: With dead ends: 202 [2021-10-13 00:31:33,355 INFO L226 Difference]: Without dead ends: 202 [2021-10-13 00:31:33,356 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 313.6ms TimeCoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-10-13 00:31:33,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-10-13 00:31:33,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 154. [2021-10-13 00:31:33,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 105 states have (on average 1.542857142857143) internal successors, (162), 136 states have internal predecessors, (162), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (11), 8 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 00:31:33,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 184 transitions. [2021-10-13 00:31:33,363 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 184 transitions. Word has length 45 [2021-10-13 00:31:33,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:33,363 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 184 transitions. [2021-10-13 00:31:33,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:33,364 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 184 transitions. [2021-10-13 00:31:33,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 00:31:33,364 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:33,364 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:31:33,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-10-13 00:31:33,365 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:33,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1263372187, now seen corresponding path program 1 times [2021-10-13 00:31:33,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:33,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382085152] [2021-10-13 00:31:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:33,365 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:33,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-10-13 00:31:33,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-10-13 00:31:33,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-10-13 00:31:33,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,466 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-10-13 00:31:33,466 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:33,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382085152] [2021-10-13 00:31:33,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382085152] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:33,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619056303] [2021-10-13 00:31:33,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:33,467 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:33,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:33,468 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:33,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-13 00:31:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:33,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:31:33,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:33,983 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:33,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619056303] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:33,983 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:31:33,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-10-13 00:31:33,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779467123] [2021-10-13 00:31:33,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:31:33,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:33,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:31:33,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:31:33,985 INFO L87 Difference]: Start difference. First operand 154 states and 184 transitions. Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-13 00:31:34,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:34,018 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2021-10-13 00:31:34,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:31:34,019 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 47 [2021-10-13 00:31:34,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:34,020 INFO L225 Difference]: With dead ends: 96 [2021-10-13 00:31:34,020 INFO L226 Difference]: Without dead ends: 96 [2021-10-13 00:31:34,022 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 68.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:31:34,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-10-13 00:31:34,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-10-13 00:31:34,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 64 states have (on average 1.328125) internal successors, (85), 83 states have internal predecessors, (85), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:34,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2021-10-13 00:31:34,033 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 47 [2021-10-13 00:31:34,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:34,033 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2021-10-13 00:31:34,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-13 00:31:34,033 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2021-10-13 00:31:34,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-10-13 00:31:34,034 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:34,034 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:34,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-10-13 00:31:34,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-13 00:31:34,234 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_circular_remove_lastErr13REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:34,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:34,235 INFO L82 PathProgramCache]: Analyzing trace with hash -57661850, now seen corresponding path program 1 times [2021-10-13 00:31:34,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:34,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601485792] [2021-10-13 00:31:34,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:34,235 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:34,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:34,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:34,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:34,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:34,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:34,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:34,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:34,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:34,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:34,617 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:34,620 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:34,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601485792] [2021-10-13 00:31:34,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601485792] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:34,620 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:34,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-10-13 00:31:34,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100821091] [2021-10-13 00:31:34,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-13 00:31:34,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:34,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-13 00:31:34,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:31:34,624 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:35,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:35,410 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2021-10-13 00:31:35,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-13 00:31:35,411 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 49 [2021-10-13 00:31:35,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:35,412 INFO L225 Difference]: With dead ends: 113 [2021-10-13 00:31:35,412 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 00:31:35,412 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 489.5ms TimeCoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-10-13 00:31:35,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 00:31:35,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-10-13 00:31:35,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 68 states have (on average 1.3235294117647058) internal successors, (90), 86 states have internal predecessors, (90), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:35,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2021-10-13 00:31:35,417 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 49 [2021-10-13 00:31:35,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:35,417 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2021-10-13 00:31:35,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:35,418 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2021-10-13 00:31:35,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-10-13 00:31:35,418 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:35,418 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:35,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-10-13 00:31:35,419 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_circular_remove_lastErr14REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:35,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:35,419 INFO L82 PathProgramCache]: Analyzing trace with hash -57661849, now seen corresponding path program 1 times [2021-10-13 00:31:35,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:35,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399643935] [2021-10-13 00:31:35,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:35,420 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:35,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:35,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:35,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:35,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:35,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:35,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:35,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:35,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:35,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:36,028 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:36,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:36,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399643935] [2021-10-13 00:31:36,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399643935] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:36,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330327128] [2021-10-13 00:31:36,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:36,029 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:36,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:36,030 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:36,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-13 00:31:36,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:36,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 75 conjunts are in the unsatisfiable core [2021-10-13 00:31:36,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:36,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-10-13 00:31:36,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:31:37,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:31:37,254 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:31:37,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 35 [2021-10-13 00:31:37,409 INFO L354 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2021-10-13 00:31:37,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 18 [2021-10-13 00:31:37,449 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:37,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330327128] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:37,450 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:37,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 41 [2021-10-13 00:31:37,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133123060] [2021-10-13 00:31:37,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-10-13 00:31:37,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:37,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-10-13 00:31:37,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1620, Unknown=0, NotChecked=0, Total=1722 [2021-10-13 00:31:37,452 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand has 42 states, 40 states have (on average 1.75) internal successors, (70), 32 states have internal predecessors, (70), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:31:39,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:39,390 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2021-10-13 00:31:39,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-13 00:31:39,391 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.75) internal successors, (70), 32 states have internal predecessors, (70), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 49 [2021-10-13 00:31:39,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:39,392 INFO L225 Difference]: With dead ends: 128 [2021-10-13 00:31:39,392 INFO L226 Difference]: Without dead ends: 128 [2021-10-13 00:31:39,394 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 2017.7ms TimeCoverageRelationStatistics Valid=255, Invalid=3167, Unknown=0, NotChecked=0, Total=3422 [2021-10-13 00:31:39,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-10-13 00:31:39,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-10-13 00:31:39,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 84 states have (on average 1.369047619047619) internal successors, (115), 103 states have internal predecessors, (115), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:31:39,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 128 transitions. [2021-10-13 00:31:39,399 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 128 transitions. Word has length 49 [2021-10-13 00:31:39,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:39,399 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 128 transitions. [2021-10-13 00:31:39,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.75) internal successors, (70), 32 states have internal predecessors, (70), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:31:39,399 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 128 transitions. [2021-10-13 00:31:39,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-13 00:31:39,400 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:39,400 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:39,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:39,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:39,615 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_circular_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:39,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:39,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1787531150, now seen corresponding path program 1 times [2021-10-13 00:31:39,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:39,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944312404] [2021-10-13 00:31:39,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:39,616 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:39,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:39,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:39,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:39,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:39,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:39,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:39,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:39,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:39,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:39,822 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:39,822 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:39,823 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944312404] [2021-10-13 00:31:39,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944312404] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:39,823 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:39,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:31:39,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021404755] [2021-10-13 00:31:39,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:39,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:39,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:39,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:39,825 INFO L87 Difference]: Start difference. First operand 116 states and 128 transitions. Second operand has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:40,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:40,353 INFO L93 Difference]: Finished difference Result 161 states and 175 transitions. [2021-10-13 00:31:40,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-13 00:31:40,354 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 50 [2021-10-13 00:31:40,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:40,355 INFO L225 Difference]: With dead ends: 161 [2021-10-13 00:31:40,355 INFO L226 Difference]: Without dead ends: 161 [2021-10-13 00:31:40,356 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 252.5ms TimeCoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-10-13 00:31:40,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-10-13 00:31:40,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 136. [2021-10-13 00:31:40,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 100 states have (on average 1.38) internal successors, (138), 121 states have internal predecessors, (138), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:40,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 156 transitions. [2021-10-13 00:31:40,362 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 156 transitions. Word has length 50 [2021-10-13 00:31:40,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:40,362 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 156 transitions. [2021-10-13 00:31:40,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:40,363 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 156 transitions. [2021-10-13 00:31:40,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-10-13 00:31:40,363 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:40,363 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:40,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-10-13 00:31:40,364 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_circular_remove_lastErr9ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:40,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:40,364 INFO L82 PathProgramCache]: Analyzing trace with hash 421109350, now seen corresponding path program 1 times [2021-10-13 00:31:40,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:40,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302668195] [2021-10-13 00:31:40,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:40,365 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:40,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:40,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:40,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:40,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:40,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:40,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:40,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:40,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:40,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:40,598 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:40,599 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:40,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302668195] [2021-10-13 00:31:40,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302668195] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:40,599 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:40,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:31:40,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428109119] [2021-10-13 00:31:40,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:40,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:40,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:40,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:40,603 INFO L87 Difference]: Start difference. First operand 136 states and 156 transitions. Second operand has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:41,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:41,265 INFO L93 Difference]: Finished difference Result 142 states and 155 transitions. [2021-10-13 00:31:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:31:41,266 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 51 [2021-10-13 00:31:41,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:41,267 INFO L225 Difference]: With dead ends: 142 [2021-10-13 00:31:41,267 INFO L226 Difference]: Without dead ends: 142 [2021-10-13 00:31:41,268 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 311.1ms TimeCoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-10-13 00:31:41,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-13 00:31:41,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 136. [2021-10-13 00:31:41,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 100 states have (on average 1.37) internal successors, (137), 121 states have internal predecessors, (137), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:41,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 155 transitions. [2021-10-13 00:31:41,273 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 155 transitions. Word has length 51 [2021-10-13 00:31:41,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:41,274 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 155 transitions. [2021-10-13 00:31:41,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:41,274 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 155 transitions. [2021-10-13 00:31:41,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-10-13 00:31:41,274 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:41,275 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:41,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-10-13 