./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX --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 9aabbeff87ba819b44dc608a3105d0ba81b71cd88693ecf2e6bf3860a7863e64 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 09:19:54,346 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 09:19:54,349 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 09:19:54,393 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 09:19:54,394 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 09:19:54,396 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 09:19:54,398 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 09:19:54,401 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 09:19:54,404 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 09:19:54,406 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 09:19:54,407 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 09:19:54,409 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 09:19:54,410 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 09:19:54,412 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 09:19:54,414 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 09:19:54,416 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 09:19:54,418 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 09:19:54,420 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 09:19:54,423 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 09:19:54,426 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 09:19:54,428 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 09:19:54,430 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 09:19:54,432 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 09:19:54,434 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 09:19:54,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 09:19:54,445 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 09:19:54,445 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 09:19:54,447 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 09:19:54,452 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 09:19:54,454 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 09:19:54,454 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 09:19:54,456 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 09:19:54,457 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 09:19:54,460 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 09:19:54,462 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 09:19:54,464 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 09:19:54,466 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 09:19:54,467 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 09:19:54,467 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 09:19:54,469 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 09:19:54,470 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 09:19:54,471 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-09 09:19:54,529 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 09:19:54,534 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 09:19:54,535 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 09:19:54,535 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 09:19:54,537 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 09:19:54,538 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 09:19:54,538 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 09:19:54,539 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 09:19:54,539 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 09:19:54,539 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-09 09:19:54,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 09:19:54,541 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 09:19:54,541 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 09:19:54,542 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-09 09:19:54,542 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-09 09:19:54,542 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-09 09:19:54,543 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 09:19:54,543 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-09 09:19:54,543 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 09:19:54,544 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 09:19:54,544 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 09:19:54,544 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 09:19:54,545 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 09:19:54,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:19:54,545 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 09:19:54,546 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 09:19:54,546 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 09:19:54,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 09:19:54,547 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 09:19:54,549 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_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9aabbeff87ba819b44dc608a3105d0ba81b71cd88693ecf2e6bf3860a7863e64 [2021-11-09 09:19:54,985 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 09:19:55,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 09:19:55,019 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 09:19:55,021 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 09:19:55,023 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 09:19:55,024 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/list-simple/dll2c_append_unequal.i [2021-11-09 09:19:55,151 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/data/7c4d90269/2bbc61acb7af4dc1b4d8c6d81f35aa66/FLAG66bd21489 [2021-11-09 09:19:55,905 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 09:19:55,906 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/sv-benchmarks/c/list-simple/dll2c_append_unequal.i [2021-11-09 09:19:55,933 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/data/7c4d90269/2bbc61acb7af4dc1b4d8c6d81f35aa66/FLAG66bd21489 [2021-11-09 09:19:56,154 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/data/7c4d90269/2bbc61acb7af4dc1b4d8c6d81f35aa66 [2021-11-09 09:19:56,164 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 09:19:56,167 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-09 09:19:56,173 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 09:19:56,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 09:19:56,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 09:19:56,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:19:56" (1/1) ... [2021-11-09 09:19:56,196 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@167b1c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:56, skipping insertion in model container [2021-11-09 09:19:56,196 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:19:56" (1/1) ... [2021-11-09 09:19:56,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 09:19:56,266 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 09:19:56,949 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/sv-benchmarks/c/list-simple/dll2c_append_unequal.i[24672,24685] [2021-11-09 09:19:56,956 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:19:56,971 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 09:19:57,063 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/sv-benchmarks/c/list-simple/dll2c_append_unequal.i[24672,24685] [2021-11-09 09:19:57,066 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:19:57,113 INFO L208 MainTranslator]: Completed translation [2021-11-09 09:19:57,114 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57 WrapperNode [2021-11-09 09:19:57,114 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 09:19:57,117 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 09:19:57,117 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 09:19:57,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 09:19:57,133 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,178 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,178 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,219 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,234 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,263 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 09:19:57,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 09:19:57,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 09:19:57,277 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 09:19:57,278 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (1/1) ... [2021-11-09 09:19:57,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:19:57,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:19:57,319 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 09:19:57,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 09:19:57,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-09 09:19:57,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 09:19:57,387 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-09 09:19:57,388 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-09 09:19:57,388 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-09 09:19:57,390 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-09 09:19:57,390 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-09 09:19:57,390 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-11-09 09:19:57,390 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_destroy [2021-11-09 09:19:57,392 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_append [2021-11-09 09:19:57,392 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-09 09:19:57,392 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-09 09:19:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-09 09:19:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-09 09:19:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-09 09:19:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-09 09:19:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 09:19:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-09 09:19:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-09 09:19:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-09 09:19:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-09 09:19:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-09 09:19:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-09 09:19:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-09 09:19:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-09 09:19:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-09 09:19:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-09 09:19:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-09 09:19:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-09 09:19:57,397 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-09 09:19:57,397 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-09 09:19:57,397 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-09 09:19:57,397 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-09 09:19:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-09 09:19:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-09 09:19:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-09 09:19:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-09 09:19:57,399 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-09 09:19:57,399 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-09 09:19:57,399 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-09 09:19:57,399 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-09 09:19:57,399 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-09 09:19:57,400 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-09 09:19:57,400 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-09 09:19:57,400 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-09 09:19:57,400 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-09 09:19:57,401 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-09 09:19:57,401 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-09 09:19:57,402 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-09 09:19:57,403 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-09 09:19:57,403 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-09 09:19:57,403 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-09 09:19:57,404 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-09 09:19:57,404 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-09 09:19:57,405 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-09 09:19:57,405 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-09 09:19:57,405 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-09 09:19:57,405 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-09 09:19:57,406 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-09 09:19:57,406 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-09 09:19:57,406 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-09 09:19:57,406 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-09 09:19:57,406 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-09 09:19:57,407 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-09 09:19:57,407 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-09 09:19:57,408 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-09 09:19:57,409 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-09 09:19:57,409 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-09 09:19:57,410 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-09 09:19:57,411 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-09 09:19:57,411 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-09 09:19:57,412 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-09 09:19:57,412 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-09 09:19:57,412 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-09 09:19:57,412 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-09 09:19:57,413 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-09 09:19:57,413 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-09 09:19:57,413 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-09 09:19:57,413 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-09 09:19:57,414 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-09 09:19:57,415 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-09 09:19:57,415 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-09 09:19:57,415 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-09 09:19:57,415 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-09 09:19:57,416 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-09 09:19:57,416 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-09 09:19:57,416 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-09 09:19:57,416 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-09 09:19:57,416 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-09 09:19:57,417 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-09 09:19:57,417 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-09 09:19:57,417 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-09 09:19:57,417 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-09 09:19:57,417 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-09 09:19:57,418 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-09 09:19:57,418 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-09 09:19:57,418 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-09 09:19:57,418 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-09 09:19:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-09 09:19:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-09 09:19:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-09 09:19:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-09 09:19:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-09 09:19:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-09 09:19:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-09 09:19:57,421 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-09 09:19:57,421 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-09 09:19:57,421 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-09 09:19:57,422 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-09 09:19:57,422 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-09 09:19:57,423 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-09 09:19:57,423 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-09 09:19:57,423 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-09 09:19:57,423 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-09 09:19:57,424 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-09 09:19:57,424 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-09 09:19:57,424 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-09 09:19:57,424 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-09 09:19:57,424 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-09 09:19:57,425 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-09 09:19:57,425 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-09 09:19:57,425 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-09 09:19:57,425 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-09 09:19:57,426 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-09 09:19:57,426 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-09 09:19:57,426 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-09 09:19:57,427 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-11-09 09:19:57,428 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_destroy [2021-11-09 09:19:57,432 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-09 09:19:57,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 09:19:57,432 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_append [2021-11-09 09:19:57,433 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-09 09:19:57,435 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-09 09:19:57,436 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-09 