./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_append_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_append_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL --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 208d04089fa2c50848123d29dd18b6b2021c1b591464bd422fd10955aaeec7fc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 04:52:13,839 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 04:52:13,843 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 04:52:13,891 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 04:52:13,892 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 04:52:13,894 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 04:52:13,896 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 04:52:13,900 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 04:52:13,903 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 04:52:13,904 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 04:52:13,906 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 04:52:13,908 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 04:52:13,909 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 04:52:13,910 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 04:52:13,913 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 04:52:13,915 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 04:52:13,917 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 04:52:13,919 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 04:52:13,922 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 04:52:13,925 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 04:52:13,928 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 04:52:13,930 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 04:52:13,932 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 04:52:13,934 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 04:52:13,939 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 04:52:13,940 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 04:52:13,940 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 04:52:13,952 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 04:52:13,953 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 04:52:13,955 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 04:52:13,955 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 04:52:13,957 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 04:52:13,958 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 04:52:13,960 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 04:52:13,962 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 04:52:13,965 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 04:52:13,967 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 04:52:13,968 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 04:52:13,970 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 04:52:13,971 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 04:52:13,973 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 04:52:13,974 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-19 04:52:14,042 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 04:52:14,042 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 04:52:14,043 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-19 04:52:14,044 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-19 04:52:14,045 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 04:52:14,045 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 04:52:14,046 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-19 04:52:14,047 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-19 04:52:14,047 INFO L138 SettingsManager]: * Use SBE=true [2021-11-19 04:52:14,048 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 04:52:14,050 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 04:52:14,050 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 04:52:14,050 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 04:52:14,051 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 04:52:14,051 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 04:52:14,051 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-19 04:52:14,052 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-19 04:52:14,052 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-19 04:52:14,052 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 04:52:14,052 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 04:52:14,053 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 04:52:14,053 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 04:52:14,053 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 04:52:14,054 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-19 04:52:14,054 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 04:52:14,054 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:52:14,055 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 04:52:14,055 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 04:52:14,055 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-19 04:52:14,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 04:52:14,058 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 04:52:14,058 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_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 208d04089fa2c50848123d29dd18b6b2021c1b591464bd422fd10955aaeec7fc [2021-11-19 04:52:14,414 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 04:52:14,460 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 04:52:14,465 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 04:52:14,467 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 04:52:14,468 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 04:52:14,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/../../sv-benchmarks/c/list-simple/dll2c_append_equal.i [2021-11-19 04:52:14,571 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/data/1e52b96b9/c50f3ca3400142d793428b92e1541c96/FLAG9aa62f09c [2021-11-19 04:52:15,325 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 04:52:15,326 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/sv-benchmarks/c/list-simple/dll2c_append_equal.i [2021-11-19 04:52:15,351 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/data/1e52b96b9/c50f3ca3400142d793428b92e1541c96/FLAG9aa62f09c [2021-11-19 04:52:15,618 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/data/1e52b96b9/c50f3ca3400142d793428b92e1541c96 [2021-11-19 04:52:15,621 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 04:52:15,623 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-19 04:52:15,638 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 04:52:15,639 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 04:52:15,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 04:52:15,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:52:15" (1/1) ... [2021-11-19 04:52:15,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63bed7c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:15, skipping insertion in model container [2021-11-19 04:52:15,649 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:52:15" (1/1) ... [2021-11-19 04:52:15,658 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 04:52:15,740 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 04:52:16,176 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/sv-benchmarks/c/list-simple/dll2c_append_equal.i[24585,24598] [2021-11-19 04:52:16,183 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:52:16,197 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 04:52:16,269 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/sv-benchmarks/c/list-simple/dll2c_append_equal.i[24585,24598] [2021-11-19 04:52:16,270 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 04:52:16,311 INFO L208 MainTranslator]: Completed translation [2021-11-19 04:52:16,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16 WrapperNode [2021-11-19 04:52:16,314 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 04:52:16,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 04:52:16,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 04:52:16,317 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 04:52:16,333 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,334 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,358 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,358 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,393 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,399 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,421 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,434 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 04:52:16,435 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 04:52:16,436 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 04:52:16,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 04:52:16,438 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (1/1) ... [2021-11-19 04:52:16,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 04:52:16,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:16,505 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 04:52:16,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 04:52:16,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-19 04:52:16,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 04:52:16,552 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-19 04:52:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-19 04:52:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-19 04:52:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-19 04:52:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-19 04:52:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-11-19 04:52:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_destroy [2021-11-19 04:52:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_append [2021-11-19 04:52:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-19 04:52:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-19 04:52:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-19 04:52:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-19 04:52:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-19 04:52:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-19 04:52:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 04:52:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-19 04:52:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-19 04:52:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-19 04:52:16,557 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-19 04:52:16,557 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-19 04:52:16,557 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-19 04:52:16,557 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-19 04:52:16,558 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-19 04:52:16,558 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-19 04:52:16,558 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-19 04:52:16,558 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-19 04:52:16,559 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-19 04:52:16,559 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-19 04:52:16,559 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-19 04:52:16,559 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-19 04:52:16,559 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-19 04:52:16,560 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-19 04:52:16,560 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-19 04:52:16,560 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-19 04:52:16,560 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-19 04:52:16,561 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-19 04:52:16,561 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-19 04:52:16,561 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-19 04:52:16,561 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-19 04:52:16,561 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-19 04:52:16,562 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-19 04:52:16,562 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-19 04:52:16,562 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-19 04:52:16,562 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-19 04:52:16,563 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-19 04:52:16,563 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-19 04:52:16,563 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-19 04:52:16,563 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-19 04:52:16,563 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-19 04:52:16,564 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-19 04:52:16,564 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-19 04:52:16,564 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-19 04:52:16,564 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-19 04:52:16,565 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-19 04:52:16,565 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-19 04:52:16,565 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-19 04:52:16,565 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-19 04:52:16,566 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-19 04:52:16,566 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-19 04:52:16,566 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-19 04:52:16,566 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-19 04:52:16,567 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-19 04:52:16,568 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-19 04:52:16,569 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-19 04:52:16,570 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-19 04:52:16,571 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-19 04:52:16,571 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-19 04:52:16,571 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-19 04:52:16,572 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-19 04:52:16,572 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-19 04:52:16,573 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-19 04:52:16,573 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-19 04:52:16,573 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-19 04:52:16,573 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-19 04:52:16,574 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-19 04:52:16,574 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-19 04:52:16,574 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-19 04:52:16,575 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-19 04:52:16,575 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-19 04:52:16,576 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-19 04:52:16,576 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-19 04:52:16,576 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-19 04:52:16,576 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-19 04:52:16,577 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-19 04:52:16,577 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-19 04:52:16,577 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-19 04:52:16,577 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-19 04:52:16,577 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-19 04:52:16,578 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-19 04:52:16,578 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-19 04:52:16,578 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-19 04:52:16,578 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-19 04:52:16,579 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-19 04:52:16,579 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-19 04:52:16,579 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-19 04:52:16,579 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-19 04:52:16,579 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-19 04:52:16,580 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-19 04:52:16,580 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-19 04:52:16,580 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-19 04:52:16,581 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-19 04:52:16,581 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-19 04:52:16,581 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-19 04:52:16,581 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-19 04:52:16,582 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-19 04:52:16,583 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-19 04:52:16,583 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-19 04:52:16,583 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-19 04:52:16,583 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-19 04:52:16,584 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-19 04:52:16,584 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-19 04:52:16,584 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-19 04:52:16,584 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-19 04:52:16,584 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-19 04:52:16,585 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-19 04:52:16,585 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-19 04:52:16,585 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-19 04:52:16,585 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-19 04:52:16,586 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-19 04:52:16,586 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-19 04:52:16,586 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-19 04:52:16,587 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-19 04:52:16,588 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-19 04:52:16,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-19 04:52:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-11-19 04:52:16,593 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_destroy [2021-11-19 04:52:16,593 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-19 04:52:16,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-19 04:52:16,595 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_append [2021-11-19 04:52:16,596 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-19 04:52:16,596 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-19 04:52:16,596 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-19 04:52:16,596 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-19 04:52:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-19 04:52:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 04:52:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 04:52:16,974 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 04:52:16,976 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 04:52:17,167 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-19 04:52:17,521 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 04:52:17,533 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 04:52:17,537 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-19 04:52:17,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:52:17 BoogieIcfgContainer [2021-11-19 04:52:17,541 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 04:52:17,544 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 04:52:17,544 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 04:52:17,551 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 04:52:17,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:52:15" (1/3) ... [2021-11-19 04:52:17,553 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58cca3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:52:17, skipping insertion in model container [2021-11-19 04:52:17,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:52:16" (2/3) ... [2021-11-19 04:52:17,554 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58cca3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:52:17, skipping insertion in model container [2021-11-19 04:52:17,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:52:17" (3/3) ... [2021-11-19 04:52:17,556 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_append_equal.i [2021-11-19 04:52:17,563 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 04:52:17,564 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2021-11-19 04:52:17,642 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 04:52:17,667 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, mAutomataTypeConcurrency=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 [2021-11-19 04:52:17,671 INFO L340 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2021-11-19 04:52:17,699 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 72 states have (on average 2.0) internal successors, (144), 132 states have internal predecessors, (144), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:17,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-19 04:52:17,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:17,710 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:17,711 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:17,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:17,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1464086698, now seen corresponding path program 1 times [2021-11-19 04:52:17,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:17,730 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279141980] [2021-11-19 04:52:17,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:17,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:17,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:18,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:18,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:18,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:18,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:18,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279141980] [2021-11-19 04:52:18,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279141980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:18,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:18,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:52:18,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006839721] [2021-11-19 04:52:18,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:18,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:52:18,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:18,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:52:18,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:52:18,108 