00:31:41,275 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_circular_remove_lastErr16ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:41,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:41,276 INFO L82 PathProgramCache]: Analyzing trace with hash 182847393, now seen corresponding path program 1 times [2021-10-13 00:31:41,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:41,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926770310] [2021-10-13 00:31:41,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:41,277 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:41,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:41,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:41,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:41,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:41,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:41,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:41,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:41,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:41,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:41,737 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:41,737 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:41,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926770310] [2021-10-13 00:31:41,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926770310] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:41,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238928266] [2021-10-13 00:31:41,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:41,738 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:41,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:41,739 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:41,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 00:31:42,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:42,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 47 conjunts are in the unsatisfiable core [2021-10-13 00:31:42,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:42,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-10-13 00:31:42,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 34 treesize of output 26 [2021-10-13 00:31:42,561 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:31:42,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 26 [2021-10-13 00:31:42,592 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 00:31:42,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238928266] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:42,592 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:42,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15] total 29 [2021-10-13 00:31:42,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316990563] [2021-10-13 00:31:42,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-10-13 00:31:42,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:42,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-10-13 00:31:42,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=806, Unknown=0, NotChecked=0, Total=870 [2021-10-13 00:31:42,595 INFO L87 Difference]: Start difference. First operand 136 states and 155 transitions. Second operand has 30 states, 28 states have (on average 2.4285714285714284) internal successors, (68), 22 states have internal predecessors, (68), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:31:44,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:44,067 INFO L93 Difference]: Finished difference Result 141 states and 154 transitions. [2021-10-13 00:31:44,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-13 00:31:44,067 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 2.4285714285714284) internal successors, (68), 22 states have internal predecessors, (68), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 52 [2021-10-13 00:31:44,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:44,068 INFO L225 Difference]: With dead ends: 141 [2021-10-13 00:31:44,068 INFO L226 Difference]: Without dead ends: 141 [2021-10-13 00:31:44,069 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1274.5ms TimeCoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2021-10-13 00:31:44,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-10-13 00:31:44,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 136. [2021-10-13 00:31:44,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 100 states have (on average 1.36) internal successors, (136), 121 states have internal predecessors, (136), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:44,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 154 transitions. [2021-10-13 00:31:44,075 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 154 transitions. Word has length 52 [2021-10-13 00:31:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:44,075 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 154 transitions. [2021-10-13 00:31:44,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 2.4285714285714284) internal successors, (68), 22 states have internal predecessors, (68), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 00:31:44,076 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 154 transitions. [2021-10-13 00:31:44,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-10-13 00:31:44,076 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:44,077 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:44,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:44,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-10-13 00:31:44,291 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_circular_remove_lastErr10ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:44,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:44,292 INFO L82 PathProgramCache]: Analyzing trace with hash 169488116, now seen corresponding path program 1 times [2021-10-13 00:31:44,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:44,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051947359] [2021-10-13 00:31:44,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:44,292 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:44,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:44,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:44,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:44,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:44,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,394 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:31:44,394 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:44,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051947359] [2021-10-13 00:31:44,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051947359] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:44,395 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:44,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-13 00:31:44,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650072781] [2021-10-13 00:31:44,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:31:44,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:44,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:31:44,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:31:44,396 INFO L87 Difference]: Start difference. First operand 136 states and 154 transitions. Second operand has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:44,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:44,663 INFO L93 Difference]: Finished difference Result 135 states and 151 transitions. [2021-10-13 00:31:44,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:31:44,664 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 52 [2021-10-13 00:31:44,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:44,665 INFO L225 Difference]: With dead ends: 135 [2021-10-13 00:31:44,665 INFO L226 Difference]: Without dead ends: 135 [2021-10-13 00:31:44,665 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 129.5ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:31:44,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-10-13 00:31:44,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-10-13 00:31:44,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 100 states have (on average 1.33) internal successors, (133), 120 states have internal predecessors, (133), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:44,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 151 transitions. [2021-10-13 00:31:44,671 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 151 transitions. Word has length 52 [2021-10-13 00:31:44,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:44,671 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 151 transitions. [2021-10-13 00:31:44,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:44,672 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 151 transitions. [2021-10-13 00:31:44,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-10-13 00:31:44,672 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:44,673 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:44,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-10-13 00:31:44,673 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_circular_remove_lastErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:44,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:44,673 INFO L82 PathProgramCache]: Analyzing trace with hash 959164457, now seen corresponding path program 1 times [2021-10-13 00:31:44,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:44,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120095467] [2021-10-13 00:31:44,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:44,674 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:44,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:44,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:44,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:44,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:44,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:44,925 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:44,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:44,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120095467] [2021-10-13 00:31:44,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120095467] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:44,926 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:44,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-10-13 00:31:44,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787666856] [2021-10-13 00:31:44,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 00:31:44,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:44,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 00:31:44,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=270, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:31:44,928 INFO L87 Difference]: Start difference. First operand 135 states and 151 transitions. Second operand has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:45,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:45,572 INFO L93 Difference]: Finished difference Result 138 states and 150 transitions. [2021-10-13 00:31:45,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-13 00:31:45,588 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-10-13 00:31:45,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:45,590 INFO L225 Difference]: With dead ends: 138 [2021-10-13 00:31:45,590 INFO L226 Difference]: Without dead ends: 138 [2021-10-13 00:31:45,591 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 373.4ms TimeCoverageRelationStatistics Valid=124, Invalid=806, Unknown=0, NotChecked=0, Total=930 [2021-10-13 00:31:45,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-10-13 00:31:45,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 135. [2021-10-13 00:31:45,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 100 states have (on average 1.32) internal successors, (132), 120 states have internal predecessors, (132), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:45,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 150 transitions. [2021-10-13 00:31:45,597 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 150 transitions. Word has length 53 [2021-10-13 00:31:45,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:45,597 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 150 transitions. [2021-10-13 00:31:45,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:45,597 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 150 transitions. [2021-10-13 00:31:45,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-13 00:31:45,598 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:45,598 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:45,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-10-13 00:31:45,599 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting dll_circular_remove_lastErr18REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:45,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:45,599 INFO L82 PathProgramCache]: Analyzing trace with hash -377309052, now seen corresponding path program 1 times [2021-10-13 00:31:45,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:45,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78341695] [2021-10-13 00:31:45,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:45,600 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:45,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:45,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:45,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:45,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:45,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:45,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:45,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:45,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:45,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:45,758 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:31:45,759 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:45,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78341695] [2021-10-13 00:31:45,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78341695] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:45,759 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:45,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-10-13 00:31:45,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13554309] [2021-10-13 00:31:45,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-13 00:31:45,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:45,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-13 00:31:45,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:31:45,761 INFO L87 Difference]: Start difference. First operand 135 states and 150 transitions. Second operand has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:46,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:46,107 INFO L93 Difference]: Finished difference Result 134 states and 148 transitions. [2021-10-13 00:31:46,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 00:31:46,107 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 54 [2021-10-13 00:31:46,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:46,108 INFO L225 Difference]: With dead ends: 134 [2021-10-13 00:31:46,108 INFO L226 Difference]: Without dead ends: 134 [2021-10-13 00:31:46,109 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 216.8ms TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:31:46,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-10-13 00:31:46,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-10-13 00:31:46,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 100 states have (on average 1.3) internal successors, (130), 119 states have internal predecessors, (130), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:46,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 148 transitions. [2021-10-13 00:31:46,114 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 148 transitions. Word has length 54 [2021-10-13 00:31:46,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:46,114 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 148 transitions. [2021-10-13 00:31:46,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:31:46,115 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 148 transitions. [2021-10-13 00:31:46,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-10-13 00:31:46,115 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:46,115 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:46,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-10-13 00:31:46,116 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_circular_remove_lastErr20REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:46,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:46,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1188321389, now seen corresponding path program 1 times [2021-10-13 00:31:46,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:46,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813958958] [2021-10-13 00:31:46,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:46,117 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:46,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:46,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:46,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:46,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:46,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:46,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:46,510 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:46,510 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:46,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813958958] [2021-10-13 00:31:46,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813958958] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:46,511 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:46,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-10-13 00:31:46,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945247008] [2021-10-13 00:31:46,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-10-13 00:31:46,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:46,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-10-13 00:31:46,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=415, Unknown=0, NotChecked=0, Total=462 [2021-10-13 00:31:46,513 INFO L87 Difference]: Start difference. First operand 134 states and 148 transitions. Second operand has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 17 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:47,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:47,803 INFO L93 Difference]: Finished difference Result 156 states and 164 transitions. [2021-10-13 00:31:47,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-13 00:31:47,804 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 17 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 55 [2021-10-13 00:31:47,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:47,805 INFO L225 Difference]: With dead ends: 156 [2021-10-13 00:31:47,805 INFO L226 Difference]: Without dead ends: 156 [2021-10-13 00:31:47,806 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 886.8ms TimeCoverageRelationStatistics Valid=221, Invalid=1261, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:31:47,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-10-13 00:31:47,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 141. [2021-10-13 00:31:47,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 107 states have (on average 1.3177570093457944) internal successors, (141), 126 states have internal predecessors, (141), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:47,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 159 transitions. [2021-10-13 00:31:47,811 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 159 transitions. Word has length 55 [2021-10-13 00:31:47,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:47,812 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 159 transitions. [2021-10-13 00:31:47,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.142857142857143) internal successors, (45), 17 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:47,812 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 159 transitions. [2021-10-13 00:31:47,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-10-13 00:31:47,813 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:47,813 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:47,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-10-13 00:31:47,814 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_circular_remove_lastErr21REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:47,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:47,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1188321390, now seen corresponding path program 1 times [2021-10-13 00:31:47,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:47,814 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704887953] [2021-10-13 00:31:47,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:47,815 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:47,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:47,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:47,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:47,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:47,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:48,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:48,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:48,049 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:48,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:48,115 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:48,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:48,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704887953] [2021-10-13 00:31:48,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704887953] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:31:48,116 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:31:48,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:31:48,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709699042] [2021-10-13 00:31:48,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:31:48,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:48,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:31:48,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:31:48,118 