09:19:57,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-09 09:19:57,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-09 09:19:57,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 09:19:58,041 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-09 09:19:58,606 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 09:19:58,619 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-09 09:19:58,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:19:58 BoogieIcfgContainer [2021-11-09 09:19:58,623 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 09:19:58,625 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 09:19:58,626 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 09:19:58,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 09:19:58,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 09:19:56" (1/3) ... [2021-11-09 09:19:58,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@612fc4f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:19:58, skipping insertion in model container [2021-11-09 09:19:58,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:19:57" (2/3) ... [2021-11-09 09:19:58,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@612fc4f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:19:58, skipping insertion in model container [2021-11-09 09:19:58,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:19:58" (3/3) ... [2021-11-09 09:19:58,644 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_append_unequal.i [2021-11-09 09:19:58,651 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 09:19:58,652 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2021-11-09 09:19:58,710 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 09:19:58,719 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 [2021-11-09 09:19:58,719 INFO L340 AbstractCegarLoop]: Starting to check reachability of 64 error locations. [2021-11-09 09:19:58,744 INFO L276 IsEmpty]: Start isEmpty. Operand has 155 states, 75 states have (on average 2.026666666666667) internal successors, (152), 139 states have internal predecessors, (152), 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) [2021-11-09 09:19:58,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:19:58,755 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:19:58,756 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:19:58,757 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:19:58,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:19:58,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1806807735, now seen corresponding path program 1 times [2021-11-09 09:19:58,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:19:58,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060394622] [2021-11-09 09:19:58,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:19:58,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:19:58,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:19:59,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:19:59,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:19:59,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:19:59,184 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:19:59,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060394622] [2021-11-09 09:19:59,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060394622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:19:59,186 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:19:59,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:19:59,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426379794] [2021-11-09 09:19:59,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:19:59,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:19:59,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:19:59,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:19:59,221 INFO L87 Difference]: Start difference. First operand has 155 states, 75 states have (on average 2.026666666666667) internal successors, (152), 139 states have internal predecessors, (152), 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) [2021-11-09 09:19:59,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:19:59,823 INFO L93 Difference]: Finished difference Result 171 states and 182 transitions. [2021-11-09 09:19:59,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:19:59,826 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 [2021-11-09 09:19:59,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:19:59,844 INFO L225 Difference]: With dead ends: 171 [2021-11-09 09:19:59,845 INFO L226 Difference]: Without dead ends: 165 [2021-11-09 09:19:59,848 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:19:59,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-09 09:19:59,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 146. [2021-11-09 09:19:59,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 72 states have (on average 1.9444444444444444) internal successors, (140), 132 states have internal predecessors, (140), 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) [2021-11-09 09:19:59,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 155 transitions. [2021-11-09 09:19:59,909 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 155 transitions. Word has length 12 [2021-11-09 09:19:59,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:19:59,910 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 155 transitions. [2021-11-09 09:19:59,911 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) [2021-11-09 09:19:59,911 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 155 transitions. [2021-11-09 09:19:59,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:19:59,912 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:19:59,912 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:19:59,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 09:19:59,913 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:19:59,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:19:59,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1806807734, now seen corresponding path program 1 times [2021-11-09 09:19:59,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:19:59,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756693944] [2021-11-09 09:19:59,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:19:59,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:19:59,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:00,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:00,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:00,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:20:00,112 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:00,112 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756693944] [2021-11-09 09:20:00,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756693944] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:00,113 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:00,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:20:00,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169269900] [2021-11-09 09:20:00,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:20:00,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:00,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:20:00,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:20:00,118 INFO L87 Difference]: Start difference. First operand 146 states and 155 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) [2021-11-09 09:20:00,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:00,563 INFO L93 Difference]: Finished difference Result 162 states and 172 transitions. [2021-11-09 09:20:00,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:20:00,564 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 [2021-11-09 09:20:00,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:00,567 INFO L225 Difference]: With dead ends: 162 [2021-11-09 09:20:00,567 INFO L226 Difference]: Without dead ends: 162 [2021-11-09 09:20:00,568 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:20:00,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-09 09:20:00,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 143. [2021-11-09 09:20:00,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 72 states have (on average 1.9027777777777777) internal successors, (137), 129 states have internal predecessors, (137), 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) [2021-11-09 09:20:00,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 152 transitions. [2021-11-09 09:20:00,603 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 152 transitions. Word has length 12 [2021-11-09 09:20:00,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:00,604 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 152 transitions. [2021-11-09 09:20:00,604 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) [2021-11-09 09:20:00,605 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 152 transitions. [2021-11-09 09:20:00,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:20:00,606 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:00,606 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:20:00,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 09:20:00,607 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:00,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:00,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1555459975, now seen corresponding path program 1 times [2021-11-09 09:20:00,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:00,609 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411910883] [2021-11-09 09:20:00,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:00,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:00,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:00,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:00,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:00,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:00,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:00,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:20:00,846 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:00,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411910883] [2021-11-09 09:20:00,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411910883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:00,847 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:00,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:20:00,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529862995] [2021-11-09 09:20:00,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:20:00,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:00,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:20:00,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:20:00,851 INFO L87 Difference]: Start difference. First operand 143 states and 152 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) [2021-11-09 09:20:01,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:01,456 INFO L93 Difference]: Finished difference Result 173 states and 185 transitions. [2021-11-09 09:20:01,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:20:01,456 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 [2021-11-09 09:20:01,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:01,459 INFO L225 Difference]: With dead ends: 173 [2021-11-09 09:20:01,459 INFO L226 Difference]: Without dead ends: 173 [2021-11-09 09:20:01,460 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:20:01,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-09 09:20:01,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 144. [2021-11-09 09:20:01,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 73 states have (on average 1.8904109589041096) internal successors, (138), 130 states have internal predecessors, (138), 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) [2021-11-09 09:20:01,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 153 transitions. [2021-11-09 09:20:01,476 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 153 transitions. Word has length 20 [2021-11-09 09:20:01,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:01,477 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 153 transitions. [2021-11-09 09:20:01,477 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) [2021-11-09 09:20:01,477 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 153 transitions. [2021-11-09 09:20:01,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:20:01,479 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:01,479 INFO L513 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] [2021-11-09 09:20:01,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-09 09:20:01,480 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:01,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:01,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1304508402, now seen corresponding path program 1 times [2021-11-09 09:20:01,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:01,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806182840] [2021-11-09 09:20:01,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:01,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:01,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:01,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:01,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:01,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:01,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:01,596 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:01,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:01,635 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:20:01,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:01,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806182840] [2021-11-09 09:20:01,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806182840] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:01,637 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:01,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:20:01,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742295429] [2021-11-09 09:20:01,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:20:01,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:01,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:20:01,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:20:01,640 INFO L87 Difference]: Start difference. First operand 144 states and 153 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) [2021-11-09 09:20:02,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:02,271 INFO L93 Difference]: Finished difference Result 163 states and 174 transitions. [2021-11-09 09:20:02,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:02,272 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 [2021-11-09 09:20:02,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:02,274 INFO L225 Difference]: With dead ends: 163 [2021-11-09 09:20:02,274 INFO L226 Difference]: Without dead ends: 163 [2021-11-09 09:20:02,275 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:02,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-09 09:20:02,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 143. [2021-11-09 09:20:02,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 73 states have (on average 1.8767123287671232) internal successors, (137), 129 states have internal predecessors, (137), 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) [2021-11-09 09:20:02,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 152 transitions. [2021-11-09 09:20:02,306 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 152 transitions. Word has length 30 [2021-11-09 09:20:02,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:02,307 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 152 transitions. [2021-11-09 09:20:02,307 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) [2021-11-09 09:20:02,307 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 152 transitions. [2021-11-09 09:20:02,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:20:02,309 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:02,309 INFO L513 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] [2021-11-09 09:20:02,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-09 09:20:02,310 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:02,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:02,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1304508403, now seen corresponding path program 1 times [2021-11-09 09:20:02,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:02,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033341286] [2021-11-09 09:20:02,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:02,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:02,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:02,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:02,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:02,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:02,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:02,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:02,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:02,627 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:02,628 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:02,628 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033341286] [2021-11-09 09:20:02,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033341286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:02,629 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:02,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:20:02,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215688388] [2021-11-09 09:20:02,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:20:02,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:02,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:20:02,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:20:02,631 INFO L87 Difference]: Start difference. First