INFO L87 Difference]: Start difference. First operand has 148 states, 72 states have (on average 2.0) internal successors, (144), 132 states have internal predecessors, (144), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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) [2021-11-19 04:52:18,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:18,603 INFO L93 Difference]: Finished difference Result 145 states and 154 transitions. [2021-11-19 04:52:18,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:52:18,606 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 [2021-11-19 04:52:18,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:18,625 INFO L225 Difference]: With dead ends: 145 [2021-11-19 04:52:18,625 INFO L226 Difference]: Without dead ends: 139 [2021-11-19 04:52:18,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:52:18,634 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 143 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:18,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 154 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 04:52:18,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-19 04:52:18,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-11-19 04:52:18,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 69 states have (on average 1.9130434782608696) internal successors, (132), 125 states have internal predecessors, (132), 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) [2021-11-19 04:52:18,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 147 transitions. [2021-11-19 04:52:18,735 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 147 transitions. Word has length 12 [2021-11-19 04:52:18,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:18,736 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 147 transitions. [2021-11-19 04:52:18,736 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) [2021-11-19 04:52:18,736 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 147 transitions. [2021-11-19 04:52:18,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-19 04:52:18,737 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:18,737 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:18,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 04:52:18,738 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:18,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:18,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1464086699, now seen corresponding path program 1 times [2021-11-19 04:52:18,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:18,739 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655246764] [2021-11-19 04:52:18,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:18,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:18,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:18,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:18,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:18,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:18,909 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:18,910 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655246764] [2021-11-19 04:52:18,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655246764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:18,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:18,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 04:52:18,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900846200] [2021-11-19 04:52:18,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:18,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 04:52:18,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:18,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 04:52:18,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 04:52:18,919 INFO L87 Difference]: Start difference. First operand 139 states and 147 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) [2021-11-19 04:52:19,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:19,273 INFO L93 Difference]: Finished difference Result 136 states and 144 transitions. [2021-11-19 04:52:19,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 04:52:19,274 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 [2021-11-19 04:52:19,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:19,281 INFO L225 Difference]: With dead ends: 136 [2021-11-19 04:52:19,281 INFO L226 Difference]: Without dead ends: 136 [2021-11-19 04:52:19,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:52:19,290 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 132 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:19,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 145 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:52:19,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-19 04:52:19,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-11-19 04:52:19,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 69 states have (on average 1.8695652173913044) internal successors, (129), 122 states have internal predecessors, (129), 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) [2021-11-19 04:52:19,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 144 transitions. [2021-11-19 04:52:19,322 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 144 transitions. Word has length 12 [2021-11-19 04:52:19,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:19,323 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 144 transitions. [2021-11-19 04:52:19,324 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) [2021-11-19 04:52:19,324 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 144 transitions. [2021-11-19 04:52:19,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 04:52:19,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:19,329 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:19,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 04:52:19,329 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:19,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:19,330 INFO L85 PathProgramCache]: Analyzing trace with hash 922902995, now seen corresponding path program 1 times [2021-11-19 04:52:19,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:19,331 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882491040] [2021-11-19 04:52:19,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:19,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:19,502 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:19,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:19,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:19,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:19,599 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:19,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882491040] [2021-11-19 04:52:19,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882491040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:19,600 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:19,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:19,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119358421] [2021-11-19 04:52:19,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:19,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 04:52:19,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:19,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 04:52:19,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 04:52:19,602 INFO L87 Difference]: Start difference. First operand 136 states and 144 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) [2021-11-19 04:52:20,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:20,293 INFO L93 Difference]: Finished difference Result 166 states and 177 transitions. [2021-11-19 04:52:20,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:52:20,293 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 [2021-11-19 04:52:20,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:20,296 INFO L225 Difference]: With dead ends: 166 [2021-11-19 04:52:20,296 INFO L226 Difference]: Without dead ends: 166 [2021-11-19 04:52:20,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:20,298 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 248 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:20,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 147 Invalid, 540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:52:20,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-19 04:52:20,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 137. [2021-11-19 04:52:20,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 70 states have (on average 1.8571428571428572) internal successors, (130), 123 states have internal predecessors, (130), 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) [2021-11-19 04:52:20,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 145 transitions. [2021-11-19 04:52:20,322 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 145 transitions. Word has length 20 [2021-11-19 04:52:20,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:20,323 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 145 transitions. [2021-11-19 04:52:20,326 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) [2021-11-19 04:52:20,327 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 145 transitions. [2021-11-19 04:52:20,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-19 04:52:20,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:20,328 INFO L514 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] [2021-11-19 04:52:20,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 04:52:20,329 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:20,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:20,330 INFO L85 PathProgramCache]: Analyzing trace with hash 89645992, now seen corresponding path program 1 times [2021-11-19 04:52:20,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:20,330 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614641330] [2021-11-19 04:52:20,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:20,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:20,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:20,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:20,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:20,496 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:20,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:20,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:20,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:20,582 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:52:20,582 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:20,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614641330] [2021-11-19 04:52:20,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614641330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:20,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:20,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:20,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220549526] [2021-11-19 04:52:20,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:20,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:20,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:20,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:20,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:20,587 INFO L87 Difference]: Start difference. First operand 137 states and 145 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) [2021-11-19 04:52:21,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:21,283 INFO L93 Difference]: Finished difference Result 156 states and 166 transitions. [2021-11-19 04:52:21,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:21,284 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 [2021-11-19 04:52:21,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:21,286 INFO L225 Difference]: With dead ends: 156 [2021-11-19 04:52:21,287 INFO L226 Difference]: Without dead ends: 156 [2021-11-19 04:52:21,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:21,289 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 188 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:21,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 136 Invalid, 716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:52:21,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-19 04:52:21,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 136. [2021-11-19 04:52:21,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 70 states have (on average 1.8428571428571427) internal successors, (129), 122 states have internal predecessors, (129), 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) [2021-11-19 04:52:21,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 144 transitions. [2021-11-19 04:52:21,318 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 144 transitions. Word has length 30 [2021-11-19 04:52:21,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:21,319 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 144 transitions. [2021-11-19 04:52:21,319 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) [2021-11-19 04:52:21,320 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 144 transitions. [2021-11-19 04:52:21,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-19 04:52:21,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:21,322 INFO L514 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] [2021-11-19 04:52:21,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 04:52:21,322 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:21,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:21,323 INFO L85 PathProgramCache]: Analyzing trace with hash 89645993, now seen corresponding path program 1 times [2021-11-19 04:52:21,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:21,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110403994] [2021-11-19 04:52:21,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:21,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:21,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:21,448 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:21,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:21,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:21,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:21,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:21,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:21,590 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:21,590 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:21,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110403994] [2021-11-19 04:52:21,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110403994] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:21,591 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:21,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:21,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515539827] [2021-11-19 04:52:21,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:21,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:21,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:21,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:21,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:21,595 INFO L87 Difference]: Start difference. First operand 136 states and 144 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) [2021-11-19 04:52:22,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:22,325 INFO L93 Difference]: Finished difference Result 155 states and 165 transitions. [2021-11-19 04:52:22,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:22,326 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 [2021-11-19 04:52:22,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:22,328 INFO L225 Difference]: With dead ends: 155 [2021-11-19 04:52:22,328 INFO L226 Difference]: Without dead ends: 155 [2021-11-19 04:52:22,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:22,330 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 185 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 688 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:22,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 136 Invalid, 710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 688 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:52:22,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-19 04:52:22,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 135. [2021-11-19 04:52:22,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 70 states have (on average 1.8285714285714285) internal successors, (128), 121 states have internal predecessors, (128), 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) [2021-11-19 04:52:22,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 143 transitions. [2021-11-19 04:52:22,342 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 143 transitions. Word has length 30 [2021-11-19 04:52:22,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:22,343 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 143 transitions. [2021-11-19 04:52:22,343 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) [2021-11-19 04:52:22,343 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 143 transitions. [2021-11-19 04:52:22,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-19 04:52:22,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:22,345 INFO L514 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] [2021-11-19 04:52:22,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-19 04:52:22,345 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:22,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:22,346 INFO L85 PathProgramCache]: Analyzing trace with hash 250452265, now seen corresponding path program 1 times [2021-11-19 04:52:22,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:22,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546250518] [2021-11-19 04:52:22,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:22,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:22,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:22,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:22,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:22,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:22,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:22,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:22,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:22,554 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:22,555 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:22,555 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546250518] [2021-11-19 04:52:22,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546250518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:22,555 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51777411] [2021-11-19 04:52:22,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:22,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:22,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:22,561 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:22,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 04:52:22,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:22,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 04:52:22,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:22,896 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 [2021-11-19 04:52:23,185 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-19 04:52:23,186 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 [2021-11-19 04:52:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:23,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:23,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51777411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:23,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:52:23,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-11-19 04:52:23,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837116124] [2021-11-19 04:52:23,545 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:23,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 04:52:23,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:23,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 04:52:23,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:52:23,547 INFO L87 Difference]: Start difference. First operand 135 states and 143 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) [2021-11-19 04:52:24,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:24,654 INFO L93 Difference]: Finished difference Result 159 states and 171 transitions. [2021-11-19 04:52:24,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 04:52:24,654 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 [2021-11-19 04:52:24,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:24,657 INFO L225 Difference]: With dead ends: 159 [2021-11-19 04:52:24,657 INFO L226 Difference]: Without dead ends: 159 [2021-11-19 04:52:24,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-11-19 04:52:24,661 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 269 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:24,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 108 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 774 Invalid, 0 Unknown, 99 Unchecked, 0.8s Time] [2021-11-19 04:52:24,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-19 04:52:24,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 140. [2021-11-19 04:52:24,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 74 states have (on average 1.8108108108108107) internal successors, (134), 125 states have internal predecessors, (134), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:24,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 151 transitions. [2021-11-19 04:52:24,694 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 151 transitions. Word has length 32 [2021-11-19 04:52:24,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:24,694 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 151 transitions. [2021-11-19 04:52:24,694 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) [2021-11-19 04:52:24,695 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 151 transitions. [2021-11-19 04:52:24,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-19 04:52:24,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:24,696 INFO L514 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] [2021-11-19 04:52:24,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:24,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-19 04:52:24,917 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:24,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:24,918 