INFO L87 Difference]: Start difference. First operand 141 states and 159 transitions. Second operand has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 10 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:48,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:48,731 INFO L93 Difference]: Finished difference Result 141 states and 158 transitions. [2021-10-13 00:31:48,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 00:31:48,731 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 10 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 55 [2021-10-13 00:31:48,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:48,732 INFO L225 Difference]: With dead ends: 141 [2021-10-13 00:31:48,732 INFO L226 Difference]: Without dead ends: 141 [2021-10-13 00:31:48,732 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 338.3ms TimeCoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-10-13 00:31:48,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-10-13 00:31:48,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-10-13 00:31:48,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 107 states have (on average 1.308411214953271) internal successors, (140), 126 states have internal predecessors, (140), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:48,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 158 transitions. [2021-10-13 00:31:48,737 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 158 transitions. Word has length 55 [2021-10-13 00:31:48,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:48,738 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 158 transitions. [2021-10-13 00:31:48,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 10 states have internal predecessors, (45), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:31:48,738 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 158 transitions. [2021-10-13 00:31:48,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:31:48,739 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:48,739 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:48,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-10-13 00:31:48,740 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting dll_circular_remove_lastErr24REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:48,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:48,740 INFO L82 PathProgramCache]: Analyzing trace with hash -2132806006, now seen corresponding path program 1 times [2021-10-13 00:31:48,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:48,740 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575530680] [2021-10-13 00:31:48,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:48,741 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:48,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:49,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:49,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:49,095 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:31:49,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:49,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:31:49,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:49,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:31:49,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:49,696 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:31:49,696 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:31:49,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575530680] [2021-10-13 00:31:49,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575530680] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:49,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998772301] [2021-10-13 00:31:49,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:49,696 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:31:49,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:31:49,699 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:31:49,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-13 00:31:50,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:50,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 83 conjunts are in the unsatisfiable core [2021-10-13 00:31:50,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:31:50,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:31:50,752 INFO L354 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2021-10-13 00:31:50,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-10-13 00:31:50,852 INFO L354 Elim1Store]: treesize reduction 72, result has 19.1 percent of original size [2021-10-13 00:31:50,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 38 [2021-10-13 00:31:51,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 97 treesize of output 73 [2021-10-13 00:31:53,397 INFO L354 Elim1Store]: treesize reduction 110, result has 2.7 percent of original size [2021-10-13 00:31:53,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 99 treesize of output 38 [2021-10-13 00:31:53,412 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:31:53,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998772301] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:31:53,412 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:31:53,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 27] total 54 [2021-10-13 00:31:53,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298361702] [2021-10-13 00:31:53,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-10-13 00:31:53,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:31:53,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-10-13 00:31:53,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2823, Unknown=0, NotChecked=0, Total=2970 [2021-10-13 00:31:53,415 INFO L87 Difference]: Start difference. First operand 141 states and 158 transitions. Second operand has 55 states, 53 states have (on average 1.5660377358490567) internal successors, (83), 45 states have internal predecessors, (83), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:31:59,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:31:59,352 INFO L93 Difference]: Finished difference Result 142 states and 157 transitions. [2021-10-13 00:31:59,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-10-13 00:31:59,353 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 53 states have (on average 1.5660377358490567) internal successors, (83), 45 states have internal predecessors, (83), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 58 [2021-10-13 00:31:59,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:31:59,354 INFO L225 Difference]: With dead ends: 142 [2021-10-13 00:31:59,354 INFO L226 Difference]: Without dead ends: 142 [2021-10-13 00:31:59,356 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 4612.4ms TimeCoverageRelationStatistics Valid=469, Invalid=6173, Unknown=0, NotChecked=0, Total=6642 [2021-10-13 00:31:59,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-13 00:31:59,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-10-13 00:31:59,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 107 states have (on average 1.2990654205607477) internal successors, (139), 126 states have internal predecessors, (139), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:31:59,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 157 transitions. [2021-10-13 00:31:59,362 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 157 transitions. Word has length 58 [2021-10-13 00:31:59,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:31:59,362 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 157 transitions. [2021-10-13 00:31:59,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 53 states have (on average 1.5660377358490567) internal successors, (83), 45 states have internal predecessors, (83), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:31:59,362 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 157 transitions. [2021-10-13 00:31:59,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:31:59,363 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:31:59,363 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:31:59,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-13 00:31:59,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-10-13 00:31:59,564 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_circular_remove_lastErr25REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:31:59,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:31:59,564 INFO L82 PathProgramCache]: Analyzing trace with hash -2132806005, now seen corresponding path program 1 times [2021-10-13 00:31:59,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:31:59,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089782108] [2021-10-13 00:31:59,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:31:59,565 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:31:59,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:59,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:31:59,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:31:59,996 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:32:00,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:00,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:32:00,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:00,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:32:00,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:00,545 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:32:00,545 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:32:00,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089782108] [2021-10-13 00:32:00,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089782108] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:00,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457482902] [2021-10-13 00:32:00,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:00,546 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:00,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:32:00,551 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:32:00,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 00:32:01,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:01,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 90 conjunts are in the unsatisfiable core [2021-10-13 00:32:01,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:32:01,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:32:01,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-10-13 00:32:01,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-10-13 00:32:01,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:32:01,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:32:01,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:32:01,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:32:01,699 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 00:32:01,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 55 treesize of output 57 [2021-10-13 00:32:01,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:32:01,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:32:01,711 INFO L354 Elim1Store]: treesize reduction 35, result has 27.1 percent of original size [2021-10-13 00:32:01,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 66 treesize of output 68 [2021-10-13 00:32:03,420 INFO L354 Elim1Store]: treesize reduction 112, result has 5.9 percent of original size [2021-10-13 00:32:03,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 9 new quantified variables, introduced 15 case distinctions, treesize of input 167 treesize of output 72 [2021-10-13 00:32:03,555 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-10-13 00:32:03,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 33 treesize of output 17 [2021-10-13 00:32:03,573 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:32:03,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457482902] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:03,573 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:32:03,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 54 [2021-10-13 00:32:03,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842936006] [2021-10-13 00:32:03,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-10-13 00:32:03,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:32:03,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-10-13 00:32:03,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2800, Unknown=0, NotChecked=0, Total=2970 [2021-10-13 00:32:03,576 INFO L87 Difference]: Start difference. First operand 141 states and 157 transitions. Second operand has 55 states, 53 states have (on average 1.7169811320754718) internal successors, (91), 45 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:32:07,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:32:07,072 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2021-10-13 00:32:07,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-10-13 00:32:07,072 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 53 states have (on average 1.7169811320754718) internal successors, (91), 45 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 58 [2021-10-13 00:32:07,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:32:07,073 INFO L225 Difference]: With dead ends: 141 [2021-10-13 00:32:07,073 INFO L226 Difference]: Without dead ends: 141 [2021-10-13 00:32:07,075 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 4361.2ms TimeCoverageRelationStatistics Valid=493, Invalid=5827, Unknown=0, NotChecked=0, Total=6320 [2021-10-13 00:32:07,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-10-13 00:32:07,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-10-13 00:32:07,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 107 states have (on average 1.2897196261682242) internal successors, (138), 126 states have internal predecessors, (138), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:32:07,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 156 transitions. [2021-10-13 00:32:07,080 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 156 transitions. Word has length 58 [2021-10-13 00:32:07,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:32:07,080 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 156 transitions. [2021-10-13 00:32:07,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 53 states have (on average 1.7169811320754718) internal successors, (91), 45 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-13 00:32:07,081 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 156 transitions. [2021-10-13 00:32:07,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:32:07,082 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:32:07,082 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:32:07,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-13 00:32:07,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:07,295 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:32:07,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:32:07,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1807415305, now seen corresponding path program 1 times [2021-10-13 00:32:07,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:32:07,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442733203] [2021-10-13 00:32:07,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:07,296 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:32:07,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:32:07,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:32:07,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:32:07,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:32:07,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-10-13 00:32:07,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,421 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:32:07,421 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:32:07,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442733203] [2021-10-13 00:32:07,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442733203] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:32:07,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:32:07,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:32:07,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38025369] [2021-10-13 00:32:07,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:32:07,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:32:07,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:32:07,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:32:07,423 INFO L87 Difference]: Start difference. First operand 141 states and 156 transitions. Second operand has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-10-13 00:32:07,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:32:07,719 INFO L93 Difference]: Finished difference Result 139 states and 153 transitions. [2021-10-13 00:32:07,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:32:07,720 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 58 [2021-10-13 00:32:07,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:32:07,721 INFO L225 Difference]: With dead ends: 139 [2021-10-13 00:32:07,721 INFO L226 Difference]: Without dead ends: 139 [2021-10-13 00:32:07,721 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 124.4ms TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:32:07,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-10-13 00:32:07,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-10-13 00:32:07,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 107 states have (on average 1.2616822429906542) internal successors, (135), 124 states have internal predecessors, (135), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:32:07,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 153 transitions. [2021-10-13 00:32:07,726 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 153 transitions. Word has length 58 [2021-10-13 00:32:07,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:32:07,727 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 153 transitions. [2021-10-13 00:32:07,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-10-13 00:32:07,727 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 153 transitions. [2021-10-13 00:32:07,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-10-13 00:32:07,728 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:32:07,728 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:32:07,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-10-13 00:32:07,728 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:32:07,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:32:07,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1759322668, now seen corresponding path program 1 times [2021-10-13 00:32:07,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:32:07,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258497461] [2021-10-13 00:32:07,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:07,729 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:32:07,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,790 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:32:07,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:32:07,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:32:07,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:32:07,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-10-13 00:32:07,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:07,845 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:32:07,845 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:32:07,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258497461] [2021-10-13 00:32:07,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258497461] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:07,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437612941] [2021-10-13 00:32:07,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:07,846 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:07,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:32:07,847 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:32:07,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 00:32:08,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:08,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 00:32:08,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:32:08,707 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:32:08,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437612941] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:08,707 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:32:08,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-10-13 00:32:08,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667971106] [2021-10-13 00:32:08,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-13 00:32:08,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:32:08,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-13 00:32:08,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:32:08,709 INFO L87 Difference]: Start difference. First operand 139 states and 153 transitions. Second operand has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:32:08,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:32:08,925 INFO L93 Difference]: Finished difference Result 143 states and 157 transitions. [2021-10-13 00:32:08,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:32:08,926 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 60 [2021-10-13 00:32:08,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:32:08,927 INFO L225 Difference]: With dead ends: 143 [2021-10-13 00:32:08,927 INFO L226 Difference]: Without dead ends: 143 [2021-10-13 00:32:08,927 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 86.1ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:32:08,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-10-13 00:32:08,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-10-13 00:32:08,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 111 states have (on average 1.2522522522522523) internal successors, (139), 126 states have internal predecessors, (139), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-13 00:32:08,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 157 transitions. [2021-10-13 