operand 143 states and 152 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) [2021-11-09 09:20:03,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:03,304 INFO L93 Difference]: Finished difference Result 162 states and 173 transitions. [2021-11-09 09:20:03,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:03,305 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 [2021-11-09 09:20:03,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:03,307 INFO L225 Difference]: With dead ends: 162 [2021-11-09 09:20:03,307 INFO L226 Difference]: Without dead ends: 162 [2021-11-09 09:20:03,308 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:03,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-09 09:20:03,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 142. [2021-11-09 09:20:03,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 128 states have internal predecessors, (136), 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) [2021-11-09 09:20:03,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 151 transitions. [2021-11-09 09:20:03,319 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 151 transitions. Word has length 30 [2021-11-09 09:20:03,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:03,320 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 151 transitions. [2021-11-09 09:20:03,320 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) [2021-11-09 09:20:03,320 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 151 transitions. [2021-11-09 09:20:03,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:20:03,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:03,322 INFO L513 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] [2021-11-09 09:20:03,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-09 09:20:03,323 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:03,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:03,323 INFO L85 PathProgramCache]: Analyzing trace with hash -497876237, now seen corresponding path program 1 times [2021-11-09 09:20:03,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:03,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284173652] [2021-11-09 09:20:03,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:03,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:03,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:03,448 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:03,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:03,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:03,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:03,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:03,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:03,604 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:03,605 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:03,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284173652] [2021-11-09 09:20:03,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284173652] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:03,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441871955] [2021-11-09 09:20:03,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:03,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:03,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:03,609 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:03,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 09:20:03,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:03,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-09 09:20:03,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:03,955 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 [2021-11-09 09:20:04,270 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 09:20:04,271 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 [2021-11-09 09:20:04,456 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:20:04,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441871955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:04,457 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:04,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-11-09 09:20:04,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126684184] [2021-11-09 09:20:04,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:20:04,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:04,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:20:04,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:20:04,460 INFO L87 Difference]: Start difference. First operand 142 states and 151 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) [2021-11-09 09:20:05,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:05,456 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2021-11-09 09:20:05,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:20:05,457 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 [2021-11-09 09:20:05,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:05,459 INFO L225 Difference]: With dead ends: 169 [2021-11-09 09:20:05,459 INFO L226 Difference]: Without dead ends: 169 [2021-11-09 09:20:05,460 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:20:05,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-09 09:20:05,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 147. [2021-11-09 09:20:05,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.844155844155844) internal successors, (142), 132 states have internal predecessors, (142), 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) [2021-11-09 09:20:05,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 159 transitions. [2021-11-09 09:20:05,470 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 159 transitions. Word has length 32 [2021-11-09 09:20:05,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:05,471 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 159 transitions. [2021-11-09 09:20:05,471 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) [2021-11-09 09:20:05,472 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 159 transitions. [2021-11-09 09:20:05,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:20:05,473 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:05,474 INFO L513 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] [2021-11-09 09:20:05,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:05,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-09 09:20:05,692 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:05,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:05,692 INFO L85 PathProgramCache]: Analyzing trace with hash -497876236, now seen corresponding path program 1 times [2021-11-09 09:20:05,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:05,693 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427653356] [2021-11-09 09:20:05,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:05,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:05,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:05,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:05,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:05,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:05,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:05,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:05,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:06,061 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:06,061 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:06,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427653356] [2021-11-09 09:20:06,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427653356] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:06,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723139358] [2021-11-09 09:20:06,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:06,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:06,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:06,064 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:06,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-09 09:20:06,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:06,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-09 09:20:06,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:06,311 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 [2021-11-09 09:20:06,317 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 [2021-11-09 09:20:06,760 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-09 09:20:06,761 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 [2021-11-09 09:20:06,772 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:20:06,772 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 21 treesize of output 21 [2021-11-09 09:20:06,907 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:20:06,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723139358] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:06,908 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:06,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-09 09:20:06,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773670683] [2021-11-09 09:20:06,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:20:06,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:06,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:20:06,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:20:06,911 INFO L87 Difference]: Start difference. First operand 147 states and 159 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) [2021-11-09 09:20:08,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:08,104 INFO L93 Difference]: Finished difference Result 168 states and 180 transitions. [2021-11-09 09:20:08,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:20:08,105 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 [2021-11-09 09:20:08,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:08,107 INFO L225 Difference]: With dead ends: 168 [2021-11-09 09:20:08,107 INFO L226 Difference]: Without dead ends: 168 [2021-11-09 09:20:08,108 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:20:08,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-09 09:20:08,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 147. [2021-11-09 09:20:08,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.8311688311688312) internal successors, (141), 132 states have internal predecessors, (141), 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) [2021-11-09 09:20:08,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 158 transitions. [2021-11-09 09:20:08,120 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 158 transitions. Word has length 32 [2021-11-09 09:20:08,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:08,120 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 158 transitions. [2021-11-09 09:20:08,121 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) [2021-11-09 09:20:08,121 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 158 transitions. [2021-11-09 09:20:08,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:20:08,122 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:08,122 INFO L513 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] [2021-11-09 09:20:08,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:08,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:08,340 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:08,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:08,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1717539607, now seen corresponding path program 1 times [2021-11-09 09:20:08,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:08,341 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952659274] [2021-11-09 09:20:08,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:08,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:08,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:08,407 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:08,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:08,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:08,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:08,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:08,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:08,483 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:08,483 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:08,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952659274] [2021-11-09 09:20:08,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952659274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:08,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388295387] [2021-11-09 09:20:08,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:08,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:08,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:08,486 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:08,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-09 09:20:08,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:08,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-09 09:20:08,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:08,882 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:08,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388295387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:08,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:08,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 8 [2021-11-09 09:20:08,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711400008] [2021-11-09 09:20:08,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:20:08,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:08,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:20:08,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:20:08,885 INFO L87 Difference]: Start difference. First operand 147 states and 158 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) [2021-11-09 09:20:09,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:09,407 INFO L93 Difference]: Finished difference Result 167 states and 178 transitions. [2021-11-09 09:20:09,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:09,408 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 [2021-11-09 09:20:09,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:09,410 INFO L225 Difference]: With dead ends: 167 [2021-11-09 09:20:09,410 INFO L226 Difference]: Without dead ends: 167 [2021-11-09 09:20:09,410 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:09,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-09 09:20:09,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 147. [2021-11-09 09:20:09,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 77 states have (on average 1.8181818181818181) internal successors, (140), 132 states have internal predecessors, (140), 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) [2021-11-09 09:20:09,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 157 transitions. [2021-11-09 09:20:09,419 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 157 transitions. Word has length 34 [2021-11-09 09:20:09,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:09,419 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 157 transitions. [2021-11-09 09:20:09,420 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) [2021-11-09 09:20:09,420 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 157 transitions. [2021-11-09 09:20:09,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-09 09:20:09,421 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:09,422 INFO L513 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] [2021-11-09 09:20:09,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:09,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:09,647 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:09,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:09,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1708900923, now seen corresponding path program 1 times [2021-11-09 09:20:09,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:09,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486877078] [2021-11-09 09:20:09,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:09,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:09,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:09,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:09,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:09,782 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:09,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:09,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:09,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:09,820 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:20:09,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:09,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486877078] [2021-11-09 09:20:09,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486877078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:09,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087489326] [2021-11-09 09:20:09,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:09,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:09,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:09,823 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:09,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-09 09:20:10,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:10,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 09:20:10,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:10,209 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:20:10,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087489326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:10,210 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:10,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3] total 6 [2021-11-09 09:20:10,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978243490] [2021-11-09 09:20:10,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:20:10,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:10,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:20:10,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:20:10,213 