INFO L85 PathProgramCache]: Analyzing trace with hash 250452266, now seen corresponding path program 1 times [2021-11-19 04:52:24,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:24,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138555082] [2021-11-19 04:52:24,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:24,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:24,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:25,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:25,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:25,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:25,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:25,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:25,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:25,326 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:25,326 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:25,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138555082] [2021-11-19 04:52:25,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138555082] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:25,327 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427240456] [2021-11-19 04:52:25,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:25,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:25,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:25,329 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:25,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 04:52:25,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:25,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-19 04:52:25,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:25,546 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 [2021-11-19 04:52:25,552 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 [2021-11-19 04:52:25,959 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-19 04:52:25,959 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 [2021-11-19 04:52:25,975 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-19 04:52:25,975 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 [2021-11-19 04:52:26,117 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:52:26,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:26,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427240456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:26,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:52:26,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-19 04:52:26,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876764786] [2021-11-19 04:52:26,283 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:26,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:52:26,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:26,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:52:26,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-19 04:52:26,286 INFO L87 Difference]: Start difference. First operand 140 states and 151 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) [2021-11-19 04:52:27,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:27,533 INFO L93 Difference]: Finished difference Result 159 states and 170 transitions. [2021-11-19 04:52:27,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 04:52:27,534 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 [2021-11-19 04:52:27,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:27,536 INFO L225 Difference]: With dead ends: 159 [2021-11-19 04:52:27,536 INFO L226 Difference]: Without dead ends: 159 [2021-11-19 04:52:27,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-19 04:52:27,538 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 292 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 826 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 826 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:27,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 116 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 826 Invalid, 0 Unknown, 164 Unchecked, 0.9s Time] [2021-11-19 04:52:27,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-19 04:52:27,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 140. [2021-11-19 04:52:27,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 74 states have (on average 1.7972972972972974) internal successors, (133), 125 states have internal predecessors, (133), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:27,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2021-11-19 04:52:27,547 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 32 [2021-11-19 04:52:27,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:27,547 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2021-11-19 04:52:27,547 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) [2021-11-19 04:52:27,548 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2021-11-19 04:52:27,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-19 04:52:27,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:27,553 INFO L514 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] [2021-11-19 04:52:27,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:27,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-19 04:52:27,771 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:27,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:27,772 INFO L85 PathProgramCache]: Analyzing trace with hash 166612383, now seen corresponding path program 1 times [2021-11-19 04:52:27,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:27,772 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728654685] [2021-11-19 04:52:27,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:27,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:27,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:27,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:27,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:27,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:27,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:27,954 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:27,954 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:27,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728654685] [2021-11-19 04:52:27,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728654685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:27,955 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617908726] [2021-11-19 04:52:27,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:27,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:27,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:27,956 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:27,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 04:52:28,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:28,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 04:52:28,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:28,264 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:28,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:28,440 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:28,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617908726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:52:28,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:52:28,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 8 [2021-11-19 04:52:28,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329256540] [2021-11-19 04:52:28,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:28,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:28,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:28,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:28,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:28,444 INFO L87 Difference]: Start difference. First operand 140 states and 150 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) [2021-11-19 04:52:29,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:29,152 INFO L93 Difference]: Finished difference Result 160 states and 170 transitions. [2021-11-19 04:52:29,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:29,153 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 [2021-11-19 04:52:29,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:29,155 INFO L225 Difference]: With dead ends: 160 [2021-11-19 04:52:29,155 INFO L226 Difference]: Without dead ends: 160 [2021-11-19 04:52:29,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:29,156 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 176 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:29,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 151 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:52:29,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-19 04:52:29,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 140. [2021-11-19 04:52:29,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 74 states have (on average 1.7837837837837838) internal successors, (132), 125 states have internal predecessors, (132), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:29,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 149 transitions. [2021-11-19 04:52:29,166 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 149 transitions. Word has length 34 [2021-11-19 04:52:29,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:29,168 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 149 transitions. [2021-11-19 04:52:29,168 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) [2021-11-19 04:52:29,168 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 149 transitions. [2021-11-19 04:52:29,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-19 04:52:29,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:29,178 INFO L514 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] [2021-11-19 04:52:29,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:29,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:29,402 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:29,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:29,402 INFO L85 PathProgramCache]: Analyzing trace with hash 865235919, now seen corresponding path program 1 times [2021-11-19 04:52:29,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:29,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511950460] [2021-11-19 04:52:29,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:29,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:29,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:29,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:29,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:29,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:29,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:29,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:29,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:29,505 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 04:52:29,506 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:29,506 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511950460] [2021-11-19 04:52:29,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511950460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:29,506 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35656941] [2021-11-19 04:52:29,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:29,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:29,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:29,508 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:29,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 04:52:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:29,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 04:52:29,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:29,778 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 04:52:29,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:29,800 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-19 04:52:29,801 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 12 treesize of output 11 [2021-11-19 04:52:29,893 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 04:52:29,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35656941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:52:29,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:52:29,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 6 [2021-11-19 04:52:29,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578034542] [2021-11-19 04:52:29,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:29,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 04:52:29,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:29,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 04:52:29,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-19 04:52:29,897 INFO L87 Difference]: Start difference. First operand 140 states and 149 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) [2021-11-19 04:52:30,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:30,509 INFO L93 Difference]: Finished difference Result 164 states and 176 transitions. [2021-11-19 04:52:30,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:30,510 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 [2021-11-19 04:52:30,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:30,512 INFO L225 Difference]: With dead ends: 164 [2021-11-19 04:52:30,512 INFO L226 Difference]: Without dead ends: 164 [2021-11-19 04:52:30,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-19 04:52:30,514 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 189 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:30,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 140 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:52:30,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-19 04:52:30,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 143. [2021-11-19 04:52:30,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 77 states have (on average 1.7792207792207793) internal successors, (137), 128 states have internal predecessors, (137), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:30,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 154 transitions. [2021-11-19 04:52:30,523 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 154 transitions. Word has length 35 [2021-11-19 04:52:30,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:30,523 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 154 transitions. [2021-11-19 04:52:30,523 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) [2021-11-19 04:52:30,524 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 154 transitions. [2021-11-19 04:52:30,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-19 04:52:30,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:30,525 INFO L514 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] [2021-11-19 04:52:30,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:30,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-19 04:52:30,745 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:30,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:30,746 INFO L85 PathProgramCache]: Analyzing trace with hash 865235920, now seen corresponding path program 1 times [2021-11-19 04:52:30,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:30,746 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562299916] [2021-11-19 04:52:30,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:30,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:30,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:30,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:30,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:30,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:30,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:30,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:30,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:30,978 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:30,979 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:30,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562299916] [2021-11-19 04:52:30,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562299916] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:30,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68464826] [2021-11-19 04:52:30,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:30,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:30,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:30,981 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:30,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 04:52:31,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:31,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 04:52:31,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:31,413 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:31,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:31,496 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:52:31,497 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 23 [2021-11-19 04:52:31,742 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:31,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68464826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 04:52:31,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 04:52:31,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 16 [2021-11-19 04:52:31,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427115381] [2021-11-19 04:52:31,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:31,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-19 04:52:31,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:31,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-19 04:52:31,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-11-19 04:52:31,746 INFO L87 Difference]: Start difference. First operand 143 states and 154 transitions. Second operand has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 04:52:32,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:32,951 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2021-11-19 04:52:32,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 04:52:32,951 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 35 [2021-11-19 04:52:32,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:32,954 INFO L225 Difference]: With dead ends: 169 [2021-11-19 04:52:32,954 INFO L226 Difference]: Without dead ends: 169 [2021-11-19 04:52:32,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2021-11-19 04:52:32,955 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 207 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 1365 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 1395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:32,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 192 Invalid, 1395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1365 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 04:52:32,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-19 04:52:32,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 143. [2021-11-19 04:52:32,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 77 states have (on average 1.7662337662337662) internal successors, (136), 128 states have internal predecessors, (136), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:32,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 153 transitions. [2021-11-19 04:52:32,965 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 153 transitions. Word has length 35 [2021-11-19 04:52:32,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:32,965 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 153 transitions. [2021-11-19 04:52:32,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-19 04:52:32,966 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 153 transitions. [2021-11-19 04:52:32,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-19 04:52:32,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:32,967 INFO L514 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] [2021-11-19 04:52:33,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:33,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:33,182 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:33,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:33,182 INFO L85 PathProgramCache]: Analyzing trace with hash 1052509723, now seen corresponding path program 1 times [2021-11-19 04:52:33,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:33,183 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640099356] [2021-11-19 04:52:33,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:33,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:33,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:33,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:33,291 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:33,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:33,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:33,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:33,334 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:52:33,334 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:33,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640099356] [2021-11-19 04:52:33,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640099356] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:33,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:33,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-19 04:52:33,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237787355] [2021-11-19 04:52:33,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:33,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:52:33,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:33,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:52:33,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:52:33,340 INFO L87 Difference]: Start difference. First operand 143 states and 153 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) [2021-11-19 04:52:34,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:34,047 INFO L93 Difference]: Finished difference Result 162 states and 173 transitions. [2021-11-19 04:52:34,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:52:34,048 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 [2021-11-19 04:52:34,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:34,050 INFO L225 Difference]: With dead ends: 162 [2021-11-19 04:52:34,050 INFO L226 Difference]: Without dead ends: 162 [2021-11-19 04:52:34,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:52:34,051 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 188 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 812 