00:32:08,933 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 157 transitions. Word has length 60 [2021-10-13 00:32:08,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:32:08,934 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 157 transitions. [2021-10-13 00:32:08,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:32:08,934 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 157 transitions. [2021-10-13 00:32:08,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-10-13 00:32:08,936 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:32:08,937 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:32:08,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-13 00:32:09,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:09,137 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_circular_remove_lastErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:32:09,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:32:09,138 INFO L82 PathProgramCache]: Analyzing trace with hash -1291366635, now seen corresponding path program 1 times [2021-10-13 00:32:09,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:32:09,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110938258] [2021-10-13 00:32:09,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:09,138 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:32:09,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:32:09,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:32:09,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,331 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:32:09,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:32:09,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-10-13 00:32:09,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:09,835 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:32:09,835 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:32:09,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110938258] [2021-10-13 00:32:09,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110938258] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:09,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55094086] [2021-10-13 00:32:09,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:09,836 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:09,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:32:09,837 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:32:09,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-13 00:32:10,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:10,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 70 conjunts are in the unsatisfiable core [2021-10-13 00:32:10,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:32:10,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:32:10,770 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:32:10,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-10-13 00:32:10,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-10-13 00:32:11,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 29 treesize of output 21 [2021-10-13 00:32:11,283 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:32:11,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55094086] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:11,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:32:11,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 39 [2021-10-13 00:32:11,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757283307] [2021-10-13 00:32:11,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-13 00:32:11,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:32:11,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-13 00:32:11,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1380, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:32:11,286 INFO L87 Difference]: Start difference. First operand 143 states and 157 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 30 states have internal predecessors, (71), 6 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:32:12,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:32:12,630 INFO L93 Difference]: Finished difference Result 118 states and 119 transitions. [2021-10-13 00:32:12,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-10-13 00:32:12,633 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 30 states have internal predecessors, (71), 6 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 61 [2021-10-13 00:32:12,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:32:12,634 INFO L225 Difference]: With dead ends: 118 [2021-10-13 00:32:12,634 INFO L226 Difference]: Without dead ends: 111 [2021-10-13 00:32:12,636 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1487.7ms TimeCoverageRelationStatistics Valid=295, Invalid=3011, Unknown=0, NotChecked=0, Total=3306 [2021-10-13 00:32:12,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-10-13 00:32:12,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2021-10-13 00:32:12,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 81 states have (on average 1.1975308641975309) internal successors, (97), 95 states have internal predecessors, (97), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:32:12,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2021-10-13 00:32:12,640 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 61 [2021-10-13 00:32:12,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:32:12,640 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2021-10-13 00:32:12,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 30 states have internal predecessors, (71), 6 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:32:12,641 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2021-10-13 00:32:12,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-13 00:32:12,641 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:32:12,642 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:32:12,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-13 00:32:12,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:12,855 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting dll_circular_remove_lastErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:32:12,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:32:12,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1832717795, now seen corresponding path program 1 times [2021-10-13 00:32:12,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:32:12,856 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559207365] [2021-10-13 00:32:12,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:12,857 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:32:12,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:12,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:32:12,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:12,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:32:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:13,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:32:13,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:13,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:32:13,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:13,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-10-13 00:32:13,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:13,386 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:32:13,386 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:32:13,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559207365] [2021-10-13 00:32:13,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559207365] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:13,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953134983] [2021-10-13 00:32:13,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:32:13,387 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:32:13,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:32:13,388 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:32:13,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 00:32:14,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:32:14,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 101 conjunts are in the unsatisfiable core [2021-10-13 00:32:14,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:32:14,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-10-13 00:32:14,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:32:14,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:32:14,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:32:14,685 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 00:32:14,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 28 treesize of output 30 [2021-10-13 00:32:20,282 INFO L354 Elim1Store]: treesize reduction 507, result has 12.6 percent of original size [2021-10-13 00:32:20,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 22 case distinctions, treesize of input 205 treesize of output 119 [2021-10-13 00:32:20,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 113 treesize of output 97 [2021-10-13 00:32:20,682 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-10-13 00:32:20,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 56 treesize of output 24 [2021-10-13 00:32:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:32:20,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953134983] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:32:20,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:32:20,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 34] total 54 [2021-10-13 00:32:20,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582314714] [2021-10-13 00:32:20,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-10-13 00:32:20,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:32:20,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-10-13 00:32:20,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2819, Unknown=1, NotChecked=0, Total=2970 [2021-10-13 00:32:20,690 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand has 55 states, 52 states have (on average 2.076923076923077) internal successors, (108), 44 states have internal predecessors, (108), 8 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:33:21,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:33:21,503 INFO L93 Difference]: Finished difference Result 145 states and 152 transitions. [2021-10-13 00:33:21,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-10-13 00:33:21,503 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 52 states have (on average 2.076923076923077) internal successors, (108), 44 states have internal predecessors, (108), 8 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) Word has length 67 [2021-10-13 00:33:21,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:33:21,504 INFO L225 Difference]: With dead ends: 145 [2021-10-13 00:33:21,504 INFO L226 Difference]: Without dead ends: 145 [2021-10-13 00:33:21,508 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1893 ImplicationChecksByTransitivity, 39397.4ms TimeCoverageRelationStatistics Valid=734, Invalid=8367, Unknown=19, NotChecked=0, Total=9120 [2021-10-13 00:33:21,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-10-13 00:33:21,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 118. [2021-10-13 00:33:21,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 87 states have (on average 1.206896551724138) internal successors, (105), 102 states have internal predecessors, (105), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-10-13 00:33:21,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 125 transitions. [2021-10-13 00:33:21,512 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 125 transitions. Word has length 67 [2021-10-13 00:33:21,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:33:21,513 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 125 transitions. [2021-10-13 00:33:21,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 52 states have (on average 2.076923076923077) internal successors, (108), 44 states have internal predecessors, (108), 8 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:33:21,513 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 125 transitions. [2021-10-13 00:33:21,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-13 00:33:21,514 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:33:21,514 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:33:21,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 00:33:21,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-10-13 00:33:21,732 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_circular_remove_lastErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:33:21,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:33:21,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1832717794, now seen corresponding path program 1 times [2021-10-13 00:33:21,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:33:21,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456844592] [2021-10-13 00:33:21,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:33:21,733 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:33:21,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:21,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:33:21,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:21,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:33:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:22,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-13 00:33:22,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:22,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-10-13 00:33:22,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:22,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-10-13 00:33:22,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:22,588 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:33:22,588 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:33:22,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456844592] [2021-10-13 00:33:22,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456844592] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:33:22,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810169860] [2021-10-13 00:33:22,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:33:22,589 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:33:22,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:33:22,591 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:33:22,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-13 00:33:23,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:33:23,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 105 conjunts are in the unsatisfiable core [2021-10-13 00:33:23,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:33:23,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:33:23,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-10-13 00:33:23,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:33:23,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:33:23,924 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:33:23,930 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 00:33:23,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 28 treesize of output 30 [2021-10-13 00:33:24,234 INFO L354 Elim1Store]: treesize reduction 62, result has 1.6 percent of original size [2021-10-13 00:33:24,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 83 treesize of output 37 [2021-10-13 00:33:24,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 25 treesize of output 17 [2021-10-13 00:33:39,503 INFO L354 Elim1Store]: treesize reduction 335, result has 16.7 percent of original size [2021-10-13 00:33:39,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 11 case distinctions, treesize of input 316 treesize of output 157 [2021-10-13 00:33:39,531 INFO L354 Elim1Store]: treesize reduction 98, result has 21.6 percent of original size [2021-10-13 00:33:39,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 153 treesize of output 142 [2021-10-13 00:33:40,064 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-10-13 00:33:40,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 77 treesize of output 45 [2021-10-13 00:33:40,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 32 treesize of output 20 [2021-10-13 00:33:40,085 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:33:40,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810169860] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:33:40,086 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:33:40,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 34] total 52 [2021-10-13 00:33:40,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414404326] [2021-10-13 00:33:40,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-10-13 00:33:40,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:33:40,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-10-13 00:33:40,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2569, Unknown=6, NotChecked=0, Total=2756 [2021-10-13 00:33:40,089 INFO L87 Difference]: Start difference. First operand 118 states and 125 transitions. Second operand has 53 states, 50 states have (on average 2.04) internal successors, (102), 42 states have internal predecessors, (102), 8 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (9), 8 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:34:25,118 WARN L207 SmtUtils]: Spent 5.30 s on a formula simplification. DAG size of input: 86 DAG size of output: 80 [2021-10-13 00:35:51,095 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-10-13 00:35:51,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-10-13 00:35:51,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-10-13 00:35:51,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-13 00:35:51,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-10-13 00:35:51,306 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:260) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:61) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.getRedundancy(SimplifyDDA.java:621) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getRedundancy(SimplifyDDAWithTimeout.java:120) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA$Simplifier.walk(SimplifyDDA.java:371) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.simplifyOnce(SimplifyDDA.java:650) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getSimplifiedTerm(SimplifyDDAWithTimeout.java:184) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:174) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:140) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:388) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:229) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.getOrConstructPredicate(DeterministicInterpolantAutomaton.java:282) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.constructSuccessorsAndTransitions(DeterministicInterpolantAutomaton.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:79) 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:864) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:778) 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:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) 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$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 56 more [2021-10-13 00:35:51,310 INFO L168 Benchmark]: Toolchain (without parser) took 279422.91 ms. Allocated memory was 90.2 MB in the beginning and 264.2 MB in the end (delta: 174.1 MB). Free memory was 66.4 MB in the beginning and 192.1 MB in the end (delta: -125.7 MB). Peak memory consumption was 190.9 MB. Max. memory is 16.1 GB. [2021-10-13 00:35:51,310 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 90.2 MB. Free memory is still 62.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:35:51,310 INFO L168 Benchmark]: CACSL2BoogieTranslator took 499.00 ms. Allocated memory is still 90.2 MB. Free memory was 66.2 MB in the beginning and 58.4 MB in the end (delta: 7.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 00:35:51,311 INFO L168 Benchmark]: Boogie Preprocessor took 127.18 ms. Allocated memory is still 90.2 MB. Free memory was 58.4 MB in the beginning and 55.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:35:51,311 INFO L168 Benchmark]: RCFGBuilder took 814.10 ms. Allocated memory was 90.2 MB in the beginning and 111.1 MB in the end (delta: 21.0 MB). Free memory was 55.6 MB in the beginning and 74.9 MB in the end (delta: -19.3 MB). Peak memory consumption was 20.7 MB. Max. memory is 16.1 GB. [2021-10-13 00:35:51,312 INFO L168 Benchmark]: TraceAbstraction took 277977.32 ms. Allocated memory was 111.1 MB in the beginning and 264.2 MB in the end (delta: 153.1 MB). Free memory was 74.4 MB in the beginning and 192.1 MB in the end (delta: -117.7 MB). Peak memory consumption was 177.8 MB. Max. memory is 16.1 GB. [2021-10-13 00:35:51,313 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 90.2 MB. Free memory is still 62.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 499.00 ms. Allocated memory is still 90.2 MB. Free memory was 66.2 MB in the beginning and 58.4 MB in the end (delta: 7.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 127.18 ms. Allocated memory is still 90.2 MB. Free memory was 58.4 MB in the beginning and 55.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 814.10 ms. Allocated memory was 90.2 MB in the beginning and 111.1 MB in the end (delta: 21.0 MB). Free memory was 55.6 MB in the beginning and 74.9 MB in the end (delta: -19.3 MB). Peak memory consumption was 20.