INFO L87 Difference]: Start difference. First operand 147 states and 157 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) [2021-11-09 09:20:10,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:10,760 INFO L93 Difference]: Finished difference Result 171 states and 184 transitions. [2021-11-09 09:20:10,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:10,764 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 [2021-11-09 09:20:10,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:10,766 INFO L225 Difference]: With dead ends: 171 [2021-11-09 09:20:10,766 INFO L226 Difference]: Without dead ends: 171 [2021-11-09 09:20:10,766 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:10,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-09 09:20:10,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 150. [2021-11-09 09:20:10,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 80 states have (on average 1.8125) internal successors, (145), 135 states have internal predecessors, (145), 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) [2021-11-09 09:20:10,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 162 transitions. [2021-11-09 09:20:10,781 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 162 transitions. Word has length 35 [2021-11-09 09:20:10,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:10,784 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 162 transitions. [2021-11-09 09:20:10,784 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) [2021-11-09 09:20:10,785 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 162 transitions. [2021-11-09 09:20:10,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-09 09:20:10,789 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:10,789 INFO L513 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] [2021-11-09 09:20:10,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:11,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-09 09:20:11,015 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:11,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:11,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1708900922, now seen corresponding path program 1 times [2021-11-09 09:20:11,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:11,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166297656] [2021-11-09 09:20:11,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:11,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:11,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:11,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:11,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:11,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:11,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:11,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:11,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:11,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:11,248 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:11,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166297656] [2021-11-09 09:20:11,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166297656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:11,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259919056] [2021-11-09 09:20:11,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:11,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:11,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:11,255 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:11,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-09 09:20:11,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:11,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-09 09:20:11,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:11,810 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:11,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259919056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:11,810 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:11,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 14 [2021-11-09 09:20:11,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813944663] [2021-11-09 09:20:11,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:20:11,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:11,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:20:11,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:20:11,813 INFO L87 Difference]: Start difference. First operand 150 states and 162 transitions. Second operand has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:20:12,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:12,572 INFO L93 Difference]: Finished difference Result 176 states and 189 transitions. [2021-11-09 09:20:12,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:20:12,573 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-11-09 09:20:12,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:12,575 INFO L225 Difference]: With dead ends: 176 [2021-11-09 09:20:12,576 INFO L226 Difference]: Without dead ends: 176 [2021-11-09 09:20:12,576 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:20:12,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-09 09:20:12,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 150. [2021-11-09 09:20:12,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 80 states have (on average 1.8) internal successors, (144), 135 states have internal predecessors, (144), 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) [2021-11-09 09:20:12,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 161 transitions. [2021-11-09 09:20:12,585 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 161 transitions. Word has length 35 [2021-11-09 09:20:12,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:12,586 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 161 transitions. [2021-11-09 09:20:12,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:20:12,586 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 161 transitions. [2021-11-09 09:20:12,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:20:12,587 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:12,587 INFO L513 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] [2021-11-09 09:20:12,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:12,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-09 09:20:12,815 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:12,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:12,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1436321051, now seen corresponding path program 1 times [2021-11-09 09:20:12,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:12,816 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621762430] [2021-11-09 09:20:12,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:12,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:12,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:12,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:12,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:12,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:12,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:12,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:12,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:12,996 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:20:12,996 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:12,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621762430] [2021-11-09 09:20:12,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621762430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:12,997 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:12,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-09 09:20:13,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456659240] [2021-11-09 09:20:13,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:20:13,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:13,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:20:13,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:20:13,002 INFO L87 Difference]: Start difference. First operand 150 states and 161 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) [2021-11-09 09:20:13,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:13,701 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2021-11-09 09:20:13,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:20:13,702 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 [2021-11-09 09:20:13,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:13,704 INFO L225 Difference]: With dead ends: 169 [2021-11-09 09:20:13,704 INFO L226 Difference]: Without dead ends: 169 [2021-11-09 09:20:13,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:20:13,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-09 09:20:13,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 149. [2021-11-09 09:20:13,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 80 states have (on average 1.7875) internal successors, (143), 134 states have internal predecessors, (143), 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) [2021-11-09 09:20:13,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2021-11-09 09:20:13,712 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 36 [2021-11-09 09:20:13,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:13,713 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2021-11-09 09:20:13,713 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) [2021-11-09 09:20:13,714 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2021-11-09 09:20:13,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:20:13,715 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:13,715 INFO L513 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] [2021-11-09 09:20:13,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-09 09:20:13,715 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:13,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:13,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1436321050, now seen corresponding path program 1 times [2021-11-09 09:20:13,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:13,716 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752477542] [2021-11-09 09:20:13,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:13,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:13,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:13,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:13,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:13,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:13,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:13,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:13,940 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:13,940 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:13,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752477542] [2021-11-09 09:20:13,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752477542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:13,941 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:13,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-09 09:20:13,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506722601] [2021-11-09 09:20:13,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:20:13,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:13,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:20:13,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:20:13,944 INFO L87 Difference]: Start difference. First operand 149 states and 160 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) [2021-11-09 09:20:14,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:14,607 INFO L93 Difference]: Finished difference Result 167 states and 179 transitions. [2021-11-09 09:20:14,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:20:14,608 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 [2021-11-09 09:20:14,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:14,610 INFO L225 Difference]: With dead ends: 167 [2021-11-09 09:20:14,610 INFO L226 Difference]: Without dead ends: 167 [2021-11-09 09:20:14,611 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:20:14,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-09 09:20:14,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 148. [2021-11-09 09:20:14,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 80 states have (on average 1.775) internal successors, (142), 133 states have internal predecessors, (142), 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) [2021-11-09 09:20:14,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 159 transitions. [2021-11-09 09:20:14,618 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 159 transitions. Word has length 36 [2021-11-09 09:20:14,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:14,619 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 159 transitions. [2021-11-09 09:20:14,619 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) [2021-11-09 09:20:14,619 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 159 transitions. [2021-11-09 09:20:14,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-09 09:20:14,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:14,621 INFO L513 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] [2021-11-09 09:20:14,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-09 09:20:14,621 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:14,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:14,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1757977551, now seen corresponding path program 1 times [2021-11-09 09:20:14,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:14,623 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877840948] [2021-11-09 09:20:14,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:14,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:14,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:14,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:14,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:20:14,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:14,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:20:14,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:14,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-11-09 09:20:14,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:14,759 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-09 09:20:14,759 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:14,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877840948] [2021-11-09 09:20:14,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877840948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:14,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401129668] [2021-11-09 09:20:14,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:14,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:14,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:14,763 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:14,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-09 09:20:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:15,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 09:20:15,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:15,288 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:20:15,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401129668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:15,289 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:20:15,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-09 09:20:15,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134730654] [2021-11-09 09:20:15,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 09:20:15,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:15,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 09:20:15,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:20:15,292 INFO L87 Difference]: Start difference. First operand 148 states and 159 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) [2021-11-09 09:20:15,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:15,335 INFO L93 Difference]: Finished difference Result 136 states and 143 transitions. [2021-11-09 09:20:15,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:20:15,335 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 [2021-11-09 09:20:15,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:15,342 INFO L225 Difference]: With dead ends: 136 [2021-11-09 09:20:15,342 INFO L226 Difference]: Without dead ends: 136 [2021-11-09 09:20:15,343 INFO L786 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 [2021-11-09 09:20:15,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-09 09:20:15,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-11-09 09:20:15,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 73 states have (on average 1.7534246575342465) internal successors, (128), 122 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) [2021-11-09 09:20:15,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 143 transitions. [2021-11-09 09:20:15,350 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 143 transitions. Word has length 47 [2021-11-09 09:20:15,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:15,352 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 143 transitions. [2021-11-09 09:20:15,352 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) [2021-11-09 09:20:15,353 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 143 transitions. [2021-11-09 09:20:15,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 09:20:15,355 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:15,355 INFO L513 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] [2021-11-09 09:20:15,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:15,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-09 09:20:15,571 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_appendErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:15,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:15,572 