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:34,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 140 Invalid, 838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 812 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 04:52:34,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-19 04:52:34,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 142. [2021-11-19 04:52:34,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 77 states have (on average 1.7532467532467533) internal successors, (135), 127 states have internal predecessors, (135), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:34,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2021-11-19 04:52:34,060 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 36 [2021-11-19 04:52:34,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:34,060 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2021-11-19 04:52:34,061 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) [2021-11-19 04:52:34,061 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2021-11-19 04:52:34,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-19 04:52:34,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:34,062 INFO L514 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] [2021-11-19 04:52:34,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 04:52:34,063 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:34,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:34,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1052509724, now seen corresponding path program 1 times [2021-11-19 04:52:34,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:34,064 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287699505] [2021-11-19 04:52:34,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:34,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:34,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:34,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:34,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:34,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:34,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:34,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:34,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:34,238 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:52:34,239 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:34,239 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287699505] [2021-11-19 04:52:34,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287699505] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:34,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:34,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-19 04:52:34,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398787422] [2021-11-19 04:52:34,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:34,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:52:34,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:34,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:52:34,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:52:34,242 INFO L87 Difference]: Start difference. First operand 142 states and 152 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) [2021-11-19 04:52:35,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:35,031 INFO L93 Difference]: Finished difference Result 160 states and 171 transitions. [2021-11-19 04:52:35,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:52:35,031 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 [2021-11-19 04:52:35,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:35,033 INFO L225 Difference]: With dead ends: 160 [2021-11-19 04:52:35,033 INFO L226 Difference]: Without dead ends: 160 [2021-11-19 04:52:35,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:52:35,034 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 184 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 808 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:35,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 140 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 808 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 04:52:35,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-19 04:52:35,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 141. [2021-11-19 04:52:35,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 77 states have (on average 1.7402597402597402) internal successors, (134), 126 states have internal predecessors, (134), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 04:52:35,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 151 transitions. [2021-11-19 04:52:35,043 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 151 transitions. Word has length 36 [2021-11-19 04:52:35,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:35,043 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 151 transitions. [2021-11-19 04:52:35,044 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) [2021-11-19 04:52:35,044 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 151 transitions. [2021-11-19 04:52:35,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-19 04:52:35,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:35,045 INFO L514 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] [2021-11-19 04:52:35,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-19 04:52:35,045 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:35,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:35,046 INFO L85 PathProgramCache]: Analyzing trace with hash 803639589, now seen corresponding path program 1 times [2021-11-19 04:52:35,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:35,046 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146139218] [2021-11-19 04:52:35,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:35,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:35,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:35,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-19 04:52:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-19 04:52:35,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-11-19 04:52:35,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,178 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-19 04:52:35,178 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:35,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146139218] [2021-11-19 04:52:35,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146139218] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:35,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596878513] [2021-11-19 04:52:35,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:35,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:35,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:35,182 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:35,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 04:52:35,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 04:52:35,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:35,545 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 04:52:35,545 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-19 04:52:35,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596878513] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:35,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 04:52:35,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-19 04:52:35,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019814070] [2021-11-19 04:52:35,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:35,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 04:52:35,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:35,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 04:52:35,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-19 04:52:35,549 INFO L87 Difference]: Start difference. First operand 141 states and 151 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) [2021-11-19 04:52:35,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:35,603 INFO L93 Difference]: Finished difference Result 129 states and 135 transitions. [2021-11-19 04:52:35,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 04:52:35,603 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 [2021-11-19 04:52:35,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:35,608 INFO L225 Difference]: With dead ends: 129 [2021-11-19 04:52:35,608 INFO L226 Difference]: Without dead ends: 129 [2021-11-19 04:52:35,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:35,611 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 44 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:35,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 583 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 04:52:35,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-19 04:52:35,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-11-19 04:52:35,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 70 states have (on average 1.7142857142857142) internal successors, (120), 115 states have internal predecessors, (120), 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) [2021-11-19 04:52:35,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 135 transitions. [2021-11-19 04:52:35,620 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 135 transitions. Word has length 47 [2021-11-19 04:52:35,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:35,622 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 135 transitions. [2021-11-19 04:52:35,622 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) [2021-11-19 04:52:35,623 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 135 transitions. [2021-11-19 04:52:35,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-19 04:52:35,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:35,624 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:35,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 04:52:35,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-19 04:52:35,849 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_appendErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:35,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:35,850 INFO L85 PathProgramCache]: Analyzing trace with hash -1207953520, now seen corresponding path program 1 times [2021-11-19 04:52:35,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:35,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854653287] [2021-11-19 04:52:35,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:35,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:35,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:35,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:35,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:36,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:36,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:36,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:36,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,577 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-19 04:52:36,577 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:36,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854653287] [2021-11-19 04:52:36,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854653287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:36,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855076517] [2021-11-19 04:52:36,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:36,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:36,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:36,581 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:36,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 04:52:36,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:36,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-19 04:52:36,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:36,803 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 [2021-11-19 04:52:36,819 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 11 treesize of output 9 [2021-11-19 04:52:37,431 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-11-19 04:52:37,432 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 23 treesize of output 22 [2021-11-19 04:52:37,649 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 04:52:37,650 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 15 [2021-11-19 04:52:37,764 INFO L354 Elim1Store]: treesize reduction 36, result has 23.4 percent of original size [2021-11-19 04:52:37,765 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 3 case distinctions, treesize of input 27 treesize of output 32 [2021-11-19 04:52:37,846 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-19 04:52:37,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:48,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855076517] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:48,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:52:48,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-11-19 04:52:48,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030246522] [2021-11-19 04:52:48,071 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:48,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 04:52:48,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:48,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 04:52:48,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=608, Unknown=4, NotChecked=0, Total=702 [2021-11-19 04:52:48,074 INFO L87 Difference]: Start difference. First operand 129 states and 135 transitions. Second operand has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:52:49,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:49,404 INFO L93 Difference]: Finished difference Result 145 states and 152 transitions. [2021-11-19 04:52:49,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-19 04:52:49,405 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 53 [2021-11-19 04:52:49,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:49,406 INFO L225 Difference]: With dead ends: 145 [2021-11-19 04:52:49,406 INFO L226 Difference]: Without dead ends: 145 [2021-11-19 04:52:49,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=161, Invalid=1095, Unknown=4, NotChecked=0, Total=1260 [2021-11-19 04:52:49,408 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 229 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1014 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 471 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:49,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 192 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1014 Invalid, 0 Unknown, 471 Unchecked, 0.9s Time] [2021-11-19 04:52:49,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-19 04:52:49,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 124. [2021-11-19 04:52:49,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 70 states have (on average 1.6428571428571428) internal successors, (115), 110 states have internal predecessors, (115), 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) [2021-11-19 04:52:49,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 130 transitions. [2021-11-19 04:52:49,416 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 130 transitions. Word has length 53 [2021-11-19 04:52:49,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:49,417 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 130 transitions. [2021-11-19 04:52:49,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.869565217391304) internal successors, (66), 21 states have internal predecessors, (66), 9 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:52:49,417 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 130 transitions. [2021-11-19 04:52:49,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-19 04:52:49,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:49,418 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:49,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-19 04:52:49,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:49,634 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_circular_appendErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:49,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:49,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1207953519, now seen corresponding path program 1 times [2021-11-19 04:52:49,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:49,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139288653] [2021-11-19 04:52:49,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:49,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:49,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:49,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:49,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:49,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:49,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:50,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:50,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:50,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:50,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:50,295 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:50,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:50,342 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-19 04:52:50,343 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:50,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139288653] [2021-11-19 04:52:50,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139288653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:50,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151390502] [2021-11-19 04:52:50,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:50,344 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:50,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:50,345 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:50,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 04:52:50,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:50,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-19 04:52:50,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:50,542 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 [2021-11-19 04:52:50,569 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 11 treesize of output 9 [2021-11-19 04:52:51,349 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-11-19 04:52:51,350 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 29 [2021-11-19 04:52:51,683 INFO L354 Elim1Store]: treesize reduction 32, result has 31.9 percent of original size [2021-11-19 04:52:51,684 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 3 case distinctions, treesize of input 22 treesize of output 31 [2021-11-19 04:52:51,800 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:52:51,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:52:51,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151390502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:51,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:52:51,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-11-19 04:52:51,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809727989] [2021-11-19 04:52:51,927 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:52:51,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 04:52:51,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:51,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 04:52:51,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-19 04:52:51,930 INFO L87 Difference]: Start difference. First operand 124 states and 130 transitions. Second operand has 24 states, 20 states have (on average 3.5) internal successors, (70), 19 states have internal predecessors, (70), 9 states have call successors, (13), 6 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:52:52,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:52,924 INFO L93 Difference]: Finished difference Result 143 states and 150 transitions. [2021-11-19 04:52:52,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-19 04:52:52,936 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 20 states have (on average 3.5) internal successors, (70), 19 states have internal predecessors, (70), 9 states have call successors, (13), 6 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 53 [2021-11-19 04:52:52,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:52,938 INFO L225 Difference]: With dead ends: 143 [2021-11-19 04:52:52,938 INFO L226 Difference]: Without dead ends: 143 [2021-11-19 04:52:52,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=182, Invalid=1078, Unknown=0, NotChecked=0, Total=1260 [2021-11-19 04:52:52,939 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 192 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 1309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 527 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:52,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 256 Invalid, 1309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 750 Invalid, 0 Unknown, 527 Unchecked, 0.7s Time] [2021-11-19 04:52:52,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-19 04:52:52,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 123. [2021-11-19 04:52:52,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 70 states have (on average 1.6285714285714286) internal successors, (114), 109 states have internal predecessors, (114), 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) [2021-11-19 04:52:52,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 129 transitions. [2021-11-19 04:52:52,950 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 129 transitions. Word has length 53 [2021-11-19 04:52:52,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:52,950 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 129 transitions. [2021-11-19 04:52:52,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 20 states have (on average 3.5) internal successors, (70), 19 states have internal predecessors, (70), 9 states have call successors, (13), 6 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-19 04:52:52,951 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 129 transitions. [2021-11-19 04:52:52,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:52:52,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:52,952 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:52,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-19 04:52:53,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-19 04:52:53,165 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_circular_appendErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:53,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:53,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1202159599, now