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 277977.32 ms. Allocated memory was 111.1 MB in the beginning and 264.2 MB in the end (delta: 153.1 MB). Free memory was 74.4 MB in the beginning and 192.1 MB in the end (delta: -117.7 MB). Peak memory consumption was 177.8 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 00:35:53,526 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 00:35:53,529 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 00:35:53,562 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 00:35:53,563 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 00:35:53,564 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 00:35:53,566 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 00:35:53,569 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 00:35:53,572 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 00:35:53,573 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 00:35:53,574 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 00:35:53,576 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 00:35:53,577 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 00:35:53,578 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 00:35:53,579 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 00:35:53,581 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 00:35:53,582 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 00:35:53,583 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 00:35:53,586 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 00:35:53,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 00:35:53,591 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 00:35:53,593 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 00:35:53,594 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 00:35:53,595 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 00:35:53,600 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 00:35:53,600 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 00:35:53,601 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 00:35:53,602 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 00:35:53,602 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 00:35:53,604 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 00:35:53,604 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 00:35:53,605 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 00:35:53,606 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 00:35:53,607 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 00:35:53,609 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 00:35:53,609 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 00:35:53,610 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 00:35:53,611 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 00:35:53,611 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 00:35:53,612 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 00:35:53,613 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 00:35:53,617 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-10-13 00:35:53,646 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 00:35:53,646 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 00:35:53,647 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-13 00:35:53,647 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-13 00:35:53,648 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 00:35:53,649 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 00:35:53,649 INFO L138 SettingsManager]: * Use SBE=true [2021-10-13 00:35:53,649 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 00:35:53,649 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 00:35:53,650 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 00:35:53,650 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 00:35:53,650 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 00:35:53,650 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 00:35:53,651 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 00:35:53,651 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 00:35:53,651 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 00:35:53,651 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 00:35:53,651 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 00:35:53,652 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 00:35:53,652 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 00:35:53,652 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 00:35:53,652 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 00:35:53,653 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 00:35:53,653 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 00:35:53,653 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 00:35:53,653 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:35:53,654 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 00:35:53,654 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 00:35:53,654 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-10-13 00:35:53,654 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 00:35:53,655 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 00:35:53,655 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 00:35:53,655 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_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93a1ae2d9d86f9fff42650a9c6bf56405d253963 [2021-10-13 00:35:54,146 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 00:35:54,167 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 00:35:54,170 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 00:35:54,171 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 00:35:54,177 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 00:35:54,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/../../sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-10-13 00:35:54,259 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/ed8740602/1c0be3032559451081dc96e49bdff4b7/FLAG7c4a2b32a [2021-10-13 00:35:54,926 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 00:35:54,927 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i [2021-10-13 00:35:54,940 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/ed8740602/1c0be3032559451081dc96e49bdff4b7/FLAG7c4a2b32a [2021-10-13 00:35:55,207 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/data/ed8740602/1c0be3032559451081dc96e49bdff4b7 [2021-10-13 00:35:55,211 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 00:35:55,213 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-13 00:35:55,214 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 00:35:55,215 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 00:35:55,219 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 00:35:55,231 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,233 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e9f490d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55, skipping insertion in model container [2021-10-13 00:35:55,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,239 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 00:35:55,275 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 00:35:55,657 WARN L228 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_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-10-13 00:35:55,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:35:55,678 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 00:35:55,733 WARN L228 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_2184f13d-ac21-442f-9be4-117c6b839547/sv-benchmarks/c/list-simple/dll2c_remove_all_reverse.i[24177,24190] [2021-10-13 00:35:55,738 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:35:55,783 INFO L208 MainTranslator]: Completed translation [2021-10-13 00:35:55,783 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55 WrapperNode [2021-10-13 00:35:55,784 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 00:35:55,785 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 00:35:55,785 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 00:35:55,785 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 00:35:55,797 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,816 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,817 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,840 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,849 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,857 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 00:35:55,866 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 00:35:55,866 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 00:35:55,866 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 00:35:55,867 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (1/1) ... [2021-10-13 00:35:55,875 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:35:55,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:35:55,900 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 00:35:55,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 00:35:55,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-13 00:35:55,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 00:35:55,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.setCurrentRoundingMode [2021-10-13 00:35:55,961 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-13 00:35:55,961 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-13 00:35:55,961 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-13 00:35:55,963 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-13 00:35:55,963 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-13 00:35:55,964 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-10-13 00:35:55,964 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_remove_last [2021-10-13 00:35:55,964 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-13 00:35:55,965 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-13 00:35:55,965 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-13 00:35:55,965 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-13 00:35:55,965 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-13 00:35:55,970 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-13 00:35:55,970 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 00:35:55,970 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-13 00:35:55,970 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-13 00:35:55,971 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-13 00:35:55,971 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-13 00:35:55,984 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-13 00:35:55,985 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-13 00:35:55,986 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-13 00:35:55,986 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-13 00:35:55,986 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-13 00:35:55,986 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-13 00:35:55,986 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-13 00:35:55,987 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-13 00:35:55,987 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-13 00:35:55,987 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-13 00:35:55,987 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-13 00:35:55,987 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-13 00:35:55,988 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-13 00:35:55,988 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-13 00:35:55,989 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-13 00:35:55,989 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-13 00:35:55,990 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-13 00:35:55,990 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-13 00:35:55,990 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-13 00:35:55,991 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-13 00:35:55,991 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-13 00:35:55,991 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-13 00:35:55,991 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-13 00:35:55,991 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-13 00:35:55,992 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-13 00:35:55,992 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-13 00:35:55,992 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-13 00:35:55,992 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-13 00:35:55,993 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-13 00:35:55,993 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-13 00:35:55,993 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-13 00:35:55,993 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-13 00:35:55,995 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-13 00:35:55,996 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-13 00:35:55,997 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-13 00:35:55,997 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-13 00:35:55,998 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-13 00:35:55,998 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-13 00:35:55,998 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-13 00:35:55,998 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-13 00:35:55,998 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-13 00:35:55,999 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-13 00:35:56,000 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-13 00:35:56,001 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-13 00:35:56,001 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-13 00:35:56,001 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-13 00:35:56,001 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-13 00:35:56,001 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-13 00:35:56,002 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-13 00:35:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-13 00:35:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-13 00:35:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-13 00:35:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-13 00:35:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-13 00:35:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-13 00:35:56,005 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-13 00:35:56,005 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-13 00:35:56,005 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-13 00:35:56,006 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-13 00:35:56,007 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-13 00:35:56,008 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-13 00:35:56,008 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-13 00:35:56,008 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-13 00:35:56,008 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-13 00:35:56,009 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-13 00:35:56,009 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-13 00:35:56,010 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-13 00:35:56,010 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 00:35:56,011 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-13 00:35:56,014 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-13 00:35:56,014 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-10-13 00:35:56,014 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_remove_last [2021-10-13 00:35:56,015 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-13 00:35:56,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 00:35:56,016 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-13 00:35:56,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-13 00:35:56,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-13 00:35:56,018 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 00:35:56,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 00:35:56,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.setCurrentRoundingMode [2021-10-13 00:35:56,023 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-13 00:35:56,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-13 00:35:56,024 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-13 00:35:56,539 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-13 00:35:56,925 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 00:35:56,928 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-10-13 00:35:56,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:35:56 BoogieIcfgContainer [2021-10-13 00:35:56,931 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 00:35:56,936 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 00:35:56,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 00:35:56,940 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 00:35:56,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 12:35:55" (1/3) ... [2021-10-13 00:35:56,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69fec84b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:35:56, skipping insertion in model container [2021-10-13 00:35:56,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:35:55" (2/3) ... [2021-10-13 00:35:56,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69fec84b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:35:56, skipping insertion in model container [2021-10-13 00:35:56,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:35:56" (3/3) ... [2021-10-13 00:35:56,944 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all_reverse.i [2021-10-13 00:35:56,950 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 00:35:56,950 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2021-10-13 00:35:57,015 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 00:35:57,027 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=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-10-13 00:35:57,028 INFO L340 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2021-10-13 00:35:57,050 INFO L276 IsEmpty]: Start isEmpty. Operand has 112 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 99 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:35:57,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 00:35:57,079 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:35:57,079 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:35:57,080 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:35:57,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:35:57,086 INFO L82 PathProgramCache]: Analyzing trace with hash -406889197, now seen corresponding path program 1 times [2021-10-13 00:35:57,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:35:57,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [80389771] [2021-10-13 00:35:57,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:35:57,100 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:35:57,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:35:57,104 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:35:57,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 00:35:57,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:35:57,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-13 00:35:57,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:35:57,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:35:57,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:57,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:35:57,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:57,492 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:35:57,492 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [80389771] [2021-10-13 00:35:57,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [80389771] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:35:57,493 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:35:57,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 00:35:57,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996112028] [2021-10-13 00:35:57,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 00:35:57,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:35:57,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 00:35:57,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 00:35:57,524 INFO L87 Difference]: Start difference. First operand has 112 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 99 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:35:57,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:35:57,766 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2021-10-13 00:35:57,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 00:35:57,768 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-10-13 00:35:57,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:35:57,777 INFO L225 Difference]: With dead ends: 109 [2021-10-13 00:35:57,777 INFO L226 Difference]: Without dead ends: 103 [2021-10-13 00:35:57,778 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 00:35:57,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-13 00:35:57,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-13 00:35:57,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 52 states have (on average 1.8461538461538463) internal successors, (96), 92 states have internal predecessors, (96), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:35:57,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 107 transitions. [2021-10-13 00:35:57,824 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 107 transitions. Word has length 12 [2021-10-13 00:35:57,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:35:57,825 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 107 transitions. [2021-10-13 00:35:57,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:35:57,825 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 107 transitions. [2021-10-13 00:35:57,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 00:35:57,826 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:35:57,826 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:35:57,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 00:35:58,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:35:58,041 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:35:58,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:35:58,042 INFO L82 PathProgramCache]: Analyzing trace with hash -406889196, now seen corresponding path program 1 times [2021-10-13 00:35:58,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:35:58,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1995267292] [2021-10-13 00:35:58,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:35:58,044 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:35:58,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:35:58,045 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:35:58,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 00:35:58,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:35:58,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:35:58,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:35:58,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:35:58,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:58,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:35:58,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:58,410 