INFO L85 PathProgramCache]: Analyzing trace with hash 995122279, now seen corresponding path program 1 times [2021-11-09 09:20:15,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:15,572 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643533389] [2021-11-09 09:20:15,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:15,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:15,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:15,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:15,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:15,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:15,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:15,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:15,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:16,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:16,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:16,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:16,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:16,291 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:20:16,291 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:16,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643533389] [2021-11-09 09:20:16,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643533389] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:16,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941702120] [2021-11-09 09:20:16,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:16,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:16,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:16,295 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:16,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-09 09:20:16,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:16,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-09 09:20:16,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:16,656 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 [2021-11-09 09:20:16,674 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 [2021-11-09 09:20:17,314 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-11-09 09:20:17,315 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 [2021-11-09 09:20:17,540 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-09 09:20:17,541 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 [2021-11-09 09:20:17,669 INFO L354 Elim1Store]: treesize reduction 36, result has 23.4 percent of original size [2021-11-09 09:20:17,670 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 [2021-11-09 09:20:17,756 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:20:17,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941702120] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:17,757 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:17,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2021-11-09 09:20:17,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596561309] [2021-11-09 09:20:17,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-09 09:20:17,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:17,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-09 09:20:17,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2021-11-09 09:20:17,760 INFO L87 Difference]: Start difference. First operand 136 states and 143 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) [2021-11-09 09:20:19,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:19,630 INFO L93 Difference]: Finished difference Result 149 states and 157 transitions. [2021-11-09 09:20:19,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-09 09:20:19,630 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 [2021-11-09 09:20:19,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:19,632 INFO L225 Difference]: With dead ends: 149 [2021-11-09 09:20:19,632 INFO L226 Difference]: Without dead ends: 149 [2021-11-09 09:20:19,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=1058, Unknown=0, NotChecked=0, Total=1260 [2021-11-09 09:20:19,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-09 09:20:19,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 128. [2021-11-09 09:20:19,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 73 states have (on average 1.643835616438356) internal successors, (120), 114 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) [2021-11-09 09:20:19,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 135 transitions. [2021-11-09 09:20:19,640 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 135 transitions. Word has length 53 [2021-11-09 09:20:19,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:19,640 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 135 transitions. [2021-11-09 09:20:19,641 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) [2021-11-09 09:20:19,641 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 135 transitions. [2021-11-09 09:20:19,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 09:20:19,642 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:19,642 INFO L513 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] [2021-11-09 09:20:19,683 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-09 09:20:19,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-09 09:20:19,862 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_circular_appendErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:19,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:19,862 INFO L85 PathProgramCache]: Analyzing trace with hash 995122280, now seen corresponding path program 1 times [2021-11-09 09:20:19,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:19,862 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358835691] [2021-11-09 09:20:19,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:19,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:19,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:20,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:20,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:20,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:20,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:20,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,558 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:20:20,558 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:20,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358835691] [2021-11-09 09:20:20,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358835691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:20,559 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596576740] [2021-11-09 09:20:20,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:20,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:20,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:20,562 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:20,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-09 09:20:20,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:20,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-09 09:20:20,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:20,958 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 [2021-11-09 09:20:20,985 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 [2021-11-09 09:20:21,004 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 [2021-11-09 09:20:21,381 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:20:21,382 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 20 treesize of output 20 [2021-11-09 09:20:21,669 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-09 09:20:21,670 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 19 treesize of output 30 [2021-11-09 09:20:22,593 INFO L354 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2021-11-09 09:20:22,594 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 32 treesize of output 42 [2021-11-09 09:20:22,836 INFO L354 Elim1Store]: treesize reduction 66, result has 19.5 percent of original size [2021-11-09 09:20:22,839 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 6 case distinctions, treesize of input 38 treesize of output 46 [2021-11-09 09:20:23,216 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:23,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596576740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:23,217 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:23,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 28 [2021-11-09 09:20:23,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219328084] [2021-11-09 09:20:23,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-09 09:20:23,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:23,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-09 09:20:23,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:20:23,220 INFO L87 Difference]: Start difference. First operand 128 states and 135 transitions. Second operand has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:20:26,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:26,267 INFO L93 Difference]: Finished difference Result 149 states and 156 transitions. [2021-11-09 09:20:26,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 09:20:26,268 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 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 [2021-11-09 09:20:26,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:26,269 INFO L225 Difference]: With dead ends: 149 [2021-11-09 09:20:26,269 INFO L226 Difference]: Without dead ends: 149 [2021-11-09 09:20:26,271 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=283, Invalid=1787, Unknown=0, NotChecked=0, Total=2070 [2021-11-09 09:20:26,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-09 09:20:26,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 128. [2021-11-09 09:20:26,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 80 states have (on average 1.4875) internal successors, (119), 113 states have internal predecessors, (119), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:20:26,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 134 transitions. [2021-11-09 09:20:26,278 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 134 transitions. Word has length 53 [2021-11-09 09:20:26,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:26,279 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 134 transitions. [2021-11-09 09:20:26,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 25 states have (on average 2.96) internal successors, (74), 22 states have internal predecessors, (74), 9 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:20:26,279 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 134 transitions. [2021-11-09 09:20:26,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-09 09:20:26,280 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:26,281 INFO L513 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] [2021-11-09 09:20:26,319 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-09 09:20:26,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:26,495 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_circular_appendErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:26,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:26,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1465193335, now seen corresponding path program 1 times [2021-11-09 09:20:26,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:26,496 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949608729] [2021-11-09 09:20:26,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:26,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:26,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,597 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:26,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:26,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:26,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:26,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:26,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:26,724 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 09:20:26,724 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:26,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949608729] [2021-11-09 09:20:26,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949608729] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:26,726 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:26,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:20:26,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943077180] [2021-11-09 09:20:26,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:20:26,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:26,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:20:26,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:20:26,732 INFO L87 Difference]: Start difference. First operand 128 states and 134 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) [2021-11-09 09:20:27,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:27,301 INFO L93 Difference]: Finished difference Result 143 states and 150 transitions. [2021-11-09 09:20:27,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:27,302 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 [2021-11-09 09:20:27,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:27,304 INFO L225 Difference]: With dead ends: 143 [2021-11-09 09:20:27,304 INFO L226 Difference]: Without dead ends: 143 [2021-11-09 09:20:27,304 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:27,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-09 09:20:27,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 124. [2021-11-09 09:20:27,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 80 states have (on average 1.4375) internal successors, (115), 109 states have internal predecessors, (115), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:20:27,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 130 transitions. [2021-11-09 09:20:27,314 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 130 transitions. Word has length 55 [2021-11-09 09:20:27,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:27,314 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 130 transitions. [2021-11-09 09:20:27,315 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) [2021-11-09 09:20:27,315 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 130 transitions. [2021-11-09 09:20:27,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-09 09:20:27,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:27,316 INFO L513 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] [2021-11-09 09:20:27,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-09 09:20:27,317 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_circular_appendErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:27,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:27,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1465193336, now seen corresponding path program 1 times [2021-11-09 09:20:27,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:27,318 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644047949] [2021-11-09 09:20:27,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:27,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:27,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:27,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:27,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:27,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:27,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,436 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:27,470 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:20:27,470 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:27,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644047949] [2021-11-09 09:20:27,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644047949] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:20:27,471 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:20:27,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:20:27,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358438559] [2021-11-09 09:20:27,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:20:27,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:27,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:20:27,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:20:27,474 INFO L87 Difference]: Start difference. First operand 124 states and 130 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) [2021-11-09 09:20:27,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:27,976 INFO L93 Difference]: Finished difference Result 139 states and 146 transitions. [2021-11-09 09:20:27,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:20:27,976 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 [2021-11-09 09:20:27,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:27,978 INFO L225 Difference]: With dead ends: 139 [2021-11-09 09:20:27,978 INFO L226 Difference]: Without dead ends: 139 [2021-11-09 09:20:27,979 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:20:27,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-09 09:20:27,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 120. [2021-11-09 09:20:27,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 80 states have (on average 1.3875) internal successors, (111), 105 states have internal predecessors, (111), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:20:27,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 126 transitions. [2021-11-09 09:20:27,984 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 126 transitions. Word has length 55 [2021-11-09 09:20:27,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:27,985 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 126 transitions. [2021-11-09 09:20:27,985 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) [2021-11-09 09:20:27,985 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 126 transitions. [2021-11-09 09:20:27,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-09 