seen corresponding path program 1 times [2021-11-19 04:52:53,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:53,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386404956] [2021-11-19 04:52:53,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:53,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:53,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:53,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:53,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:53,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:53,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,292 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:52:53,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:53,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386404956] [2021-11-19 04:52:53,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386404956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:53,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:53,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:53,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995656550] [2021-11-19 04:52:53,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:53,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:53,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:53,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:53,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:53,303 INFO L87 Difference]: Start difference. First operand 123 states and 129 transitions. Second operand has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:53,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:53,907 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2021-11-19 04:52:53,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:53,908 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-19 04:52:53,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:53,909 INFO L225 Difference]: With dead ends: 138 [2021-11-19 04:52:53,909 INFO L226 Difference]: Without dead ends: 138 [2021-11-19 04:52:53,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:53,910 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 184 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:53,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 104 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 585 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:52:53,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-19 04:52:53,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2021-11-19 04:52:53,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 70 states have (on average 1.5714285714285714) internal successors, (110), 105 states have internal predecessors, (110), 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) [2021-11-19 04:52:53,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 125 transitions. [2021-11-19 04:52:53,920 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 125 transitions. Word has length 55 [2021-11-19 04:52:53,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:53,921 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 125 transitions. [2021-11-19 04:52:53,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 5 states have internal predecessors, (34), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:53,922 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 125 transitions. [2021-11-19 04:52:53,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:52:53,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:53,923 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:53,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-19 04:52:53,924 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_circular_appendErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:53,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:53,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1202159598, now seen corresponding path program 1 times [2021-11-19 04:52:53,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:53,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862100969] [2021-11-19 04:52:53,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:53,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:53,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:53,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:53,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:54,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:54,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:54,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,100 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 04:52:54,102 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:54,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862100969] [2021-11-19 04:52:54,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862100969] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:54,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:54,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:54,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225212345] [2021-11-19 04:52:54,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:54,104 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:54,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:54,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:54,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:54,106 INFO L87 Difference]: Start difference. First operand 119 states and 125 transitions. Second operand has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:54,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:54,725 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2021-11-19 04:52:54,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:52:54,725 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-19 04:52:54,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:54,726 INFO L225 Difference]: With dead ends: 134 [2021-11-19 04:52:54,726 INFO L226 Difference]: Without dead ends: 134 [2021-11-19 04:52:54,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:52:54,728 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 175 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:54,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 102 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 04:52:54,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-19 04:52:54,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 115. [2021-11-19 04:52:54,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 70 states have (on average 1.5142857142857142) internal successors, (106), 101 states have internal predecessors, (106), 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) [2021-11-19 04:52:54,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 121 transitions. [2021-11-19 04:52:54,733 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 121 transitions. Word has length 55 [2021-11-19 04:52:54,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:54,734 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 121 transitions. [2021-11-19 04:52:54,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 5 states have internal predecessors, (36), 1 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:54,735 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 121 transitions. [2021-11-19 04:52:54,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:52:54,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:54,735 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:54,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-19 04:52:54,736 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_circular_appendErr9REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:54,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:54,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1202159246, now seen corresponding path program 1 times [2021-11-19 04:52:54,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:54,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075204076] [2021-11-19 04:52:54,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:54,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:54,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:54,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:54,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:54,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:54,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:54,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:54,890 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-19 04:52:54,890 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:54,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075204076] [2021-11-19 04:52:54,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075204076] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:54,891 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:54,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:52:54,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142549758] [2021-11-19 04:52:54,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:54,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:52:54,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:54,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:52:54,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:52:54,893 INFO L87 Difference]: Start difference. First operand 115 states and 121 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-19 04:52:55,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:55,363 INFO L93 Difference]: Finished difference Result 130 states and 137 transitions. [2021-11-19 04:52:55,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:52:55,363 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 55 [2021-11-19 04:52:55,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:55,365 INFO L225 Difference]: With dead ends: 130 [2021-11-19 04:52:55,365 INFO L226 Difference]: Without dead ends: 130 [2021-11-19 04:52:55,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-19 04:52:55,366 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 242 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:55,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 100 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 04:52:55,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-19 04:52:55,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 111. [2021-11-19 04:52:55,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 70 states have (on average 1.457142857142857) internal successors, (102), 97 states have internal predecessors, (102), 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) [2021-11-19 04:52:55,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 117 transitions. [2021-11-19 04:52:55,373 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 117 transitions. Word has length 55 [2021-11-19 04:52:55,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:55,373 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 117 transitions. [2021-11-19 04:52:55,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 5 states have internal predecessors, (29), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-19 04:52:55,374 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 117 transitions. [2021-11-19 04:52:55,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-19 04:52:55,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:55,375 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:55,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-19 04:52:55,376 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_circular_appendErr8REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:55,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:55,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1202159247, now seen corresponding path program 1 times [2021-11-19 04:52:55,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:55,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150705034] [2021-11-19 04:52:55,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:55,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:55,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:55,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:55,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:55,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:55,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:55,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-19 04:52:55,476 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:55,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150705034] [2021-11-19 04:52:55,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150705034] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:52:55,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:52:55,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 04:52:55,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891169980] [2021-11-19 04:52:55,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:52:55,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 04:52:55,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:52:55,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 04:52:55,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 04:52:55,481 INFO L87 Difference]: Start difference. First operand 111 states and 117 transitions. Second operand has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:55,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:52:55,786 INFO L93 Difference]: Finished difference Result 128 states and 135 transitions. [2021-11-19 04:52:55,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 04:52:55,797 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 55 [2021-11-19 04:52:55,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:52:55,798 INFO L225 Difference]: With dead ends: 128 [2021-11-19 04:52:55,798 INFO L226 Difference]: Without dead ends: 128 [2021-11-19 04:52:55,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-19 04:52:55,799 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 162 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:52:55,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 89 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 04:52:55,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-19 04:52:55,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 109. [2021-11-19 04:52:55,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 95 states have internal predecessors, (100), 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) [2021-11-19 04:52:55,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 115 transitions. [2021-11-19 04:52:55,805 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 115 transitions. Word has length 55 [2021-11-19 04:52:55,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:52:55,805 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 115 transitions. [2021-11-19 04:52:55,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-19 04:52:55,806 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 115 transitions. [2021-11-19 04:52:55,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 04:52:55,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:52:55,807 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:52:55,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-19 04:52:55,807 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_circular_appendErr10REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:52:55,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:52:55,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1387769122, now seen corresponding path program 1 times [2021-11-19 04:52:55,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:52:55,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637262757] [2021-11-19 04:52:55,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:55,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:52:55,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,954 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:52:55,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:55,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:52:55,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:56,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:52:56,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:56,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:52:56,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:56,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:52:56,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:56,451 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 04:52:56,451 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:52:56,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637262757] [2021-11-19 04:52:56,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637262757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:52:56,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177963510] [2021-11-19 04:52:56,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:52:56,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:52:56,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:52:56,453 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:52:56,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 04:52:56,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:52:56,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-19 04:52:56,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:52:56,693 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 [2021-11-19 04:52:56,980 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 13 treesize of output 9 [2021-11-19 04:53:07,028 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-19 04:53:07,029 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 3 case distinctions, treesize of input 48 treesize of output 40 [2021-11-19 04:53:07,055 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-19 04:53:07,056 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 37 treesize of output 39 [2021-11-19 04:53:09,281 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-19 04:53:09,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 43 treesize of output 25 [2021-11-19 04:53:09,302 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:09,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:53:11,434 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_node_create_~temp~0.base_49 Int) (v_node_create_~temp~0.offset_45 Int) (v_DerPreprocessor_1 Int)) (or (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_49) (= (select (store |c_#valid| v_node_create_~temp~0.base_49 1) (select (select (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_49 (store (store (store (select |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_49) v_node_create_~temp~0.offset_45 0) (+ v_node_create_~temp~0.offset_45 4) 0) (+ v_node_create_~temp~0.offset_45 8) v_DerPreprocessor_1)) c_dll_circular_append_~head.base) c_dll_circular_append_~head.offset)) 1))) is different from false [2021-11-19 04:53:11,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177963510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:11,436 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:53:11,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 30 [2021-11-19 04:53:11,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466188977] [2021-11-19 04:53:11,437 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:53:11,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-19 04:53:11,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:53:11,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-19 04:53:11,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=842, Unknown=7, NotChecked=58, Total=992 [2021-11-19 04:53:11,439 INFO L87 Difference]: Start difference. First operand 109 states and 115 transitions. Second operand has 31 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 23 states have internal predecessors, (62), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-19 04:53:25,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:25,905 INFO L93 Difference]: Finished difference Result 127 states and 134 transitions. [2021-11-19 04:53:25,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-19 04:53:25,905 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 23 states have internal predecessors, (62), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 56 [2021-11-19 04:53:25,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:25,906 INFO L225 Difference]: With dead ends: 127 [2021-11-19 04:53:25,907 INFO L226 Difference]: Without dead ends: 127 [2021-11-19 04:53:25,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 27.7s TimeCoverageRelationStatistics Valid=203, Invalid=2043, Unknown=14, NotChecked=92, Total=2352 [2021-11-19 04:53:25,909 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 182 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 1600 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 1918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:25,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 220 Invalid, 1918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1600 Invalid, 0 Unknown, 266 Unchecked, 1.3s Time] [2021-11-19 04:53:25,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-19 04:53:25,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 108. [2021-11-19 04:53:25,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 70 states have (on average 1.4142857142857144) internal successors, (99), 94 states have internal predecessors, (99), 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) [2021-11-19 04:53:25,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 114 transitions. [2021-11-19 04:53:25,915 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 114 transitions. Word has length 56 [2021-11-19 04:53:25,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:25,915 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 114 transitions. [2021-11-19 04:53:25,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 23 states have internal predecessors, (62), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-19 04:53:25,916 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 114 transitions. [2021-11-19 04:53:25,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 04:53:25,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:25,917 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:53:25,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-19 04:53:26,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:26,130 