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:35:58,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1995267292] [2021-10-13 00:35:58,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1995267292] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:35:58,411 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:35:58,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-10-13 00:35:58,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733923811] [2021-10-13 00:35:58,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:35:58,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:35:58,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:35:58,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:35:58,415 INFO L87 Difference]: Start difference. First operand 103 states and 107 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:35:58,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:35:58,781 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-10-13 00:35:58,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 00:35:58,782 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-10-13 00:35:58,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:35:58,783 INFO L225 Difference]: With dead ends: 100 [2021-10-13 00:35:58,784 INFO L226 Difference]: Without dead ends: 100 [2021-10-13 00:35:58,784 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.8ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:35:58,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-13 00:35:58,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-13 00:35:58,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 52 states have (on average 1.7884615384615385) internal successors, (93), 89 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:35:58,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-10-13 00:35:58,794 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 12 [2021-10-13 00:35:58,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:35:58,795 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-10-13 00:35:58,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:35:58,795 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-10-13 00:35:58,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-13 00:35:58,796 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:35:58,797 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:35:58,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-10-13 00:35:59,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:35:59,008 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:35:59,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:35:59,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1333264339, now seen corresponding path program 1 times [2021-10-13 00:35:59,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:35:59,010 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1340088070] [2021-10-13 00:35:59,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:35:59,010 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:35:59,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:35:59,012 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:35:59,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 00:35:59,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:35:59,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 00:35:59,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:35:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:59,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:35:59,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:35:59,378 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:35:59,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1340088070] [2021-10-13 00:35:59,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1340088070] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:35:59,378 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:35:59,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-10-13 00:35:59,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427277904] [2021-10-13 00:35:59,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:35:59,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:35:59,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:35:59,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:35:59,387 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 8 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:35:59,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:35:59,473 INFO L93 Difference]: Finished difference Result 111 states and 117 transitions. [2021-10-13 00:35:59,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:35:59,474 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2021-10-13 00:35:59,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:35:59,479 INFO L225 Difference]: With dead ends: 111 [2021-10-13 00:35:59,479 INFO L226 Difference]: Without dead ends: 111 [2021-10-13 00:35:59,480 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 48.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:35:59,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-10-13 00:35:59,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 101. [2021-10-13 00:35:59,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 53 states have (on average 1.7735849056603774) internal successors, (94), 90 states have internal predecessors, (94), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:35:59,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 105 transitions. [2021-10-13 00:35:59,492 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 105 transitions. Word has length 20 [2021-10-13 00:35:59,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:35:59,492 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 105 transitions. [2021-10-13 00:35:59,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:35:59,493 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 105 transitions. [2021-10-13 00:35:59,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-13 00:35:59,494 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:35:59,494 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:35:59,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 00:35:59,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:35:59,703 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:35:59,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:35:59,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1423702394, now seen corresponding path program 1 times [2021-10-13 00:35:59,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:35:59,706 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2043180509] [2021-10-13 00:35:59,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:35:59,714 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:35:59,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:35:59,715 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:35:59,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 00:35:59,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:35:59,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:35:59,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:36:00,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:36:00,104 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:36:00,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:36:00,271 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:36:00,271 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:36:00,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2043180509] [2021-10-13 00:36:00,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2043180509] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:36:00,272 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:36:00,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 5 [2021-10-13 00:36:00,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429436257] [2021-10-13 00:36:00,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:36:00,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:36:00,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:36:00,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:36:00,276 INFO L87 Difference]: Start difference. First operand 101 states and 105 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:36:00,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:36:00,755 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2021-10-13 00:36:00,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:36:00,756 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-10-13 00:36:00,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:36:00,759 INFO L225 Difference]: With dead ends: 101 [2021-10-13 00:36:00,759 INFO L226 Difference]: Without dead ends: 101 [2021-10-13 00:36:00,759 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:36:00,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-10-13 00:36:00,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-10-13 00:36:00,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 53 states have (on average 1.7547169811320755) internal successors, (93), 89 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:36:00,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-10-13 00:36:00,784 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 30 [2021-10-13 00:36:00,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:36:00,784 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-10-13 00:36:00,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:36:00,785 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-10-13 00:36:00,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-13 00:36:00,786 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:36:00,786 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:36:00,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-13 00:36:01,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:36:01,005 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:36:01,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:36:01,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1423702395, now seen corresponding path program 1 times [2021-10-13 00:36:01,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:36:01,006 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1609409778] [2021-10-13 00:36:01,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:36:01,007 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:36:01,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:36:01,008 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:36:01,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 00:36:01,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:36:01,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 00:36:01,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:36:01,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:36:01,422 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:36:01,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:36:01,867 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:36:01,867 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:36:01,868 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1609409778] [2021-10-13 00:36:01,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1609409778] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:36:01,868 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:36:01,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-10-13 00:36:01,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377253862] [2021-10-13 00:36:01,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 00:36:01,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:36:01,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 00:36:01,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:36:01,870 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 10 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:36:02,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:36:02,839 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-10-13 00:36:02,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:36:02,842 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 30 [2021-10-13 00:36:02,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:36:02,843 INFO L225 Difference]: With dead ends: 100 [2021-10-13 00:36:02,843 INFO L226 Difference]: Without dead ends: 100 [2021-10-13 00:36:02,844 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 261.8ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:36:02,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-13 00:36:02,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-10-13 00:36:02,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 53 states have (on average 1.7358490566037736) internal successors, (92), 88 states have internal predecessors, (92), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:36:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2021-10-13 00:36:02,852 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 30 [2021-10-13 00:36:02,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:36:02,853 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2021-10-13 00:36:02,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:36:02,854 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2021-10-13 00:36:02,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:36:02,855 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:36:02,855 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:36:02,869 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 00:36:03,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:36:03,069 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:36:03,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:36:03,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1916566213, now seen corresponding path program 1 times [2021-10-13 00:36:03,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:36:03,070 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [676168048] [2021-10-13 00:36:03,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:36:03,070 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:36:03,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:36:03,074 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:36:03,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-13 00:36:03,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:36:03,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 00:36:03,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:36:03,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:36:03,532 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-13 00:36:03,533 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 1 case distinctions, treesize of input 16 treesize of output 21 [2021-10-13 00:36:03,575 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:36:03,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:36:03,906 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:36:03,906 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:36:03,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [676168048] [2021-10-13 00:36:03,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [676168048] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:36:03,907 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:36:03,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-10-13 00:36:03,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670083732] [2021-10-13 00:36:03,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:36:03,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:36:03,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:36:03,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:36:03,909 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:36:04,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:36:04,789 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2021-10-13 00:36:04,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 00:36:04,790 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-10-13 00:36:04,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:36:04,791 INFO L225 Difference]: With dead ends: 115 [2021-10-13 00:36:04,791 INFO L226 Difference]: Without dead ends: 115 [2021-10-13 00:36:04,792 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 222.0ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:36:04,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-10-13 00:36:04,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 104. [2021-10-13 00:36:04,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 57 states have (on average 1.719298245614035) internal successors, (98), 92 states have internal predecessors, (98), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:36:04,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 111 transitions. [2021-10-13 00:36:04,800 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 111 transitions. Word has length 32 [2021-10-13 00:36:04,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:36:04,800 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 111 transitions. [2021-10-13 00:36:04,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-13 00:36:04,801 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 111 transitions. [2021-10-13 00:36:04,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:36:04,802 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:36:04,802 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:36:04,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-13 00:36:05,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:36:05,011 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:36:05,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:36:05,012 INFO L82 PathProgramCache]: Analyzing trace with hash -1916566212, now seen corresponding path program 1 times [2021-10-13 00:36:05,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:36:05,012 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1089626716] [2021-10-13 00:36:05,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:36:05,012 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:36:05,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:36:05,013 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:36:05,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 00:36:05,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:36:05,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 00:36:05,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:36:05,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:36:05,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:36:05,681 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:36:05,682 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 1 case distinctions, treesize of input 31 treesize of output 33 [2021-10-13 00:36:05,693 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:36:05,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 30 [2021-10-13 00:36:05,853 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:36:05,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:36:10,804 WARN L860 $PredicateComparison]: unable to prove that (forall ((v_dll_circular_create_~head~0.offset_BEFORE_CALL_2 (_ BitVec 32)) (v_dll_circular_create_~head~0.base_BEFORE_CALL_4 (_ BitVec 32))) (or (exists ((v_node_create_~temp~0.base_43 (_ BitVec 32))) (and (let ((.cse0 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (or (not (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse0)) (not (bvule .cse0 (select (store |c_old(#length)| v_node_create_~temp~0.base_43 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4))))) (= (_ bv0 1) (bvneg (bvneg (bvneg (select |c_old(#valid)| v_node_create_~temp~0.base_43))))))) (let ((.cse1 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (and (bvule .cse1 (select |c_#length| v_dll_circular_create_~head~0.base_BEFORE_CALL_4)) (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse1))))) is different from true [2021-10-13 00:36:15,808 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_dll_circular_create_~head~0.offset_BEFORE_CALL_2 (_ BitVec 32)) (v_dll_circular_create_~head~0.base_BEFORE_CALL_4 (_ BitVec 32)) (v_node_create_~temp~0.base_44 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (and (bvule .cse0 (select (store |c_#length| v_node_create_~temp~0.base_44 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4)) (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse0))) (exists ((v_node_create_~temp~0.base_43 (_ BitVec 32))) (and (let ((.cse1 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (or (not (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse1)) (not (bvule .cse1 (select (store |c_old(#length)| v_node_create_~temp~0.base_43 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4))))) (= (_ bv0 1) (bvneg (bvneg (bvneg (select |c_old(#valid)| v_node_create_~temp~0.base_43))))))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_node_create_~temp~0.base_44)))))) is different from false [2021-10-13 00:36:17,822 WARN L860 $PredicateComparison]: unable to prove that (forall ((v_dll_circular_create_~head~0.offset_BEFORE_CALL_2 (_ BitVec 32)) (v_dll_circular_create_~head~0.base_BEFORE_CALL_4 (_ BitVec 32)) (v_node_create_~temp~0.base_44 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (and (bvule .cse0 (select (store |c_#length| v_node_create_~temp~0.base_44 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4)) (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse0))) (exists ((v_node_create_~temp~0.base_43 (_ BitVec 32))) (and (let ((.cse1 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (or (not (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse1)) (not (bvule .cse1 (select (store |c_old(#length)| v_node_create_~temp~0.base_43 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4))))) (= (_ bv0 1) (bvneg (bvneg (bvneg (select |c_old(#valid)| v_node_create_~temp~0.base_43))))))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_node_create_~temp~0.base_44)))))) is different from true [2021-10-13 00:36:21,281 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2021-10-13 00:36:21,282 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:36:21,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1089626716] [2021-10-13 