09:20:27,986 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:27,986 INFO L513 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] [2021-11-09 09:20:27,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-09 09:20:27,986 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_circular_appendErr10REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:27,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:27,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1823657878, now seen corresponding path program 1 times [2021-11-09 09:20:27,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:27,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939928185] [2021-11-09 09:20:27,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:27,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:28,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:28,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:28,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:28,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:28,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:28,687 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-09 09:20:28,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:28,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939928185] [2021-11-09 09:20:28,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939928185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:28,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1692540663] [2021-11-09 09:20:28,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:28,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:28,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:28,689 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:28,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-09 09:20:29,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:29,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-09 09:20:29,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:29,164 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 [2021-11-09 09:20:29,488 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 [2021-11-09 09:20:33,997 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-09 09:20:33,997 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 53 treesize of output 45 [2021-11-09 09:20:34,023 INFO L354 Elim1Store]: treesize reduction 30, result has 37.5 percent of original size [2021-11-09 09:20:34,023 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 42 treesize of output 50 [2021-11-09 09:20:34,319 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-09 09:20:34,320 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 51 treesize of output 29 [2021-11-09 09:20:34,412 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:20:34,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1692540663] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:34,413 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:20:34,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 31 [2021-11-09 09:20:34,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687121649] [2021-11-09 09:20:34,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-09 09:20:34,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:20:34,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-09 09:20:34,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=896, Unknown=2, NotChecked=0, Total=992 [2021-11-09 09:20:34,415 INFO L87 Difference]: Start difference. First operand 120 states and 126 transitions. Second operand has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 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) [2021-11-09 09:20:51,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:20:51,091 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2021-11-09 09:20:51,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-09 09:20:51,092 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 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 [2021-11-09 09:20:51,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:20:51,093 INFO L225 Difference]: With dead ends: 138 [2021-11-09 09:20:51,094 INFO L226 Difference]: Without dead ends: 138 [2021-11-09 09:20:51,095 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=185, Invalid=1619, Unknown=2, NotChecked=0, Total=1806 [2021-11-09 09:20:51,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-09 09:20:51,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2021-11-09 09:20:51,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 80 states have (on average 1.375) internal successors, (110), 104 states have internal predecessors, (110), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:20:51,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 125 transitions. [2021-11-09 09:20:51,101 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 125 transitions. Word has length 56 [2021-11-09 09:20:51,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:20:51,102 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 125 transitions. [2021-11-09 09:20:51,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 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) [2021-11-09 09:20:51,102 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 125 transitions. [2021-11-09 09:20:51,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-09 09:20:51,103 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:20:51,103 INFO L513 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] [2021-11-09 09:20:51,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-09 09:20:51,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-09 09:20:51,304 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_circular_appendErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:20:51,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:20:51,305 INFO L85 PathProgramCache]: Analyzing trace with hash 1823657879, now seen corresponding path program 1 times [2021-11-09 09:20:51,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:20:51,305 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83685255] [2021-11-09 09:20:51,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:51,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:20:51,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:51,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:20:51,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:51,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:20:51,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:51,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:20:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:51,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:20:51,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:52,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:20:52,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:53,008 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:20:53,008 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:20:53,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83685255] [2021-11-09 09:20:53,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83685255] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:20:53,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735612582] [2021-11-09 09:20:53,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:20:53,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:20:53,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:20:53,013 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:20:53,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-09 09:20:53,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:20:53,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-09 09:20:53,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:20:53,555 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 [2021-11-09 09:20:53,562 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 [2021-11-09 09:20:54,516 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 [2021-11-09 09:20:54,524 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 [2021-11-09 09:20:59,321 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-09 09:20:59,322 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 [2021-11-09 09:20:59,391 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-09 09:20:59,391 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 [2021-11-09 09:20:59,410 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-09 09:20:59,411 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 [2021-11-09 09:20:59,423 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-09 09:20:59,424 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 [2021-11-09 09:20:59,924 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-09 09:20:59,925 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 [2021-11-09 09:20:59,935 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-09 09:20:59,935 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 [2021-11-09 09:21:00,030 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:21:00,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735612582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:21:00,031 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:21:00,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 39 [2021-11-09 09:21:00,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278115016] [2021-11-09 09:21:00,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-09 09:21:00,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:21:00,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-09 09:21:00,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1449, Unknown=2, NotChecked=0, Total=1560 [2021-11-09 09:21:00,036 INFO L87 Difference]: Start difference. First operand 119 states and 125 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) [2021-11-09 09:21:24,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:21:24,222 INFO L93 Difference]: Finished difference Result 137 states and 144 transitions. [2021-11-09 09:21:24,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-09 09:21:24,222 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 [2021-11-09 09:21:24,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:21:24,224 INFO L225 Difference]: With dead ends: 137 [2021-11-09 09:21:24,224 INFO L226 Difference]: Without dead ends: 137 [2021-11-09 09:21:24,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=227, Invalid=2629, Unknown=6, NotChecked=0, Total=2862 [2021-11-09 09:21:24,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-09 09:21:24,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 118. [2021-11-09 09:21:24,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 80 states have (on average 1.3625) internal successors, (109), 103 states have internal predecessors, (109), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:21:24,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 124 transitions. [2021-11-09 09:21:24,231 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 124 transitions. Word has length 56 [2021-11-09 09:21:24,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:21:24,232 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 124 transitions. [2021-11-09 09:21:24,232 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) [2021-11-09 09:21:24,232 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 124 transitions. [2021-11-09 09:21:24,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 09:21:24,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:21:24,233 INFO L513 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] [2021-11-09 09:21:24,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-09 09:21:24,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:21:24,449 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_circular_appendErr12REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:21:24,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:21:24,450 INFO L85 PathProgramCache]: Analyzing trace with hash 188568119, now seen corresponding path program 1 times [2021-11-09 09:21:24,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:21:24,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572012533] [2021-11-09 09:21:24,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:21:24,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:21:24,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:24,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:21:24,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:24,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:21:24,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:25,095 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:21:25,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:25,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:21:25,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:25,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:21:25,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:26,468 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:21:26,468 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:21:26,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572012533] [2021-11-09 09:21:26,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572012533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:21:26,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146498650] [2021-11-09 09:21:26,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:21:26,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:21:26,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:21:26,470 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:21:26,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-09 09:21:26,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:21:26,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-09 09:21:26,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:21:27,016 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 [2021-11-09 09:21:27,360 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 [2021-11-09 09:21:27,777 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-09 09:21:27,777 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 [2021-11-09 09:21:27,781 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 [2021-11-09 09:21:27,787 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-09 09:21:27,787 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 [2021-11-09 09:21:32,545 INFO L354 Elim1Store]: treesize reduction 394, result has 8.6 percent of original size [2021-11-09 09:21:32,546 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 [2021-11-09 09:21:32,614 INFO L354 Elim1Store]: treesize reduction 193, result has 11.1 percent of original size [2021-11-09 09:21:32,614 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 [2021-11-09 09:21:32,661 INFO L354 Elim1Store]: treesize reduction 116, result has 32.2 percent of original size [2021-11-09 09:21:32,661 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 [2021-11-09 09:21:33,160 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-09 09:21:33,161 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 [2021-11-09 09:21:33,439 INFO L354 Elim1Store]: treesize reduction 67, result has 17.3 percent of original size [2021-11-09 09:21:33,440 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 [2021-11-09 09:21:33,735 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:21:33,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146498650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:21:33,735 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:21:33,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 45 [2021-11-09 09:21:33,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138439360] [2021-11-09 09:21:33,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-09 09:21:33,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:21:33,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-09 09:21:33,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1946, Unknown=2, NotChecked=0, Total=2070 [2021-11-09 09:21:33,738 INFO L87 Difference]: Start difference. First operand 118 states and 124 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) [2021-11-09 09:22:03,774 WARN L207 SmtUtils]: Spent 6.23 s on a formula simplification. DAG size of input: 124 DAG size of output: 108 [2021-11-09 09:22:20,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:22:20,817 INFO L93 Difference]: Finished difference Result 138 states and 145 transitions. [2021-11-09 09:22:20,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 09:22:20,818 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 [2021-11-09 09:22:20,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:22:20,819 INFO L225 Difference]: With dead ends: 138 [2021-11-09 09:22:20,819 INFO L226 Difference]: Without dead ends: 138 [2021-11-09 09:22:20,822 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 885 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=319, Invalid=4097, Unknown=6, NotChecked=0, Total=4422 [2021-11-09 09:22:20,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-09 09:22:20,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 117. [2021-11-09 09:22:20,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 80 states have (on average 1.35) internal successors, (108), 102 states have internal predecessors, (108), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:22:20,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2021-11-09 09:22:20,828 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 58 [2021-11-09 09:22:20,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:22:20,828 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2021-11-09 09:22:20,829 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) [2021-11-09 09:22:20,829 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2021-11-09 09:22:20,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 09:22:20,830 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:22:20,830 