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_circular_appendErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:53:26,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:26,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1387769123, now seen corresponding path program 1 times [2021-11-19 04:53:26,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:26,131 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732557006] [2021-11-19 04:53:26,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:26,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:26,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:26,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:26,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:26,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:26,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:26,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:53:26,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:26,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:53:26,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:26,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:53:26,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:27,599 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:53:27,600 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:27,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732557006] [2021-11-19 04:53:27,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732557006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:27,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543710338] [2021-11-19 04:53:27,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:27,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:27,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:27,607 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:27,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 04:53:27,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:27,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-19 04:53:27,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:27,838 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 [2021-11-19 04:53:27,843 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 [2021-11-19 04:53:28,728 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 38 treesize of output 30 [2021-11-19 04:53:28,734 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 20 treesize of output 12 [2021-11-19 04:53:37,344 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-19 04:53:37,345 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 3 case distinctions, treesize of input 105 treesize of output 93 [2021-11-19 04:53:37,431 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-19 04:53:37,431 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 3 case distinctions, treesize of input 94 treesize of output 82 [2021-11-19 04:53:37,447 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-19 04:53:37,447 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 83 treesize of output 85 [2021-11-19 04:53:37,460 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-19 04:53:37,460 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 82 treesize of output 82 [2021-11-19 04:53:37,845 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-19 04:53:37,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 90 treesize of output 68 [2021-11-19 04:53:37,855 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-19 04:53:37,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 37 [2021-11-19 04:53:37,954 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:53:37,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:53:40,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543710338] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:40,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:53:40,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 39 [2021-11-19 04:53:40,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715017912] [2021-11-19 04:53:40,977 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:53:40,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-19 04:53:40,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:53:40,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-19 04:53:40,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1678, Unknown=5, NotChecked=0, Total=1806 [2021-11-19 04:53:40,979 INFO L87 Difference]: Start difference. First operand 108 states and 114 transitions. Second operand has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:53:53,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:53:53,098 INFO L93 Difference]: Finished difference Result 126 states and 133 transitions. [2021-11-19 04:53:53,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 04:53:53,099 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 56 [2021-11-19 04:53:53,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:53:53,100 INFO L225 Difference]: With dead ends: 126 [2021-11-19 04:53:53,100 INFO L226 Difference]: Without dead ends: 126 [2021-11-19 04:53:53,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=271, Invalid=3380, Unknown=9, NotChecked=0, Total=3660 [2021-11-19 04:53:53,102 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 213 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 2077 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 2419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 2077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 284 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-19 04:53:53,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 302 Invalid, 2419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 2077 Invalid, 0 Unknown, 284 Unchecked, 2.1s Time] [2021-11-19 04:53:53,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-19 04:53:53,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 107. [2021-11-19 04:53:53,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 70 states have (on average 1.4) internal successors, (98), 93 states have internal predecessors, (98), 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) [2021-11-19 04:53:53,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2021-11-19 04:53:53,109 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 56 [2021-11-19 04:53:53,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:53:53,109 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2021-11-19 04:53:53,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 33 states have (on average 2.393939393939394) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:53:53,110 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2021-11-19 04:53:53,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-19 04:53:53,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:53:53,111 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:53:53,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-19 04:53:53,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:53,337 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_circular_appendErr12REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:53:53,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:53:53,338 INFO L85 PathProgramCache]: Analyzing trace with hash -2088699037, now seen corresponding path program 1 times [2021-11-19 04:53:53,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:53:53,338 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726203421] [2021-11-19 04:53:53,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:53,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:53:53,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:53:53,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:53:53,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:53:53,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:53,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:53:53,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:54,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:53:54,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:55,334 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:53:55,334 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:53:55,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726203421] [2021-11-19 04:53:55,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726203421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:53:55,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589613501] [2021-11-19 04:53:55,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:53:55,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:53:55,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:53:55,338 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:53:55,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 04:53:55,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:53:55,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-19 04:53:55,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:53:55,560 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 [2021-11-19 04:53:55,845 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 [2021-11-19 04:53:56,272 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:53:56,273 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 32 treesize of output 35 [2021-11-19 04:53:56,279 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 28 [2021-11-19 04:53:56,285 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 04:53:56,285 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 28 treesize of output 24 [2021-11-19 04:54:03,039 INFO L354 Elim1Store]: treesize reduction 394, result has 8.6 percent of original size [2021-11-19 04:54:03,040 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 3 new quantified variables, introduced 5 case distinctions, treesize of input 99 treesize of output 93 [2021-11-19 04:54:03,094 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-19 04:54:03,094 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 3 case distinctions, treesize of input 88 treesize of output 80 [2021-11-19 04:54:03,130 INFO L354 Elim1Store]: treesize reduction 116, result has 32.2 percent of original size [2021-11-19 04:54:03,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 77 treesize of output 106 [2021-11-19 04:54:03,479 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-19 04:54:03,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 111 treesize of output 89 [2021-11-19 04:54:03,699 INFO L354 Elim1Store]: treesize reduction 67, result has 17.3 percent of original size [2021-11-19 04:54:03,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 55 [2021-11-19 04:54:03,906 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 04:54:03,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:54:04,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589613501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:54:04,482 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:54:04,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 45 [2021-11-19 04:54:04,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296559340] [2021-11-19 04:54:04,482 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:54:04,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 04:54:04,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:04,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 04:54:04,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2213, Unknown=3, NotChecked=0, Total=2352 [2021-11-19 04:54:04,485 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:54:16,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:16,922 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2021-11-19 04:54:16,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-19 04:54:16,924 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) Word has length 58 [2021-11-19 04:54:16,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:16,926 INFO L225 Difference]: With dead ends: 125 [2021-11-19 04:54:16,926 INFO L226 Difference]: Without dead ends: 125 [2021-11-19 04:54:16,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=315, Invalid=4508, Unknown=7, NotChecked=0, Total=4830 [2021-11-19 04:54:16,929 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 188 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 2705 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 3135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 2705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 375 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:16,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 328 Invalid, 3135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 2705 Invalid, 0 Unknown, 375 Unchecked, 2.4s Time] [2021-11-19 04:54:16,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-19 04:54:16,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 106. [2021-11-19 04:54:16,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 70 states have (on average 1.3857142857142857) internal successors, (97), 92 states have internal predecessors, (97), 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) [2021-11-19 04:54:16,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 112 transitions. [2021-11-19 04:54:16,934 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 112 transitions. Word has length 58 [2021-11-19 04:54:16,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:16,935 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 112 transitions. [2021-11-19 04:54:16,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 39 states have (on average 2.076923076923077) internal successors, (81), 37 states have internal predecessors, (81), 7 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (8), 7 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-19 04:54:16,936 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 112 transitions. [2021-11-19 04:54:16,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-19 04:54:16,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:16,936 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:16,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 04:54:17,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-19 04:54:17,154 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_circular_appendErr13REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:17,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:17,155 INFO L85 PathProgramCache]: Analyzing trace with hash -2088699036, now seen corresponding path program 1 times [2021-11-19 04:54:17,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:17,155 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896453499] [2021-11-19 04:54:17,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:17,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:17,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:17,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:17,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:17,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:17,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:17,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:17,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:18,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:18,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:18,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:54:18,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:19,724 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:54:19,725 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:19,725 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896453499] [2021-11-19 04:54:19,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896453499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:54:19,725 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302363289] [2021-11-19 04:54:19,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:19,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:54:19,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:54:19,729 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:54:19,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 04:54:19,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:19,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-19 04:54:19,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:54:19,945 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 [2021-11-19 04:54:19,953 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 [2021-11-19 04:54:20,667 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-19 04:54:20,668 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 12 treesize of output 14 [2021-11-19 04:54:20,695 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-19 04:54:20,695 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 [2021-11-19 04:54:21,181 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 28 treesize of output 24 [2021-11-19 04:54:21,197 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 [2021-11-19 04:54:22,052 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:54:22,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 45 [2021-11-19 04:54:22,066 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:54:22,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 34 [2021-11-19 04:54:32,925 INFO L354 Elim1Store]: treesize reduction 352, result has 9.0 percent of original size [2021-11-19 04:54:32,925 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 5 case distinctions, treesize of input 149 treesize of output 144 [2021-11-19 04:54:33,022 INFO L354 Elim1Store]: treesize reduction 304, result has 9.3 percent of original size [2021-11-19 04:54:33,022 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 3 new quantified variables, introduced 5 case distinctions, treesize of input 138 treesize of output 104 [2021-11-19 04:54:33,058 INFO L354 Elim1Store]: treesize reduction 28, result has 42.9 percent of original size [2021-11-19 04:54:33,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 129 [2021-11-19 04:54:33,081 INFO L354 Elim1Store]: treesize reduction 84, result has 21.5 percent of original size [2021-11-19 04:54:33,081 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 3 case distinctions, treesize of input 120 treesize of output 125 [2021-11-19 04:54:33,831 INFO L354 Elim1Store]: treesize reduction 130, result has 2.3 percent of original size [2021-11-19 04:54:33,831 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 6 new quantified variables, introduced 10 case distinctions, treesize of input 153 treesize of output 91 [2021-11-19 04:54:33,870 INFO L354 Elim1Store]: treesize reduction 106, result has 2.8 percent of original size [2021-11-19 04:54:33,870 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 6 new quantified variables, introduced 10 case distinctions, treesize of input 76 treesize of output 56 [2021-11-19 04:54:34,168 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:54:34,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:54:37,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302363289] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:54:37,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:54:37,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 54 [2021-11-19 04:54:37,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809728016] [2021-11-19 04:54:37,646 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:54:37,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-19 04:54:37,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:37,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-19 04:54:37,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=3344, Unknown=4, NotChecked=0, Total=3540 [2021-11-19 04:54:37,648 INFO L87 Difference]: Start difference. First operand 106 states and 112 transitions. Second operand has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:54:53,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:53,659 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-11-19 04:54:53,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 04:54:53,660 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) Word has length 58 [2021-11-19 04:54:53,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:53,661 INFO L225 Difference]: With dead ends: 124 [2021-11-19 04:54:53,661 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 04:54:53,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1500 ImplicationChecksByTransitivity, 30.5s TimeCoverageRelationStatistics Valid=360, Invalid=5332, Unknown=8, NotChecked=0, Total=5700 [2021-11-19 04:54:53,664 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 227 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 2855 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 3396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 2855 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 482 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:53,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 307 Invalid, 3396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 2855 Invalid, 0 Unknown, 482 Unchecked, 2.4s Time] [2021-11-19 04:54:53,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 04:54:53,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 105. [2021-11-19 04:54:53,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 70 states have (on average 1.3714285714285714) internal successors, (96), 91 states have internal predecessors, (96), 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) [2021-11-19 04:54:53,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 111 transitions. [2021-11-19 04:54:53,670 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 111 transitions. Word has length 58 [2021-11-19 04:54:53,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:53,671 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 111 transitions. [2021-11-19 04:54:53,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 43 states have internal predecessors, (91), 9 states have call successors, (13), 7 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:54:53,672 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 111 transitions. [2021-11-19 04:54:53,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-19 04:54:53,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:53,673 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:53,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 04:54:53,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:54:53,889 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:53,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:53,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1306933252, now