00:36:21,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1089626716] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:36:21,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:36:21,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-10-13 00:36:21,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972106577] [2021-10-13 00:36:21,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-13 00:36:21,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:36:21,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-13 00:36:21,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=150, Unknown=4, NotChecked=50, Total=240 [2021-10-13 00:36:21,286 INFO L87 Difference]: Start difference. First operand 104 states and 111 transitions. Second operand has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 12 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:36:24,158 WARN L838 $PredicateComparison]: unable to prove that (and (= |c_old(#valid)| |c_#valid|) (= |c_#length| |c_old(#length)|) (forall ((v_dll_circular_create_~head~0.offset_BEFORE_CALL_2 (_ BitVec 32)) (v_dll_circular_create_~head~0.base_BEFORE_CALL_4 (_ BitVec 32)) (v_node_create_~temp~0.base_44 (_ BitVec 32))) (or (let ((.cse0 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (and (bvule .cse0 (select (store |c_#length| v_node_create_~temp~0.base_44 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4)) (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse0))) (exists ((v_node_create_~temp~0.base_43 (_ BitVec 32))) (and (let ((.cse1 (bvadd (_ bv8 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2))) (or (not (bvule (bvadd (_ bv4 32) v_dll_circular_create_~head~0.offset_BEFORE_CALL_2) .cse1)) (not (bvule .cse1 (select (store |c_old(#length)| v_node_create_~temp~0.base_43 (_ bv12 32)) v_dll_circular_create_~head~0.base_BEFORE_CALL_4))))) (= (_ bv0 1) (bvneg (bvneg (bvneg (select |c_old(#valid)| v_node_create_~temp~0.base_43))))))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_node_create_~temp~0.base_44))))))) is different from false [2021-10-13 00:36:54,819 WARN L207 SmtUtils]: Spent 8.22 s on a formula simplification. DAG size of input: 61 DAG size of output: 35 [2021-10-13 00:37:03,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:03,944 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2021-10-13 00:37:03,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 00:37:03,946 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 12 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 32 [2021-10-13 00:37:03,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:03,948 INFO L225 Difference]: With dead ends: 115 [2021-10-13 00:37:03,948 INFO L226 Difference]: Without dead ends: 115 [2021-10-13 00:37:03,949 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 3 IntricatePredicates, 2 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 50308.7ms TimeCoverageRelationStatistics Valid=95, Invalid=370, Unknown=9, NotChecked=126, Total=600 [2021-10-13 00:37:03,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-10-13 00:37:03,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 112. [2021-10-13 00:37:03,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 64 states have (on average 1.625) internal successors, (104), 99 states have internal predecessors, (104), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:03,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 117 transitions. [2021-10-13 00:37:03,957 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 117 transitions. Word has length 32 [2021-10-13 00:37:03,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:03,958 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 117 transitions. [2021-10-13 00:37:03,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 12 states have internal predecessors, (44), 3 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:37:03,958 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 117 transitions. [2021-10-13 00:37:03,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 00:37:03,959 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:03,960 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:03,972 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-10-13 00:37:04,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:04,163 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:04,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:04,164 INFO L82 PathProgramCache]: Analyzing trace with hash 720994289, now seen corresponding path program 1 times [2021-10-13 00:37:04,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:04,165 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1894437911] [2021-10-13 00:37:04,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:04,165 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:04,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:04,166 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:04,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 00:37:04,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:04,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:37:04,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:04,632 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:04,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:04,825 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:04,825 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:04,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1894437911] [2021-10-13 00:37:04,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1894437911] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:37:04,826 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:37:04,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-10-13 00:37:04,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544160006] [2021-10-13 00:37:04,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:37:04,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:04,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:37:04,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:37:04,827 INFO L87 Difference]: Start difference. First operand 112 states and 117 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:37:05,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:05,095 INFO L93 Difference]: Finished difference Result 113 states and 117 transitions. [2021-10-13 00:37:05,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:37:05,096 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-10-13 00:37:05,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:05,098 INFO L225 Difference]: With dead ends: 113 [2021-10-13 00:37:05,098 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 00:37:05,098 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 51.4ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:37:05,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 00:37:05,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-10-13 00:37:05,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 64 states have (on average 1.609375) internal successors, (103), 99 states have internal predecessors, (103), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:05,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2021-10-13 00:37:05,104 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 34 [2021-10-13 00:37:05,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:05,105 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2021-10-13 00:37:05,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:37:05,105 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2021-10-13 00:37:05,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 00:37:05,107 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:05,107 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:05,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:05,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:05,320 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:05,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:05,320 INFO L82 PathProgramCache]: Analyzing trace with hash 871205843, now seen corresponding path program 1 times [2021-10-13 00:37:05,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:05,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [229972837] [2021-10-13 00:37:05,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:05,321 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:05,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:05,322 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:05,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-10-13 00:37:05,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:05,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:37:05,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:05,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:37:05,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:05,744 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-10-13 00:37:05,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:37:05,840 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-13 00:37:05,840 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:05,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [229972837] [2021-10-13 00:37:05,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [229972837] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:37:05,841 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:37:05,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-10-13 00:37:05,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019370017] [2021-10-13 00:37:05,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:37:05,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:05,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:37:05,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:37:05,843 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:37:06,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:06,211 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2021-10-13 00:37:06,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 00:37:06,214 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-10-13 00:37:06,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:06,215 INFO L225 Difference]: With dead ends: 117 [2021-10-13 00:37:06,215 INFO L226 Difference]: Without dead ends: 117 [2021-10-13 00:37:06,216 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 00:37:06,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-10-13 00:37:06,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-10-13 00:37:06,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 67 states have (on average 1.6119402985074627) internal successors, (108), 102 states have internal predecessors, (108), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:06,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 121 transitions. [2021-10-13 00:37:06,221 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 121 transitions. Word has length 35 [2021-10-13 00:37:06,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:06,222 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 121 transitions. [2021-10-13 00:37:06,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:37:06,222 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 121 transitions. [2021-10-13 00:37:06,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 00:37:06,228 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:06,229 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:06,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:06,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:06,441 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:06,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:06,442 INFO L82 PathProgramCache]: Analyzing trace with hash 871205844, now seen corresponding path program 1 times [2021-10-13 00:37:06,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:06,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1553348901] [2021-10-13 00:37:06,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:06,443 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:06,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:06,444 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:06,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 00:37:06,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:06,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 00:37:06,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:07,056 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:07,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:07,219 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:37:07,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2021-10-13 00:37:07,873 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:07,873 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:07,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1553348901] [2021-10-13 00:37:07,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1553348901] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 00:37:07,874 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:37:07,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-10-13 00:37:07,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268872551] [2021-10-13 00:37:07,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:37:07,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:07,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:37:07,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:37:07,876 INFO L87 Difference]: Start difference. First operand 115 states and 121 transitions. Second operand has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:37:08,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:08,651 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2021-10-13 00:37:08,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:37:08,654 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-10-13 00:37:08,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:08,655 INFO L225 Difference]: With dead ends: 122 [2021-10-13 00:37:08,655 INFO L226 Difference]: Without dead ends: 122 [2021-10-13 00:37:08,656 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 436.3ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:37:08,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-10-13 00:37:08,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 115. [2021-10-13 00:37:08,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 67 states have (on average 1.5970149253731343) internal successors, (107), 102 states have internal predecessors, (107), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:08,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 120 transitions. [2021-10-13 00:37:08,662 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 120 transitions. Word has length 35 [2021-10-13 00:37:08,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:08,663 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 120 transitions. [2021-10-13 00:37:08,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:37:08,663 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 120 transitions. [2021-10-13 00:37:08,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-13 00:37:08,665 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:08,665 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:08,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:08,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:08,875 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:08,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:08,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1237577390, now seen corresponding path program 1 times [2021-10-13 00:37:08,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:08,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1705041516] [2021-10-13 00:37:08,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:08,877 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:08,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:08,877 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:08,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-13 00:37:09,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:09,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 00:37:09,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:09,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:37:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:09,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:10,310 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:10,310 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:10,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1705041516] [2021-10-13 00:37:10,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1705041516] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:37:10,311 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:37:10,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 11 [2021-10-13 00:37:10,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498709608] [2021-10-13 00:37:10,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:37:10,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:10,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:37:10,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:37:10,313 INFO L87 Difference]: Start difference. First operand 115 states and 120 transitions. Second operand has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:37:11,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:11,941 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2021-10-13 00:37:11,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:37:11,942 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 36 [2021-10-13 00:37:11,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:11,944 INFO L225 Difference]: With dead ends: 115 [2021-10-13 00:37:11,944 INFO L226 Difference]: Without dead ends: 115 [2021-10-13 00:37:11,944 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 587.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:37:11,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-10-13 00:37:11,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2021-10-13 00:37:11,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 67 states have (on average 1.5820895522388059) internal successors, (106), 101 states have internal predecessors, (106), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:11,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2021-10-13 00:37:11,949 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 36 [2021-10-13 00:37:11,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:11,950 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2021-10-13 00:37:11,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 1 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:37:11,950 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2021-10-13 00:37:11,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-13 00:37:11,951 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:11,952 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:11,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:12,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:12,165 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:12,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:12,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1237577389, now seen corresponding path program 1 times [2021-10-13 00:37:12,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:12,167 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1979817905] [2021-10-13 00:37:12,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:12,167 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:12,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:12,168 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:12,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-10-13 00:37:12,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:12,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 00:37:12,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:12,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:37:12,662 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:12,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:12,843 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:12,843 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:12,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1979817905] [2021-10-13 00:37:12,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1979817905] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:37:12,843 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:37:12,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 6 [2021-10-13 00:37:12,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423685938] [2021-10-13 00:37:12,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:37:12,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:12,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:37:12,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:37:12,845 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:37:13,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:13,456 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2021-10-13 00:37:13,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:37:13,457 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-10-13 00:37:13,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:13,458 INFO L225 Difference]: With dead ends: 114 [2021-10-13 00:37:13,458 INFO L226 Difference]: Without dead ends: 114 [2021-10-13 00:37:13,459 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 116.3ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:37:13,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-10-13 00:37:13,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-10-13 00:37:13,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 67 states have (on average 1.5671641791044777) internal successors, (105), 100 states have internal predecessors, (105), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-13 00:37:13,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 118 transitions. [2021-10-13 00:37:13,464 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 118 transitions. Word has length 36 [2021-10-13 00:37:13,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:13,464 