INFO L513 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] [2021-11-09 09:22:20,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-09 09:22:21,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:22:21,051 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_circular_appendErr13REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:22:21,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:22:21,052 INFO L85 PathProgramCache]: Analyzing trace with hash 188568120, now seen corresponding path program 1 times [2021-11-09 09:22:21,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:22:21,052 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367542135] [2021-11-09 09:22:21,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:22:21,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:22:21,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:21,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:22:21,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:21,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:22:21,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:21,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:22:21,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:21,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:22:21,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:22,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:22:22,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:23,936 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:22:23,936 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:22:23,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367542135] [2021-11-09 09:22:23,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367542135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:22:23,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467693147] [2021-11-09 09:22:23,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:22:23,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:22:23,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:22:23,938 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:22:23,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-09 09:22:24,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:22:24,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-09 09:22:24,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:22:24,596 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 [2021-11-09 09:22:24,603 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 [2021-11-09 09:22:25,313 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 09:22:25,314 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 [2021-11-09 09:22:25,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-09 09:22:25,865 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 [2021-11-09 09:22:25,878 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 [2021-11-09 09:22:26,671 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-09 09:22:26,675 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 99 treesize of output 44 [2021-11-09 09:22:26,696 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-09 09:22:26,696 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 41 treesize of output 45 [2021-11-09 09:22:26,707 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-09 09:22:26,707 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 39 treesize of output 35 [2021-11-09 09:22:26,716 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-09 09:22:26,717 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 29 treesize of output 25 [2021-11-09 09:22:39,670 INFO L354 Elim1Store]: treesize reduction 394, result has 8.6 percent of original size [2021-11-09 09:22:39,671 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 166 treesize of output 120 [2021-11-09 09:22:39,768 INFO L354 Elim1Store]: treesize reduction 368, result has 8.7 percent of original size [2021-11-09 09:22:39,769 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 155 treesize of output 141 [2021-11-09 09:22:39,801 INFO L354 Elim1Store]: treesize reduction 34, result has 44.3 percent of original size [2021-11-09 09:22:39,801 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 144 treesize of output 146 [2021-11-09 09:22:39,826 INFO L354 Elim1Store]: treesize reduction 108, result has 21.2 percent of original size [2021-11-09 09:22:39,826 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 137 treesize of output 142 [2021-11-09 09:22:40,644 INFO L354 Elim1Store]: treesize reduction 92, result has 1.1 percent of original size [2021-11-09 09:22:40,644 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 170 treesize of output 87 [2021-11-09 09:22:40,672 INFO L354 Elim1Store]: treesize reduction 66, result has 12.0 percent of original size [2021-11-09 09:22:40,672 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 75 treesize of output 59 [2021-11-09 09:22:40,967 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:22:40,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467693147] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:22:40,968 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:22:40,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 54 [2021-11-09 09:22:40,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104946732] [2021-11-09 09:22:40,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-09 09:22:40,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:22:40,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-09 09:22:40,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2809, Unknown=6, NotChecked=0, Total=2970 [2021-11-09 09:22:40,972 INFO L87 Difference]: Start difference. First operand 117 states and 123 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) [2021-11-09 09:23:16,137 WARN L207 SmtUtils]: Spent 6.44 s on a formula simplification. DAG size of input: 154 DAG size of output: 127 [2021-11-09 09:23:25,083 WARN L207 SmtUtils]: Spent 6.39 s on a formula simplification. DAG size of input: 170 DAG size of output: 132 [2021-11-09 09:23:33,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:23:33,273 INFO L93 Difference]: Finished difference Result 137 states and 144 transitions. [2021-11-09 09:23:33,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 09:23:33,274 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 [2021-11-09 09:23:33,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:23:33,275 INFO L225 Difference]: With dead ends: 137 [2021-11-09 09:23:33,275 INFO L226 Difference]: Without dead ends: 137 [2021-11-09 09:23:33,278 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1356 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=394, Invalid=5602, Unknown=10, NotChecked=0, Total=6006 [2021-11-09 09:23:33,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-09 09:23:33,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 116. [2021-11-09 09:23:33,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 80 states have (on average 1.3375) internal successors, (107), 101 states have internal predecessors, (107), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:23:33,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 122 transitions. [2021-11-09 09:23:33,283 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 122 transitions. Word has length 58 [2021-11-09 09:23:33,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:23:33,283 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 122 transitions. [2021-11-09 09:23:33,284 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) [2021-11-09 09:23:33,284 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 122 transitions. [2021-11-09 09:23:33,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-09 09:23:33,284 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:23:33,285 INFO L513 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] [2021-11-09 09:23:33,317 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-09 09:23:33,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-09 09:23:33,507 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:23:33,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:23:33,508 INFO L85 PathProgramCache]: Analyzing trace with hash 2122979889, now seen corresponding path program 1 times [2021-11-09 09:23:33,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:23:33,508 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558776498] [2021-11-09 09:23:33,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:33,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:23:33,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,576 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:23:33,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:23:33,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:33,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:23:33,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-09 09:23:33,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:33,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:33,763 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:23:33,763 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:23:33,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558776498] [2021-11-09 09:23:33,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558776498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:23:33,763 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:23:33,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-09 09:23:33,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777143740] [2021-11-09 09:23:33,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:23:33,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:23:33,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:23:33,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:23:33,765 INFO L87 Difference]: Start difference. First operand 116 states and 122 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) [2021-11-09 09:23:34,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:23:34,513 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2021-11-09 09:23:34,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 09:23:34,513 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 [2021-11-09 09:23:34,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:23:34,515 INFO L225 Difference]: With dead ends: 163 [2021-11-09 09:23:34,515 INFO L226 Difference]: Without dead ends: 163 [2021-11-09 09:23:34,516 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:23:34,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-09 09:23:34,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 120. [2021-11-09 09:23:34,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 84 states have (on average 1.3214285714285714) internal successors, (111), 104 states have internal predecessors, (111), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-09 09:23:34,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2021-11-09 09:23:34,521 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 62 [2021-11-09 09:23:34,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:23:34,522 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2021-11-09 09:23:34,522 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) [2021-11-09 09:23:34,522 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2021-11-09 09:23:34,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-09 09:23:34,523 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:23:34,523 INFO L513 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] [2021-11-09 09:23:34,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-09 09:23:34,524 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:23:34,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:23:34,524 INFO L85 PathProgramCache]: Analyzing trace with hash 2122979890, now seen corresponding path program 1 times [2021-11-09 09:23:34,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:23:34,525 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101274015] [2021-11-09 09:23:34,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:34,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:23:34,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:23:34,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:23:34,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:34,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:23:34,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-09 09:23:34,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:34,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:34,859 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 09:23:34,860 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:23:34,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101274015] [2021-11-09 09:23:34,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101274015] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:23:34,860 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:23:34,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-09 09:23:34,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915502822] [2021-11-09 09:23:34,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:23:34,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:23:34,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:23:34,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:23:34,862 INFO L87 Difference]: Start difference. First operand 120 states and 127 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) [2021-11-09 09:23:35,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:23:35,794 INFO L93 Difference]: Finished difference Result 166 states and 178 transitions. [2021-11-09 09:23:35,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-09 09:23:35,795 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 [2021-11-09 09:23:35,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:23:35,796 INFO L225 Difference]: With dead ends: 166 [2021-11-09 09:23:35,796 INFO L226 Difference]: Without dead ends: 166 [2021-11-09 09:23:35,796 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:23:35,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-09 09:23:35,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 122. [2021-11-09 09:23:35,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 86 states have (on average 1.313953488372093) internal successors, (113), 106 states have internal predecessors, (113), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-09 09:23:35,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 129 transitions. [2021-11-09 09:23:35,801 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 129 transitions. Word has length 62 [2021-11-09 09:23:35,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:23:35,801 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 129 transitions. [2021-11-09 09:23:35,802 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) [2021-11-09 09:23:35,802 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 129 transitions. [2021-11-09 09:23:35,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-09 09:23:35,802 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:23:35,802 INFO L513 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] [2021-11-09 09:23:35,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-09 09:23:35,803 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_circular_appendErr22REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:23:35,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:23:35,804 INFO L85 PathProgramCache]: Analyzing trace with hash -257889632, now seen corresponding path program 1 times [2021-11-09 09:23:35,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:23:35,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087118956] [2021-11-09 09:23:35,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:35,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:23:35,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:23:36,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:23:36,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,144 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:36,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:23:36,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:23:36,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:36,240 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 09:23:36,240 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:23:36,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087118956] [2021-11-09 09:23:36,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087118956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:23:36,240 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:23:36,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-09 09:23:36,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753132996] [2021-11-09 09:23:36,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:23:36,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:23:36,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:23:36,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:23:36,242 INFO L87 Difference]: Start difference. First operand 122 states and 129 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) [2021-11-09 09:23:37,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:23:37,048 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2021-11-09 09:23:37,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-09 09:23:37,049 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 [2021-11-09 09:23:37,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:23:37,051 INFO L225 Difference]: With dead ends: 140 [2021-11-09 09:23:37,051 INFO L226 Difference]: Without dead ends: 140 [2021-11-09 09:23:37,052 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2021-11-09 09:23:37,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-09 09:23:37,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 121. [2021-11-09 09:23:37,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 86 states have (on average 1.302325581395349) internal successors, (112), 105 states have internal predecessors, (112), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-09 09:23:37,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 128 transitions. [2021-11-09 09:23:37,057 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 128 transitions. Word has length 64 [2021-11-09 09:23:37,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:23:37,058 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 128 transitions. [2021-11-09 09:23:37,058 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) [2021-11-09 09:23:37,058 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 128 transitions. [2021-11-09 09:23:37,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-09 09:23:37,059 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:23:37,059 INFO L513 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] [2021-11-09 09:23:37,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-09 09:23:37,060 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_circular_appendErr23REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:23:37,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:23:37,060 INFO L85 PathProgramCache]: Analyzing trace with hash -257889631, now seen corresponding path program 1 times [2021-11-09 09:23:37,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:23:37,061 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149788275] [2021-11-09 09:23:37,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:37,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:23:37,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:37,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:23:37,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:37,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:23:37,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:37,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:37,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:37,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:23:37,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:37,873 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-11-09 09:23:37,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:38,163 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:23:38,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:23:38,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149788275] [2021-11-09 09:23:38,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149788275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:23:38,164 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:23:38,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-11-09 09:23:38,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16374305] [2021-11-09 09:23:38,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-09 09:23:38,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:23:38,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-09 09:23:38,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2021-11-09 09:23:38,165 INFO L87 Difference]: Start difference. First operand 121 states and 128 transitions. Second operand has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:23:39,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:23:39,541 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2021-11-09 09:23:39,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-09 09:23:39,541 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 64 [2021-11-09 09:23:39,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:23:39,543 INFO L225 Difference]: With dead ends: 161 [2021-11-09 09:23:39,543 INFO L226 Difference]: Without dead ends: 161 [2021-11-09 09:23:39,544 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-11-09 09:23:39,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-09 09:23:39,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 120. [2021-11-09 09:23:39,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 86 states have (on average 1.2906976744186047) internal successors, (111), 104 states have internal predecessors, (111), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-09 09:23:39,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2021-11-09 09:23:39,548 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 64 [2021-11-09 09:23:39,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:23:39,549 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2021-11-09 09:23:39,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:23:39,549 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2021-11-09 09:23:39,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-09 09:23:39,550 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:23:39,550 INFO L513 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] [2021-11-09 09:23:39,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-09 09:23:39,551 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr14ASSERT_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:23:39,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:23:39,551 INFO L85 PathProgramCache]: Analyzing trace with hash 74209656, now seen corresponding path program 1 times [2021-11-09 09:23:39,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:23:39,551 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579102175] [2021-11-09 09:23:39,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:39,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:23:39,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:39,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:23:39,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:39,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:23:39,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:39,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:39,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:39,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:23:39,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:39,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-09 09:23:39,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:40,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:23:40,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:40,349 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:23:40,349 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:23:40,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579102175] [2021-11-09 09:23:40,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579102175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:23:40,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996493479] [2021-11-09 09:23:40,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:23:40,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:23:40,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:23:40,351 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:23:40,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-09 09:23:40,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:23:40,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-09 09:23:40,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:23:41,299 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 [2021-11-09 09:23:43,563 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 [2021-11-09 09:23:54,908 WARN L860 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.offset Int) (node_create_~temp~0.base Int) (v_DerPreprocessor_1 Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= (select (select (store |c_old(#memory_$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_1)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) |c_dll_circular_append_#t~mem12.base|))) is different from true [2021-11-09 09:23:56,933 WARN L860 $PredicateComparison]: unable to prove that (exists ((node_create_~temp~0.offset Int) (node_create_~temp~0.base Int) (v_DerPreprocessor_1 Int)) (and (<= (+ node_create_~temp~0.base 1) |c_#StackHeapBarrier|) (= (select (select (store |c_old(#memory_$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_1)) |c_dll_circular_append_#in~head.base|) |c_dll_circular_append_#in~head.offset|) 0))) is different from true [2021-11-09 09:23:57,043 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2021-11-09 09:23:57,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996493479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:23:57,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:23:57,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 33 [2021-11-09 09:23:57,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929014321] [2021-11-09 09:23:57,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-09 09:23:57,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:23:57,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-09 09:23:57,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=779, Unknown=8, NotChecked=174, Total=1056 [2021-11-09 09:23:57,046 INFO L87 Difference]: Start difference. First operand 120 states and 127 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) [2021-11-09 09:24:23,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:24:23,798 INFO L93 Difference]: Finished difference Result 134 states and 140 transitions. [2021-11-09 09:24:23,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-09 09:24:23,799 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 [2021-11-09 09:24:23,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:24:23,800 INFO L225 Difference]: With dead ends: 134 [2021-11-09 09:24:23,801 INFO L226 Difference]: Without dead ends: 129 [2021-11-09 09:24:23,802 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 39.3s TimeCoverageRelationStatistics Valid=179, Invalid=1627, Unknown=12, NotChecked=252, Total=2070 [2021-11-09 09:24:23,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-09 09:24:23,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 110. [2021-11-09 09:24:23,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 95 states have internal predecessors, (100), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:24:23,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 115 transitions. [2021-11-09 09:24:23,806 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 115 transitions. Word has length 64 [2021-11-09 09:24:23,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:24:23,806 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 115 transitions. [2021-11-09 09:24:23,806 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) [2021-11-09 09:24:23,807 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 115 transitions. [2021-11-09 09:24:23,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-09 09:24:23,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:24:23,808 INFO L513 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] [2021-11-09 09:24:23,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-09 09:24:24,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-09 09:24:24,027 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting mainErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:24:24,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:24:24,028 INFO L85 PathProgramCache]: Analyzing trace with hash -2120302745, now seen corresponding path program 1 times [2021-11-09 09:24:24,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:24:24,028 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919349170] [2021-11-09 09:24:24,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:24:24,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:24:24,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:24:24,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:24:24,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:24:24,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:24:24,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-09 09:24:24,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:24:24,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:24,432 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 09:24:24,432 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:24:24,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919349170] [2021-11-09 09:24:24,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919349170] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:24:24,433 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:24:24,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:24:24,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435834789] [2021-11-09 09:24:24,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:24:24,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:24:24,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:24:24,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:24:24,436 INFO L87 Difference]: Start difference. First operand 110 states and 115 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) [2021-11-09 09:24:25,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:24:25,420 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2021-11-09 09:24:25,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-09 09:24:25,421 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 [2021-11-09 09:24:25,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:24:25,425 INFO L225 Difference]: With dead ends: 132 [2021-11-09 09:24:25,425 INFO L226 Difference]: Without dead ends: 132 [2021-11-09 09:24:25,425 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:24:25,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-09 09:24:25,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 111. [2021-11-09 09:24:25,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 78 states have (on average 1.3076923076923077) internal successors, (102), 96 states have internal predecessors, (102), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:24:25,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 117 transitions. [2021-11-09 09:24:25,431 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 117 transitions. Word has length 70 [2021-11-09 09:24:25,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:24:25,431 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 117 transitions. [2021-11-09 09:24:25,432 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) [2021-11-09 09:24:25,432 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 117 transitions. [2021-11-09 09:24:25,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-09 09:24:25,433 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:24:25,433 INFO L513 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] [2021-11-09 09:24:25,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-09 09:24:25,434 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting mainErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 61 more)] === [2021-11-09 09:24:25,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:24:25,434 INFO L85 PathProgramCache]: Analyzing trace with hash -2120302744, now seen corresponding path program 1 times [2021-11-09 09:24:25,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:24:25,435 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545101155] [2021-11-09 09:24:25,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:24:25,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:24:25,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:25,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:24:25,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:25,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:24:25,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:26,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:24:26,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:26,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:24:26,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:26,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-09 09:24:26,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:29,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:24:29,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:31,384 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:24:31,384 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:24:31,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545101155] [2021-11-09 09:24:31,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545101155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:24:31,384 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103557438] [2021-11-09 09:24:31,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:24:31,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:24:31,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:24:31,386 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:24:31,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81503d24-b866-4d2f-a459-09e01c554b0f/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-09 09:24:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:24:32,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-09 09:24:32,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:24:32,131 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 [2021-11-09 09:24:32,210 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 [2021-11-09 09:24:32,585 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 [2021-11-09 09:24:32,595 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 [2021-11-09 09:24:33,378 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 [2021-11-09 09:24:33,648 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-09 09:24:33,648 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 [2021-11-09 09:24:33,932 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-09 09:24:33,933 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 48 treesize of output 31 [2021-11-09 09:24:33,938 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 24 treesize of output 20 [2021-11-09 09:24:33,942 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 14 treesize of output 12 [2021-11-09 09:24:33,946 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