seen corresponding path program 1 times [2021-11-19 04:54:53,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:53,890 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224761150] [2021-11-19 04:54:53,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:53,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:53,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:53,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:53,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:53,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:53,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:53,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:53,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:53,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:53,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:54:54,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:54,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-19 04:54:54,061 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:54,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224761150] [2021-11-19 04:54:54,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224761150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:54:54,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:54:54,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-19 04:54:54,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631073467] [2021-11-19 04:54:54,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:54:54,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 04:54:54,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:54,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 04:54:54,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 04:54:54,064 INFO L87 Difference]: Start difference. First operand 105 states and 111 transitions. Second operand has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:54,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:54,596 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2021-11-19 04:54:54,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 04:54:54,596 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2021-11-19 04:54:54,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:54,597 INFO L225 Difference]: With dead ends: 124 [2021-11-19 04:54:54,597 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 04:54:54,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:54:54,598 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 209 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:54,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 83 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 04:54:54,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 04:54:54,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 104. [2021-11-19 04:54:54,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 70 states have (on average 1.3571428571428572) internal successors, (95), 90 states have internal predecessors, (95), 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) [2021-11-19 04:54:54,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 110 transitions. [2021-11-19 04:54:54,603 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 110 transitions. Word has length 60 [2021-11-19 04:54:54,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:54,603 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 110 transitions. [2021-11-19 04:54:54,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.714285714285714) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:54,604 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 110 transitions. [2021-11-19 04:54:54,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-19 04:54:54,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:54,605 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:54,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-19 04:54:54,605 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting mainErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:54,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:54,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1306933253, now seen corresponding path program 1 times [2021-11-19 04:54:54,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:54,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491700373] [2021-11-19 04:54:54,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:54,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:54,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:54,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:54,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:54,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:54,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:54:54,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:54,792 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-19 04:54:54,793 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:54,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491700373] [2021-11-19 04:54:54,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491700373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:54:54,793 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:54:54,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-19 04:54:54,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123533742] [2021-11-19 04:54:54,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:54:54,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 04:54:54,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:54,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 04:54:54,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-19 04:54:54,796 INFO L87 Difference]: Start difference. First operand 104 states and 110 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-19 04:54:55,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:55,347 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2021-11-19 04:54:55,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 04:54:55,348 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 60 [2021-11-19 04:54:55,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:55,349 INFO L225 Difference]: With dead ends: 120 [2021-11-19 04:54:55,349 INFO L226 Difference]: Without dead ends: 120 [2021-11-19 04:54:55,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:54:55,349 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 206 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:55,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 87 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 04:54:55,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-19 04:54:55,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 101. [2021-11-19 04:54:55,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 70 states have (on average 1.3142857142857143) internal successors, (92), 87 states have internal predecessors, (92), 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) [2021-11-19 04:54:55,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2021-11-19 04:54:55,354 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 60 [2021-11-19 04:54:55,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:55,355 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2021-11-19 04:54:55,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 6 states have internal predecessors, (33), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-19 04:54:55,355 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2021-11-19 04:54:55,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-19 04:54:55,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:55,356 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:55,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-19 04:54:55,357 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:55,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:55,357 INFO L85 PathProgramCache]: Analyzing trace with hash 1832406344, now seen corresponding path program 1 times [2021-11-19 04:54:55,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:55,358 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223966409] [2021-11-19 04:54:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:55,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:55,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:55,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:55,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:55,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:55,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:54:55,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:55,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:55,615 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:54:55,615 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:55,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223966409] [2021-11-19 04:54:55,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223966409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:54:55,616 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:54:55,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-19 04:54:55,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686865751] [2021-11-19 04:54:55,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:54:55,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 04:54:55,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:55,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 04:54:55,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:54:55,617 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:56,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:56,677 INFO L93 Difference]: Finished difference Result 144 states and 153 transitions. [2021-11-19 04:54:56,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-19 04:54:56,678 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 62 [2021-11-19 04:54:56,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:56,679 INFO L225 Difference]: With dead ends: 144 [2021-11-19 04:54:56,679 INFO L226 Difference]: Without dead ends: 144 [2021-11-19 04:54:56,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-19 04:54:56,680 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 223 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:56,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 96 Invalid, 870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 04:54:56,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-19 04:54:56,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 105. [2021-11-19 04:54:56,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 74 states have (on average 1.2972972972972974) internal successors, (96), 90 states have internal predecessors, (96), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:54:56,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2021-11-19 04:54:56,687 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 62 [2021-11-19 04:54:56,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:56,688 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2021-11-19 04:54:56,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:56,688 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2021-11-19 04:54:56,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-19 04:54:56,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:56,689 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:56,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-19 04:54:56,690 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:56,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:56,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1832406345, now seen corresponding path program 1 times [2021-11-19 04:54:56,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:56,691 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954190049] [2021-11-19 04:54:56,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:56,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:56,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:56,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:56,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:56,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:56,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:54:56,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:56,954 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:56,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:57,028 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 04:54:57,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:57,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954190049] [2021-11-19 04:54:57,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954190049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:54:57,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:54:57,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-19 04:54:57,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233027917] [2021-11-19 04:54:57,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:54:57,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 04:54:57,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:54:57,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 04:54:57,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-19 04:54:57,029 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:58,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:54:58,210 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2021-11-19 04:54:58,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-19 04:54:58,210 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 62 [2021-11-19 04:54:58,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:54:58,212 INFO L225 Difference]: With dead ends: 144 [2021-11-19 04:54:58,212 INFO L226 Difference]: Without dead ends: 144 [2021-11-19 04:54:58,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-11-19 04:54:58,213 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 220 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 920 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:54:58,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 101 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 920 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 04:54:58,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-19 04:54:58,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 107. [2021-11-19 04:54:58,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 76 states have (on average 1.2894736842105263) internal successors, (98), 92 states have internal predecessors, (98), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-19 04:54:58,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 114 transitions. [2021-11-19 04:54:58,219 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 114 transitions. Word has length 62 [2021-11-19 04:54:58,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:54:58,219 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 114 transitions. [2021-11-19 04:54:58,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.8181818181818183) internal successors, (42), 9 states have internal predecessors, (42), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:54:58,220 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 114 transitions. [2021-11-19 04:54:58,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 04:54:58,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:54:58,221 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:54:58,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-19 04:54:58,222 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting mainErr10ASSERT_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:54:58,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:54:58,222 INFO L85 PathProgramCache]: Analyzing trace with hash 5907140, now seen corresponding path program 1 times [2021-11-19 04:54:58,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:54:58,223 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310431515] [2021-11-19 04:54:58,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:58,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:54:58,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,308 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:54:58,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:54:58,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:58,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:54:58,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:54:58,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:58,820 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:54:58,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:59,112 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:54:59,113 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:54:59,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310431515] [2021-11-19 04:54:59,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310431515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:54:59,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251833101] [2021-11-19 04:54:59,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:54:59,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:54:59,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:54:59,118 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:54:59,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 04:54:59,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:54:59,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-19 04:54:59,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:54:59,748 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 21 treesize of output 13 [2021-11-19 04:55:02,027 WARN L860 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (let ((.cse0 (+ node_create_~temp~0.offset 8))) (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) .cse0 (select (select |c_#memory_$Pointer$.base| node_create_~temp~0.base) .cse0))))))) is different from true [2021-11-19 04:55:15,357 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_8 Int) (node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= (select (select (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) (+ node_create_~temp~0.offset 8) v_DerPreprocessor_8)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) |c_dll_circular_append_#t~mem10.base|))) is different from true [2021-11-19 04:55:17,392 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_8 Int) (node_create_~temp~0.offset Int) (node_create_~temp~0.base Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= (select (select (store |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base (store (store (store (select |c_old(#memory_$Pointer$.base)| node_create_~temp~0.base) node_create_~temp~0.offset 0) (+ node_create_~temp~0.offset 4) 0) (+ node_create_~temp~0.offset 8) v_DerPreprocessor_8)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) 0))) is different from true [2021-11-19 04:55:17,477 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2021-11-19 04:55:17,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:55:19,677 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_node_create_~temp~0.offset_60 Int) (v_DerPreprocessor_9 Int) (v_node_create_~temp~0.base_64 Int)) (or (not (= (select (select (store |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_64 (store (store (store (select |c_#memory_$Pointer$.base| v_node_create_~temp~0.base_64) v_node_create_~temp~0.offset_60 0) (+ v_node_create_~temp~0.offset_60 4) 0) (+ v_node_create_~temp~0.offset_60 8) v_DerPreprocessor_9)) |c_main_~#s~0.base|) |c_main_~#s~0.offset|) 0)) (<= |c_#StackHeapBarrier| v_node_create_~temp~0.base_64))) is different from false [2021-11-19 04:55:19,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251833101] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:55:19,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:55:19,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 33 [2021-11-19 04:55:19,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512998278] [2021-11-19 04:55:19,679 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:55:19,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-19 04:55:19,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:55:19,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-19 04:55:19,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=780, Unknown=9, NotChecked=236, Total=1122 [2021-11-19 04:55:19,681 INFO L87 Difference]: Start difference. First operand 107 states and 114 transitions. Second operand has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:55:57,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:55:57,459 INFO L93 Difference]: Finished difference Result 121 states and 127 transitions. [2021-11-19 04:55:57,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-19 04:55:57,460 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 64 [2021-11-19 04:55:57,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:55:57,461 INFO L225 Difference]: With dead ends: 121 [2021-11-19 04:55:57,461 INFO L226 Difference]: Without dead ends: 116 [2021-11-19 04:55:57,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 57.0s TimeCoverageRelationStatistics Valid=228, Invalid=2221, Unknown=17, NotChecked=396, Total=2862 [2021-11-19 04:55:57,463 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 206 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 1826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 476 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:55:57,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 208 Invalid, 1826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1295 Invalid, 0 Unknown, 476 Unchecked, 1.0s Time] [2021-11-19 04:55:57,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-19 04:55:57,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 97. [2021-11-19 04:55:57,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 67 states have (on average 1.2985074626865671) internal successors, (87), 83 states have internal predecessors, (87), 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) [2021-11-19 04:55:57,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 102 transitions. [2021-11-19 04:55:57,468 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 102 transitions. Word has length 64 [2021-11-19 04:55:57,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:55:57,468 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 102 transitions. [2021-11-19 04:55:57,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 7 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:55:57,469 