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 118 transitions. [2021-10-13 00:37:13,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:37:13,464 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 118 transitions. [2021-10-13 00:37:13,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-10-13 00:37:13,466 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:13,466 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:13,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:13,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:13,679 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:13,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:13,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1272044326, now seen corresponding path program 1 times [2021-10-13 00:37:13,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:13,680 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [395389339] [2021-10-13 00:37:13,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:13,680 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:13,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:13,681 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:13,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-13 00:37:14,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:14,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:37:14,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:37:14,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:14,267 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:37:14,267 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:14,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [395389339] [2021-10-13 00:37:14,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [395389339] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 00:37:14,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:37:14,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 00:37:14,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194074949] [2021-10-13 00:37:14,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:37:14,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-13 00:37:14,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:37:14,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:37:14,269 INFO L87 Difference]: Start difference. First operand 113 states and 118 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:37:14,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:37:14,319 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2021-10-13 00:37:14,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 00:37:14,320 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 42 [2021-10-13 00:37:14,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:37:14,321 INFO L225 Difference]: With dead ends: 117 [2021-10-13 00:37:14,321 INFO L226 Difference]: Without dead ends: 117 [2021-10-13 00:37:14,321 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 41.5ms TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:37:14,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-10-13 00:37:14,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-10-13 00:37:14,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 70 states have (on average 1.542857142857143) internal successors, (108), 103 states have internal predecessors, (108), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:37:14,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2021-10-13 00:37:14,327 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 42 [2021-10-13 00:37:14,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:37:14,327 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2021-10-13 00:37:14,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:37:14,327 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2021-10-13 00:37:14,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:37:14,328 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:37:14,328 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:37:14,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-10-13 00:37:14,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 [2021-10-13 00:37:14,529 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_remove_lastErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 41 more)] === [2021-10-13 00:37:14,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:37:14,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1631220584, now seen corresponding path program 1 times [2021-10-13 00:37:14,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-13 00:37:14,530 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1123252263] [2021-10-13 00:37:14,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:14,530 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 00:37:14,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat [2021-10-13 00:37:14,531 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 00:37:14,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-13 00:37:14,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:14,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-13 00:37:14,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:14,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:37:15,526 INFO L354 Elim1Store]: treesize reduction 42, result has 33.3 percent of original size [2021-10-13 00:37:15,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 43 [2021-10-13 00:37:15,849 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:37:15,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:37:40,645 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:37:40,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 110 treesize of output 150 [2021-10-13 00:37:41,066 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-13 00:37:41,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1123252263] [2021-10-13 00:37:41,067 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for v_node_create_~temp~0.base_110 [2021-10-13 00:37:41,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1981720632] [2021-10-13 00:37:41,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:37:41,068 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 00:37:41,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/cvc4 [2021-10-13 00:37:41,072 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 00:37:41,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-10-13 00:37:41,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:37:41,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-13 00:37:41,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:37:41,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:37:41,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 11 [2021-10-13 00:38:15,714 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-10-13 00:38:15,715 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 2 case distinctions, treesize of input 34 treesize of output 43 [2021-10-13 00:38:17,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 00:38:17,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:38:29,983 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:38:29,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 105 treesize of output 109 [2021-10-13 00:38:31,028 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for |v_dll_circular_create_#t~ret7.base_58| [2021-10-13 00:38:31,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977549621] [2021-10-13 00:38:31,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:38:31,029 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:38:31,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:38:31,031 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:38:31,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-13 00:38:31,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:38:31,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 00:38:31,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:38:31,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:38:36,494 INFO L354 Elim1Store]: treesize reduction 42, result has 33.3 percent of original size [2021-10-13 00:38:36,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 42 [2021-10-13 00:38:36,757 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:38:36,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 00:39:59,095 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 00:39:59,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 102 treesize of output 142 [2021-10-13 00:39:59,487 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for v_node_create_~temp~0.base_139 [2021-10-13 00:39:59,487 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:39:59,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-10-13 00:39:59,487 ERROR L172 FreeRefinementEngine]: Strategy WOLF failed to provide any proof altough trace is infeasible [2021-10-13 00:39:59,487 INFO L626 BasicCegarLoop]: Counterexample might be feasible [2021-10-13 00:39:59,495 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr0REQUIRES_VIOLATION [2021-10-13 00:39:59,497 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr0REQUIRES_VIOLATION [2021-10-13 00:39:59,497 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr1REQUIRES_VIOLATION [2021-10-13 00:39:59,497 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr2REQUIRES_VIOLATION [2021-10-13 00:39:59,498 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr3REQUIRES_VIOLATION [2021-10-13 00:39:59,498 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr4REQUIRES_VIOLATION [2021-10-13 00:39:59,498 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr5REQUIRES_VIOLATION [2021-10-13 00:39:59,498 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr6REQUIRES_VIOLATION [2021-10-13 00:39:59,499 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_createErr7REQUIRES_VIOLATION [2021-10-13 00:39:59,499 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr0REQUIRES_VIOLATION [2021-10-13 00:39:59,499 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr1REQUIRES_VIOLATION [2021-10-13 00:39:59,499 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr2REQUIRES_VIOLATION [2021-10-13 00:39:59,500 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr3REQUIRES_VIOLATION [2021-10-13 00:39:59,500 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr4REQUIRES_VIOLATION [2021-10-13 00:39:59,500 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location node_createErr5REQUIRES_VIOLATION [2021-10-13 00:39:59,500 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr0REQUIRES_VIOLATION [2021-10-13 00:39:59,501 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION [2021-10-13 00:39:59,501 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 00:39:59,501 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-10-13 00:39:59,501 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr1REQUIRES_VIOLATION [2021-10-13 00:39:59,502 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr2REQUIRES_VIOLATION [2021-10-13 00:39:59,502 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr3REQUIRES_VIOLATION [2021-10-13 00:39:59,502 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr4REQUIRES_VIOLATION [2021-10-13 00:39:59,502 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr5REQUIRES_VIOLATION [2021-10-13 00:39:59,502 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr6REQUIRES_VIOLATION [2021-10-13 00:39:59,503 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr7REQUIRES_VIOLATION [2021-10-13 00:39:59,503 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,503 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr9ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,503 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr10ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,504 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr11REQUIRES_VIOLATION [2021-10-13 00:39:59,504 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr12REQUIRES_VIOLATION [2021-10-13 00:39:59,504 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr13REQUIRES_VIOLATION [2021-10-13 00:39:59,504 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr14REQUIRES_VIOLATION [2021-10-13 00:39:59,505 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr15ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,505 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr16ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,505 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr17ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:39:59,505 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr18REQUIRES_VIOLATION [2021-10-13 00:39:59,506 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr19REQUIRES_VIOLATION [2021-10-13 00:39:59,506 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr20REQUIRES_VIOLATION [2021-10-13 00:39:59,506 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr21REQUIRES_VIOLATION [2021-10-13 00:39:59,506 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr22REQUIRES_VIOLATION [2021-10-13 00:39:59,506 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr23REQUIRES_VIOLATION [2021-10-13 00:39:59,507 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr24REQUIRES_VIOLATION [2021-10-13 00:39:59,507 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location dll_circular_remove_lastErr25REQUIRES_VIOLATION [2021-10-13 00:39:59,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-13 00:39:59,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-10-13 00:39:59,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-10-13 00:40:00,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/cvc4 --incremental --print-success --lang smt [2021-10-13 00:40:00,129 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 00:40:00,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 12:40:00 BoogieIcfgContainer [2021-10-13 00:40:00,140 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 00:40:00,141 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 00:40:00,141 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 00:40:00,141 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 00:40:00,141 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:35:56" (3/4) ... [2021-10-13 00:40:00,145 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-10-13 00:40:00,145 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 00:40:00,146 INFO L168 Benchmark]: Toolchain (without parser) took 244932.92 ms. Allocated memory was 56.6 MB in the beginning and 102.8 MB in the end (delta: 46.1 MB). Free memory was 33.3 MB in the beginning and 49.0 MB in the end (delta: -15.6 MB). Peak memory consumption was 29.0 MB. Max. memory is 16.1 GB. [2021-10-13 00:40:00,146 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 56.6 MB. Free memory is still 37.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:40:00,146 INFO L168 Benchmark]: CACSL2BoogieTranslator took 569.72 ms. Allocated memory is still 56.6 MB. Free memory was 33.2 MB in the beginning and 31.4 MB in the end (delta: 1.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-13 00:40:00,147 INFO L168 Benchmark]: Boogie Preprocessor took 80.23 ms. Allocated memory is still 56.6 MB. Free memory was 31.4 MB in the beginning and 28.3 MB in the end (delta: 3.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 00:40:00,147 INFO L168 Benchmark]: RCFGBuilder took 1065.90 ms. Allocated memory was 56.6 MB in the beginning and 81.8 MB in the end (delta: 25.2 MB). Free memory was 28.2 MB in the beginning and 60.7 MB in the end (delta: -32.5 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:40:00,148 INFO L168 Benchmark]: TraceAbstraction took 243203.85 ms. Allocated memory was 81.8 MB in the beginning and 102.8 MB in the end (delta: 21.0 MB). Free memory was 60.3 MB in the beginning and 49.7 MB in the end (delta: 10.6 MB). Peak memory consumption was 62.7 MB. Max. memory is 16.1 GB. [2021-10-13 00:40:00,148 INFO L168 Benchmark]: Witness Printer took 4.33 ms. Allocated memory is still 102.8 MB. Free memory is still 49.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:40:00,150 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 56.6 MB. Free memory is still 37.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 569.72 ms. Allocated memory is still 56.6 MB. Free memory was 33.2 MB in the beginning and 31.4 MB in the end (delta: 1.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 80.23 ms. Allocated memory is still 56.6 MB. Free memory was 31.4 MB in the beginning and 28.3 MB in the end (delta: 3.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1065.90 ms. Allocated memory was 56.6 MB in the beginning and 81.8 MB in the end (delta: 25.2 MB). Free memory was 28.2 MB in the beginning and 60.7 MB in the end (delta: -32.5 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 243203.85 ms. Allocated memory was 81.8 MB in the beginning and 102.8 MB in the end (delta: 21.0 MB). Free memory was 60.3 MB in the beginning and 49.7 MB in the end (delta: 10.6 MB). Peak memory consumption was 62.7 MB. Max. memory is 16.1 GB. * Witness Printer took 4.33 ms. Allocated memory is still 102.8 MB. Free memory is still 49.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 602]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L614] const int len = 2; [L615] const int data = 1; [L616] DLL s = dll_circular_create(len, data); [L616] CALL, EXPR dll_circular_create(len, data) [L586] CALL, EXPR node_create(data) [L576] DLL temp = (DLL) malloc(sizeof(struct node)); [L577] COND FALSE !(((void *)0) == temp) [L580] temp->next = ((void *)0) [L581] temp->prev = ((void *)0) [L582] temp->data = data [L583] return temp; [L586] RET, EXPR node_create(data) [L586] DLL head = node_create(data); [L587] DLL last = head; [L588] COND TRUE len > 1 [L589] CALL, EXPR node_create(data) [L576] DLL temp = (DLL) malloc(sizeof(struct node)); [L577] COND FALSE !(((void *)0) == temp) [L580] temp->next = ((void *)0) [L581] temp->prev = ((void *)0) [L582] temp->data = data [L583] return temp; [L589] RET, EXPR node_create(data) [L589] DLL new_head = node_create(data); [L590] new_head->next = head [L591] COND TRUE \read(head) [L592] head->prev = new_head [L594] head = new_head [L595] len-- [L588] COND FALSE !(len > 1) [L597] last->next = head [L598] head->prev = last [L599] return head; [L616] RET, EXPR dll_circular_create(len, data) [L616] DLL s = dll_circular_create(len, data); [L617] int i; [L618] i = 0 [L618] COND TRUE i < len [L619] CALL dll_circular_remove_last(&s) [L602] \read(*head) - UnprovableResult [Line: 590]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 590]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 592]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 592]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 597]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 597]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 598]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 598]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 580]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 580]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 581]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 581]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 582]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 582]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 621]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 621]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 625]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - UnprovableResult [Line: 613]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - UnprovableResult [Line: 602]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 602]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 602]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 603]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 603]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 604]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 605]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 605]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 607]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 607]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 608]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 608]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 608]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 609]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 609]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 609]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 609]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 610]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 610]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 610]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 610]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 11 procedures, 128 locations, 44 error locations. Started 1 CEGAR loops. OverallTime: 243114.7ms, OverallIterations: 14, TraceHistogramMax: 2, EmptinessCheckTime: 52.4ms, AutomataDifference: 49476.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 17.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1180 SDtfs, 383 SDslu, 3560 SDs, 0 SdLazy, 2599 SolverSat, 66 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8398.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 791 GetRequests, 671 SyntacticMatches, 14 SemanticMatches, 106 ConstructedPredicates, 3 IntricatePredicates, 2 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 52206.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=117occurred in iteration=13, InterpolantAutomatonStates: 88, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 134.2ms AutomataMinimizationTime, 13 MinimizatonAttempts, 38 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 175.1ms SsaConstructionTime, 900.7ms SatisfiabilityAnalysisTime, 21636.8ms InterpolantComputationTime, 386 NumberOfCodeBlocks, 386 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 746 ConstructedInterpolants, 44 QuantifiedInterpolants, 3794 SizeOfPredicates, 27 NumberOfNonLiveVariables, 2168 ConjunctsInSsa, 83 ConjunctsInUnsatCore, 26 InterpolantComputations, 16 PerfectInterpolantSequences, 112/172 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-10-13 00:40:00,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2184f13d-ac21-442f-9be4-117c6b839547/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...