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 102 transitions. [2021-11-19 04:55:57,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 04:55:57,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:55:57,470 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:55:57,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-19 04:55:57,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:55:57,670 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting dll_circular_appendErr22REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:55:57,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:55:57,671 INFO L85 PathProgramCache]: Analyzing trace with hash -336689492, now seen corresponding path program 1 times [2021-11-19 04:55:57,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:55:57,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196478274] [2021-11-19 04:55:57,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:55:57,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:55:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:55:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:55:58,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:55:58,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:55:58,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:55:58,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:55:58,210 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 04:55:58,210 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:55:58,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196478274] [2021-11-19 04:55:58,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196478274] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:55:58,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:55:58,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-19 04:55:58,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774014401] [2021-11-19 04:55:58,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:55:58,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-19 04:55:58,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:55:58,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-19 04:55:58,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-11-19 04:55:58,212 INFO L87 Difference]: Start difference. First operand 97 states and 102 transitions. Second operand has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-19 04:55:59,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:55:59,551 INFO L93 Difference]: Finished difference Result 115 states and 121 transitions. [2021-11-19 04:55:59,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-19 04:55:59,552 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 64 [2021-11-19 04:55:59,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:55:59,553 INFO L225 Difference]: With dead ends: 115 [2021-11-19 04:55:59,553 INFO L226 Difference]: Without dead ends: 115 [2021-11-19 04:55:59,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=738, Unknown=0, NotChecked=0, Total=870 [2021-11-19 04:55:59,554 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 195 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 1158 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 1158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 04:55:59,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 123 Invalid, 1220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 1158 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 04:55:59,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-19 04:55:59,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 96. [2021-11-19 04:55:59,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 67 states have (on average 1.2835820895522387) internal successors, (86), 82 states have internal predecessors, (86), 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) [2021-11-19 04:55:59,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2021-11-19 04:55:59,559 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 64 [2021-11-19 04:55:59,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:55:59,560 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2021-11-19 04:55:59,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.8125) internal successors, (45), 14 states have internal predecessors, (45), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-19 04:55:59,560 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2021-11-19 04:55:59,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 04:55:59,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:55:59,561 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:55:59,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-19 04:55:59,562 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_circular_appendErr23REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:55:59,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:55:59,562 INFO L85 PathProgramCache]: Analyzing trace with hash -336689491, now seen corresponding path program 1 times [2021-11-19 04:55:59,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:55:59,563 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507889012] [2021-11-19 04:55:59,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:55:59,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:55:59,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:00,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:56:00,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:00,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:56:00,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:00,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:56:00,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:00,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:56:00,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:00,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-19 04:56:00,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:01,674 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 04:56:01,674 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:56:01,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507889012] [2021-11-19 04:56:01,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507889012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:56:01,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272411556] [2021-11-19 04:56:01,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:56:01,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:56:01,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 04:56:01,678 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 04:56:01,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-19 04:56:01,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:56:01,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-19 04:56:01,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 04:56:01,848 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 [2021-11-19 04:56:01,909 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 [2021-11-19 04:56:02,157 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 [2021-11-19 04:56:02,544 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 [2021-11-19 04:56:02,772 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-19 04:56:02,772 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 15 treesize of output 15 [2021-11-19 04:56:03,284 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:56:03,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 23 [2021-11-19 04:56:03,290 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 11 treesize of output 7 [2021-11-19 04:56:12,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:12,042 INFO L354 Elim1Store]: treesize reduction 82, result has 17.2 percent of original size [2021-11-19 04:56:12,042 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 2 case distinctions, treesize of input 88 treesize of output 80 [2021-11-19 04:56:12,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:12,096 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-19 04:56:12,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 77 treesize of output 71 [2021-11-19 04:56:12,105 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-19 04:56:12,105 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 66 treesize of output 66 [2021-11-19 04:56:13,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:13,109 INFO L354 Elim1Store]: treesize reduction 70, result has 37.5 percent of original size [2021-11-19 04:56:13,110 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 3 new quantified variables, introduced 5 case distinctions, treesize of input 114 treesize of output 129 [2021-11-19 04:56:13,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:13,234 INFO L354 Elim1Store]: treesize reduction 226, result has 24.2 percent of original size [2021-11-19 04:56:13,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 2 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 16 case distinctions, treesize of input 128 treesize of output 161 [2021-11-19 04:56:13,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:14,003 INFO L354 Elim1Store]: treesize reduction 76, result has 47.9 percent of original size [2021-11-19 04:56:14,004 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 4 new quantified variables, introduced 7 case distinctions, treesize of input 178 treesize of output 220 [2021-11-19 04:56:14,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-19 04:56:14,143 INFO L354 Elim1Store]: treesize reduction 182, result has 31.8 percent of original size [2021-11-19 04:56:14,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 259 treesize of output 309 [2021-11-19 04:56:17,988 INFO L354 Elim1Store]: treesize reduction 294, result has 28.1 percent of original size [2021-11-19 04:56:17,989 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 8 new quantified variables, introduced 21 case distinctions, treesize of input 298 treesize of output 314 [2021-11-19 04:56:18,137 INFO L354 Elim1Store]: treesize reduction 212, result has 33.8 percent of original size [2021-11-19 04:56:18,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 373 treesize of output 389 [2021-11-19 04:56:24,210 INFO L354 Elim1Store]: treesize reduction 67, result has 21.2 percent of original size [2021-11-19 04:56:24,210 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 197 treesize of output 139 [2021-11-19 04:56:24,231 INFO L354 Elim1Store]: treesize reduction 27, result has 34.1 percent of original size [2021-11-19 04:56:24,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 130 treesize of output 99 [2021-11-19 04:56:24,374 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 04:56:24,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 04:58:35,494 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 04:58:35,495 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 201 treesize of output 205 [2021-11-19 04:59:18,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272411556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 04:59:18,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-19 04:59:18,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 33] total 57 [2021-11-19 04:59:18,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576206600] [2021-11-19 04:59:18,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-19 04:59:18,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-19 04:59:18,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:59:18,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-19 04:59:18,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=4288, Unknown=58, NotChecked=0, Total=4556 [2021-11-19 04:59:18,250 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand has 58 states, 51 states have (on average 2.019607843137255) internal successors, (103), 46 states have internal predecessors, (103), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:59:55,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:59:55,577 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2021-11-19 04:59:55,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-19 04:59:55,578 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 51 states have (on average 2.019607843137255) internal successors, (103), 46 states have internal predecessors, (103), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) Word has length 64 [2021-11-19 04:59:55,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:59:55,579 INFO L225 Difference]: With dead ends: 114 [2021-11-19 04:59:55,579 INFO L226 Difference]: Without dead ends: 114 [2021-11-19 04:59:55,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1893 ImplicationChecksByTransitivity, 218.0s TimeCoverageRelationStatistics Valid=453, Invalid=8409, Unknown=68, NotChecked=0, Total=8930 [2021-11-19 04:59:55,583 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 149 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 2627 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 3515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 2627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 844 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 04:59:55,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 299 Invalid, 3515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 2627 Invalid, 0 Unknown, 844 Unchecked, 2.4s Time] [2021-11-19 04:59:55,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-19 04:59:55,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 95. [2021-11-19 04:59:55,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 81 states have internal predecessors, (85), 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) [2021-11-19 04:59:55,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 100 transitions. [2021-11-19 04:59:55,588 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 100 transitions. Word has length 64 [2021-11-19 04:59:55,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:59:55,588 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 100 transitions. [2021-11-19 04:59:55,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 51 states have (on average 2.019607843137255) internal successors, (103), 46 states have internal predecessors, (103), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-19 04:59:55,589 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 100 transitions. [2021-11-19 04:59:55,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-19 04:59:55,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:59:55,590 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:59:55,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-19 04:59:55,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 04:59:55,805 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:59:55,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:59:55,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1028861698, now seen corresponding path program 1 times [2021-11-19 04:59:55,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:59:55,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928806454] [2021-11-19 04:59:55,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:55,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:59:55,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:55,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:59:55,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:55,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:59:55,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:55,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:59:55,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:55,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:59:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:55,946 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:59:55,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:56,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:59:56,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 04:59:56,210 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 04:59:56,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928806454] [2021-11-19 04:59:56,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928806454] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 04:59:56,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 04:59:56,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-19 04:59:56,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442704945] [2021-11-19 04:59:56,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 04:59:56,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 04:59:56,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-19 04:59:56,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 04:59:56,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-19 04:59:56,212 INFO L87 Difference]: Start difference. First operand 95 states and 100 transitions. Second operand has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:59:57,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 04:59:57,427 INFO L93 Difference]: Finished difference Result 119 states and 124 transitions. [2021-11-19 04:59:57,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 04:59:57,428 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 70 [2021-11-19 04:59:57,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 04:59:57,429 INFO L225 Difference]: With dead ends: 119 [2021-11-19 04:59:57,429 INFO L226 Difference]: Without dead ends: 119 [2021-11-19 04:59:57,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2021-11-19 04:59:57,431 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 167 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1088 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 1119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1088 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 04:59:57,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 110 Invalid, 1119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1088 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 04:59:57,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-19 04:59:57,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 96. [2021-11-19 04:59:57,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 68 states have (on average 1.2794117647058822) internal successors, (87), 82 states have internal predecessors, (87), 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) [2021-11-19 04:59:57,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2021-11-19 04:59:57,435 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 70 [2021-11-19 04:59:57,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 04:59:57,436 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2021-11-19 04:59:57,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 2 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-19 04:59:57,436 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2021-11-19 04:59:57,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-19 04:59:57,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 04:59:57,437 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 04:59:57,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-19 04:59:57,438 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 57 more)] === [2021-11-19 04:59:57,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 04:59:57,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1028861697, now seen corresponding path program 1 times [2021-11-19 04:59:57,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-19 04:59:57,438 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558503457] [2021-11-19 04:59:57,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 04:59:57,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 04:59:57,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:57,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-19 04:59:57,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:57,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-19 04:59:57,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:57,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:59:57,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:57,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-19 04:59:57,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:58,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-19 04:59:58,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 04:59:59,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-19 04:59:59,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 05:00:00,921 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 05:00:00,921 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-19 05:00:00,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558503457] [2021-11-19 05:00:00,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558503457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 05:00:00,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120745171] [2021-11-19 05:00:00,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 05:00:00,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 05:00:00,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 [2021-11-19 05:00:00,922 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 05:00:00,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1fb247d-7d71-4c5c-b77a-50b24553ed41/bin/uautomizer-ZXIjhQolGL/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-19 05:00:01,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 05:00:01,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-19 05:00:01,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 05:00:01,072 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 [2021-11-19 05:00:01,129 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 [2021-11-19 05:00:01,407 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 [2021-11-19 05:00:01,414 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 [2021-11-19 05:00:01,923 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 [2021-11-19 05:00:02,170 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-19 05:00:02,170 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 17 treesize of output 17 [2021-11-19 05:00:02,415 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-19 05:00:02,415 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 63 treesize of output 40 [2021-11-19 05:00:02,419 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 33 treesize of output 31 [2021-11-19 05:00:02,423 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 28 treesize of output 26 [2021-11-19 05:00:02,427 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 18 treesize of output 10